// === LESSON 30: FOOTBALL OR POLO? ===
// English learning story with Chinese translation - Intermediate Level

window.ContentModules = window.ContentModules || {};

window.ContentModules.NCE2Lesson30 = {
    id: "nce2-lesson30",
    name: "NCE2-Lesson30",
    description: "Football or polo? - A story about the Wayle river with grammar focus on articles and quantifiers",
    difficulty: "intermediate",
    language: "en-US",
    userLanguage: "zh-CN",
    totalWords: 200,

    // === GRAMMAR LESSONS SYSTEM ===
    grammar: {
        "articles-usage": {
            title: "Articles Usage - 冠词使用",
            explanation: "English uses 'a', 'an', and 'the' in specific ways, especially with names and places.",
            rules: [
                "the - use with rivers, seas, oceans, mountain ranges: the Thames, the Pacific",
                "no article - use with most personal names and countries: John, England",
                "the - use with certain countries: the United States, the United Kingdom",
                "the - use with superlatives and unique things: the best, the sun"
            ],
            examples: [
                {
                    english: "The Wayle is a small river.",
                    chinese: "威尔河是一条小河。",
                    explanation: "Use 'the' with river names",
                    pronunciation: "ðə weɪl ɪz ə smɔːl ˈrɪvər"
                },
                {
                    english: "Paris is on the Seine.",
                    chinese: "巴黎在塞纳河上。",
                    explanation: "Use 'the' with famous rivers",
                    pronunciation: "ˈpærɪs ɪz ɒn ðə seɪn"
                },
                {
                    english: "London is on the Thames.",
                    chinese: "伦敦在泰晤士河上。",
                    explanation: "River names always take 'the'",
                    pronunciation: "ˈlʌndən ɪz ɒn ðə temz"
                },
                {
                    english: "He lives in England.",
                    chinese: "他住在英国。",
                    explanation: "Most country names don't use 'the'",
                    pronunciation: "hiː lɪvz ɪn ˈɪŋɡlənd"
                },
                {
                    english: "I went to the United States.",
                    chinese: "我去了美国。",
                    explanation: "Some countries use 'the'",
                    pronunciation: "aɪ went tuː ðə juˈnaɪtɪd steɪts"
                }
            ],
            exercises: [
                {
                    type: "fill_blank",
                    sentence: "_____ Thames flows through London.",
                    options: ["The", "A", "An", "No article"],
                    correct: "The",
                    explanation: "River names always use 'the'"
                },
                {
                    type: "fill_blank", 
                    sentence: "John lives in _____ England.",
                    options: ["the", "a", "an", "no article"],
                    correct: "no article",
                    explanation: "Most country names don't use articles"
                }
            ]
        },

        "some-any-usage": {
            title: "Some and Any Usage - Some和Any的使用",
            explanation: "English uses 'some' and 'any' differently depending on sentence type and meaning.",
            rules: [
                "some - use in positive statements: There are some people",
                "any - use in questions: Are there any people?",
                "any - use in negative statements: There aren't any people", 
                "some - use in offers and requests: Would you like some tea?"
            ],
            examples: [
                {
                    english: "Some children were playing games.",
                    chinese: "一些孩子在玩游戏。",
                    explanation: "Use 'some' in positive statements",
                    pronunciation: "sʌm ˈtʃɪldrən wər ˈpleɪɪŋ ɡeɪmz"
                },
                {
                    english: "There were some people rowing.",
                    chinese: "有一些人在划船。",
                    explanation: "Use 'some' to describe what exists",
                    pronunciation: "ðər wər sʌm ˈpiːpəl ˈroʊɪŋ"
                },
                {
                    english: "There weren't any children in sight.",
                    chinese: "看不见任何孩子。",
                    explanation: "Use 'any' in negative statements",
                    pronunciation: "ðər wərnt ˈeni ˈtʃɪldrən ɪn saɪt"
                },
                {
                    english: "Are there any boats on the river?",
                    chinese: "河上有船吗？",
                    explanation: "Use 'any' in questions",
                    pronunciation: "ər ðər ˈeni boʊts ɒn ðə ˈrɪvər"
                },
                {
                    english: "Would you like some water?",
                    chinese: "你想要一些水吗？",
                    explanation: "Use 'some' in offers",
                    pronunciation: "wʊd juː laɪk sʌm ˈwɔːtər"
                }
            ],
            exercises: [
                {
                    type: "fill_blank",
                    sentence: "There are _____ people on the bank.",
                    options: ["some", "any", "a", "the"],
                    correct: "some",
                    explanation: "Use 'some' in positive statements"
                },
                {
                    type: "fill_blank",
                    sentence: "There weren't _____ children in sight.",
                    options: ["some", "any", "a", "the"],
                    correct: "any",
                    explanation: "Use 'any' in negative statements"
                }
            ]
        },

        "past-continuous": {
            title: "Past Continuous Tense - 过去进行时",
            explanation: "Use past continuous for actions that were in progress at a specific time in the past.",
            rules: [
                "Form: was/were + verb-ing",
                "Use for ongoing past actions: I was sitting by the river",
                "Use for background actions in stories: Children were playing while I sat",
                "Use with time expressions: at 3pm yesterday, last Sunday"
            ],
            examples: [
                {
                    english: "Some children were playing games.",
                    chinese: "一些孩子在玩游戏。",
                    explanation: "Action in progress in the past",
                    pronunciation: "sʌm ˈtʃɪldrən wər ˈpleɪɪŋ ɡeɪmz"
                },
                {
                    english: "People were rowing on the river.",
                    chinese: "人们在河上划船。",
                    explanation: "Ongoing action in the past",
                    pronunciation: "ˈpiːpəl wər ˈroʊɪŋ ɒn ðə ˈrɪvər"
                },
                {
                    english: "I was sitting by the river.",
                    chinese: "我坐在河边。",
                    explanation: "Past continuous shows duration",
                    pronunciation: "aɪ wəz ˈsɪtɪŋ baɪ ðə ˈrɪvər"
                }
            ],
            exercises: [
                {
                    type: "fill_blank",
                    sentence: "The children _____ playing when it happened.",
                    options: ["were", "was", "are", "is"],
                    correct: "were",
                    explanation: "Use 'were' with plural subjects in past continuous"
                }
            ]
        }
    },

    vocabulary: {
        "polo": {
            "user_language": "水球",
            "type": "noun",
            "pronunciation": "ˈpoʊloʊ"
        },
        "river": {
            "user_language": "河流",
            "type": "noun", 
            "pronunciation": "ˈrɪvər"
        },
        "cut": {
            "user_language": "穿过",
            "type": "verb",
            "pronunciation": "kʌt"
        },
        "park": {
            "user_language": "公园",
            "type": "noun",
            "pronunciation": "pɑːrk"
        },
        "afternoon": {
            "user_language": "下午",
            "type": "noun",
            "pronunciation": "ˌæftərˈnuːn"
        },
        "bank": {
            "user_language": "河岸",
            "type": "noun",
            "pronunciation": "bæŋk"
        },
        "usual": {
            "user_language": "平常的",
            "type": "adjective",
            "pronunciation": "ˈjuːʒuəl"
        },
        "children": {
            "user_language": "孩子们",
            "type": "noun",
            "pronunciation": "ˈtʃɪldrən"
        },
        "games": {
            "user_language": "游戏",
            "type": "noun",
            "pronunciation": "ɡeɪmz"
        },
        "people": {
            "user_language": "人们",
            "type": "noun",
            "pronunciation": "ˈpiːpəl"
        },
        "row": {
            "user_language": "划船",
            "type": "verb",
            "pronunciation": "roʊ"
        },
        "suddenly": {
            "user_language": "突然",
            "type": "adverb",
            "pronunciation": "ˈsʌdənli"
        },
        "kick": {
            "user_language": "踢",
            "type": "verb",
            "pronunciation": "kɪk"
        },
        "ball": {
            "user_language": "球",
            "type": "noun",
            "pronunciation": "bɔːl"
        },
        "hard": {
            "user_language": "用力地",
            "type": "adverb",
            "pronunciation": "hɑːrd"
        },
        "towards": {
            "user_language": "朝向",
            "type": "preposition",
            "pronunciation": "təˈwɔːrdz"
        },
        "passing": {
            "user_language": "经过的",
            "type": "adjective",
            "pronunciation": "ˈpæsɪŋ"
        },
        "boat": {
            "user_language": "船",
            "type": "noun",
            "pronunciation": "boʊt"
        },
        "called": {
            "user_language": "叫喊",
            "type": "verb",
            "pronunciation": "kɔːld"
        },
        "hear": {
            "user_language": "听见",
            "type": "verb",
            "pronunciation": "hɪr"
        },
        "struck": {
            "user_language": "击打",
            "type": "verb",
            "pronunciation": "strʌk"
        },
        "nearly": {
            "user_language": "几乎",
            "type": "adverb",
            "pronunciation": "ˈnɪrli"
        },
        "fell": {
            "user_language": "落下",
            "type": "verb",
            "pronunciation": "fel"
        },
        "water": {
            "user_language": "水",
            "type": "noun",
            "pronunciation": "ˈwɔːtər"
        },
        "turned": {
            "user_language": "转身",
            "type": "verb",
            "pronunciation": "tɜːrnd"
        },
        "sight": {
            "user_language": "视线",
            "type": "noun",
            "pronunciation": "saɪt"
        },
        "run away": {
            "user_language": "跑开",
            "type": "verb",
            "pronunciation": "rʌn əˈweɪ"
        },
        "laughed": {
            "user_language": "笑",
            "type": "verb",
            "pronunciation": "læft"
        },
        "realized": {
            "user_language": "意识到",
            "type": "verb",
            "pronunciation": "ˈriəlaɪzd"
        },
        "happened": {
            "user_language": "发生",
            "type": "verb",
            "pronunciation": "ˈhæpənd"
        },
        "threw": {
            "user_language": "扔",
            "type": "verb",
            "pronunciation": "θruː"
        },
        "back": {
            "user_language": "回来",
            "type": "adverb",
            "pronunciation": "bæk"
        }
    },

    // === SENTENCES FOR GAMES (extracted from stories) ===
    sentences: [
        {
            english: "The Wayle is a small river.",
            chinese: "威尔河是一条小河。",
            prononciation: "ðə weɪl ɪz ə smɔːl ˈrɪvər"
        },
        {
            english: "It cuts across the park near my home.",
            chinese: "它横穿我家附近的公园。",
            prononciation: "ɪt kʌts əˈkrɔːs ðə pɑːrk nɪr maɪ hoʊm"
        },
        {
            english: "I like sitting by the Wayle on fine afternoons.",
            chinese: "我喜欢在晴朗的下午坐在威尔河边。",
            prononciation: "aɪ laɪk ˈsɪtɪŋ baɪ ðə weɪl ɑːn faɪn ˌæftərˈnuːnz"
        },
        {
            english: "Some children were playing games on the bank.",
            chinese: "一些孩子在河岸上玩游戏。",
            prononciation: "sʌm ˈtʃɪldrən wər ˈpleɪɪŋ geɪmz ɑːn ðə bæŋk"
        },
        {
            english: "There were some people rowing on the river.",
            chinese: "河上有一些人在划船。",
            prononciation: "ðɛr wər sʌm ˈpiːpəl ˈroʊɪŋ ɑːn ðə ˈrɪvər"
        },
        {
            english: "The ball struck him so hard.",
            chinese: "球重重地打在他身上。",
            prononciation: "ðə bɔːl strʌk hɪm soʊ hɑːrd"
        },
        {
            english: "This is a pleasant surprise!",
            chinese: "这真是个意外的惊喜！",
            prononciation: "ðɪs ɪz ə ˈplɛzənt sərˈpraɪz"
        },
        {
            english: "I turned to look at the children.",
            chinese: "我转身看向孩子们。",
            prononciation: "aɪ tɜːrnd tuː lʊk æt ðə ˈtʃɪldrən"
        },
        {
            english: "They were playing football, not polo!",
            chinese: "他们在踢足球，不是水球！",
            prononciation: "ðeɪ wər ˈpleɪɪŋ ˈfʊtbɔːl nɑːt ˈpoʊloʊ"
        }
    ],

    story: {
        title: "Football or polo? - 足球还是水球？",
        totalSentences: 12,
        chapters: [
            {
                title: "Chapter 1: A Day by the River - 河边的一天",
                sentences: [
                    {
                        id: 1,
                        original: "The Wayle is a small river that cuts across the park near my home.",
                        translation: "威尔河是横穿我家附近公园的一条小河。",
                        words: [
                            {word: "The", translation: "这条", type: "article", pronunciation: "ðə"},
                            {word: "Wayle", translation: "威尔河", type: "noun", pronunciation: "weɪl"},
                            {word: "is", translation: "是", type: "verb", pronunciation: "ɪz"},
                            {word: "a", translation: "一条", type: "article", pronunciation: "ə"},
                            {word: "small", translation: "小的", type: "adjective", pronunciation: "smɔːl"},
                            {word: "river", translation: "河流", type: "noun", pronunciation: "ˈrɪvər"},
                            {word: "that", translation: "那", type: "pronoun", pronunciation: "ðæt"},
                            {word: "cuts", translation: "穿过", type: "verb", pronunciation: "kʌts"},
                            {word: "across", translation: "横穿", type: "preposition", pronunciation: "əˈkrɔːs"},
                            {word: "the", translation: "这个", type: "article", pronunciation: "ðə"},
                            {word: "park", translation: "公园", type: "noun", pronunciation: "pɑːrk"},
                            {word: "near", translation: "靠近", type: "preposition", pronunciation: "nɪr"},
                            {word: "my", translation: "我的", type: "pronoun", pronunciation: "maɪ"},
                            {word: "home", translation: "家", type: "noun", pronunciation: "hoʊm"}
                        ]
                    },
                    {
                        id: 2,
                        original: "I like sitting by the Wayle on fine afternoons.",
                        translation: "我喜欢在天气晴朗的下午坐在威尔河边。",
                        words: [
                            {word: "I", translation: "我", type: "pronoun", pronunciation: "aɪ"},
                            {word: "like", translation: "喜欢", type: "verb", pronunciation: "laɪk"},
                            {word: "sitting", translation: "坐", type: "verb", pronunciation: "ˈsɪtɪŋ"},
                            {word: "by", translation: "在...旁边", type: "preposition", pronunciation: "baɪ"},
                            {word: "the", translation: "这条", type: "article", pronunciation: "ðə"},
                            {word: "Wayle", translation: "威尔河", type: "noun", pronunciation: "weɪl"},
                            {word: "on", translation: "在", type: "preposition", pronunciation: "ɒn"},
                            {word: "fine", translation: "晴朗的", type: "adjective", pronunciation: "faɪn"},
                            {word: "afternoons", translation: "下午", type: "noun", pronunciation: "ˌæftərˈnuːnz"}
                        ]
                    },
                    {
                        id: 3,
                        original: "It was warm last Sunday, so I went and sat on the river bank as usual.",
                        translation: "上星期日天气很暖和，于是我像往常一样又去河边坐坐。",
                        words: [
                            {word: "It", translation: "天气", type: "pronoun", pronunciation: "ɪt"},
                            {word: "was", translation: "是", type: "verb", pronunciation: "wəz"},
                            {word: "warm", translation: "暖和的", type: "adjective", pronunciation: "wɔːrm"},
                            {word: "last", translation: "上", type: "adjective", pronunciation: "læst"},
                            {word: "Sunday", translation: "星期日", type: "noun", pronunciation: "ˈsʌndeɪ"},
                            {word: "so", translation: "所以", type: "conjunction", pronunciation: "soʊ"},
                            {word: "I", translation: "我", type: "pronoun", pronunciation: "aɪ"},
                            {word: "went", translation: "去了", type: "verb", pronunciation: "went"},
                            {word: "and", translation: "和", type: "conjunction", pronunciation: "ænd"},
                            {word: "sat", translation: "坐", type: "verb", pronunciation: "sæt"},
                            {word: "on", translation: "在", type: "preposition", pronunciation: "ɒn"},
                            {word: "the", translation: "这个", type: "article", pronunciation: "ðə"},
                            {word: "river", translation: "河", type: "noun", pronunciation: "ˈrɪvər"},
                            {word: "bank", translation: "岸边", type: "noun", pronunciation: "bæŋk"},
                            {word: "as", translation: "像", type: "adverb", pronunciation: "æz"},
                            {word: "usual", translation: "往常一样", type: "adjective", pronunciation: "ˈjuːʒuəl"}
                        ]
                    },
                    {
                        id: 4,
                        original: "Some children were playing games on the bank and there were some people rowing on the river.",
                        translation: "河岸上有些孩子在玩耍，河面上有些人在划船。",
                        words: [
                            {word: "Some", translation: "一些", type: "determiner", pronunciation: "sʌm"},
                            {word: "children", translation: "孩子们", type: "noun", pronunciation: "ˈtʃɪldrən"},
                            {word: "were", translation: "正在", type: "verb", pronunciation: "wər"},
                            {word: "playing", translation: "玩", type: "verb", pronunciation: "ˈpleɪɪŋ"},
                            {word: "games", translation: "游戏", type: "noun", pronunciation: "ɡeɪmz"},
                            {word: "on", translation: "在", type: "preposition", pronunciation: "ɒn"},
                            {word: "the", translation: "这个", type: "article", pronunciation: "ðə"},
                            {word: "bank", translation: "岸边", type: "noun", pronunciation: "bæŋk"},
                            {word: "and", translation: "和", type: "conjunction", pronunciation: "ænd"},
                            {word: "there", translation: "那里", type: "adverb", pronunciation: "ðer"},
                            {word: "were", translation: "有", type: "verb", pronunciation: "wər"},
                            {word: "some", translation: "一些", type: "determiner", pronunciation: "sʌm"},
                            {word: "people", translation: "人们", type: "noun", pronunciation: "ˈpiːpəl"},
                            {word: "rowing", translation: "划船", type: "verb", pronunciation: "ˈroʊɪŋ"},
                            {word: "on", translation: "在", type: "preposition", pronunciation: "ɒn"},
                            {word: "the", translation: "这条", type: "article", pronunciation: "ðə"},
                            {word: "river", translation: "河", type: "noun", pronunciation: "ˈrɪvər"}
                        ]
                    }
                ]
            },
            {
                title: "Chapter 2: The Ball Incident - 球的事件",
                sentences: [
                    {
                        id: 5,
                        original: "Suddenly, one of the children kicked a ball very hard and it went towards a passing boat.",
                        translation: "突然，一个孩子狠狠地踢了一脚球，球便向一条经过的小船飞去。",
                        words: [
                            {word: "Suddenly", translation: "突然", type: "adverb", pronunciation: "ˈsʌdənli"},
                            {word: "one", translation: "一个", type: "number", pronunciation: "wʌn"},
                            {word: "of", translation: "的", type: "preposition", pronunciation: "ʌv"},
                            {word: "the", translation: "这些", type: "article", pronunciation: "ðə"},
                            {word: "children", translation: "孩子们", type: "noun", pronunciation: "ˈtʃɪldrən"},
                            {word: "kicked", translation: "踢了", type: "verb", pronunciation: "kɪkt"},
                            {word: "a", translation: "一个", type: "article", pronunciation: "ə"},
                            {word: "ball", translation: "球", type: "noun", pronunciation: "bɔːl"},
                            {word: "very", translation: "非常", type: "adverb", pronunciation: "ˈveri"},
                            {word: "hard", translation: "用力地", type: "adverb", pronunciation: "hɑːrd"},
                            {word: "and", translation: "并且", type: "conjunction", pronunciation: "ænd"},
                            {word: "it", translation: "它", type: "pronoun", pronunciation: "ɪt"},
                            {word: "went", translation: "飞去", type: "verb", pronunciation: "went"},
                            {word: "towards", translation: "朝向", type: "preposition", pronunciation: "təˈwɔːrdz"},
                            {word: "a", translation: "一条", type: "article", pronunciation: "ə"},
                            {word: "passing", translation: "经过的", type: "adjective", pronunciation: "ˈpæsɪŋ"},
                            {word: "boat", translation: "船", type: "noun", pronunciation: "boʊt"}
                        ]
                    },
                    {
                        id: 6,
                        original: "Some people on the bank called out to the man in the boat, but he did not hear them.",
                        translation: "岸上的一些人对船上的人高喊，但他没有听见。",
                        words: [
                            {word: "Some", translation: "一些", type: "determiner", pronunciation: "sʌm"},
                            {word: "people", translation: "人们", type: "noun", pronunciation: "ˈpiːpəl"},
                            {word: "on", translation: "在", type: "preposition", pronunciation: "ɒn"},
                            {word: "the", translation: "这个", type: "article", pronunciation: "ðə"},
                            {word: "bank", translation: "岸上", type: "noun", pronunciation: "bæŋk"},
                            {word: "called", translation: "叫喊", type: "verb", pronunciation: "kɔːld"},
                            {word: "out", translation: "出来", type: "adverb", pronunciation: "aʊt"},
                            {word: "to", translation: "对", type: "preposition", pronunciation: "tuː"},
                            {word: "the", translation: "这个", type: "article", pronunciation: "ðə"},
                            {word: "man", translation: "人", type: "noun", pronunciation: "mæn"},
                            {word: "in", translation: "在", type: "preposition", pronunciation: "ɪn"},
                            {word: "the", translation: "这条", type: "article", pronunciation: "ðə"},
                            {word: "boat", translation: "船上", type: "noun", pronunciation: "boʊt"},
                            {word: "but", translation: "但是", type: "conjunction", pronunciation: "bʌt"},
                            {word: "he", translation: "他", type: "pronoun", pronunciation: "hiː"},
                            {word: "did", translation: "助动词", type: "auxiliary", pronunciation: "dɪd"},
                            {word: "not", translation: "不", type: "adverb", pronunciation: "nɑːt"},
                            {word: "hear", translation: "听见", type: "verb", pronunciation: "hɪr"},
                            {word: "them", translation: "他们", type: "pronoun", pronunciation: "ðem"}
                        ]
                    },
                    {
                        id: 7,
                        original: "The ball struck him so hard that he nearly fell into the water.",
                        translation: "球重重地打在他身上，使他差点儿落入水中。",
                        words: [
                            {word: "The", translation: "这个", type: "article", pronunciation: "ðə"},
                            {word: "ball", translation: "球", type: "noun", pronunciation: "bɔːl"},
                            {word: "struck", translation: "击打", type: "verb", pronunciation: "strʌk"},
                            {word: "him", translation: "他", type: "pronoun", pronunciation: "hɪm"},
                            {word: "so", translation: "如此", type: "adverb", pronunciation: "soʊ"},
                            {word: "hard", translation: "用力", type: "adverb", pronunciation: "hɑːrd"},
                            {word: "that", translation: "以至于", type: "conjunction", pronunciation: "ðæt"},
                            {word: "he", translation: "他", type: "pronoun", pronunciation: "hiː"},
                            {word: "nearly", translation: "几乎", type: "adverb", pronunciation: "ˈnɪrli"},
                            {word: "fell", translation: "落下", type: "verb", pronunciation: "fel"},
                            {word: "into", translation: "进入", type: "preposition", pronunciation: "ˈɪntuː"},
                            {word: "the", translation: "这", type: "article", pronunciation: "ðə"},
                            {word: "water", translation: "水中", type: "noun", pronunciation: "ˈwɔːtər"}
                        ]
                    },
                    {
                        id: 8,
                        original: "I turned to look at the children, but there weren't any in sight: they had all run away!",
                        translation: "我转过头去看那些孩子，但一个也不见，全都跑了！",
                        words: [
                            {word: "I", translation: "我", type: "pronoun", pronunciation: "aɪ"},
                            {word: "turned", translation: "转身", type: "verb", pronunciation: "tɜːrnd"},
                            {word: "to", translation: "去", type: "preposition", pronunciation: "tuː"},
                            {word: "look", translation: "看", type: "verb", pronunciation: "lʊk"},
                            {word: "at", translation: "看", type: "preposition", pronunciation: "æt"},
                            {word: "the", translation: "这些", type: "article", pronunciation: "ðə"},
                            {word: "children", translation: "孩子们", type: "noun", pronunciation: "ˈtʃɪldrən"},
                            {word: "but", translation: "但是", type: "conjunction", pronunciation: "bʌt"},
                            {word: "there", translation: "那里", type: "adverb", pronunciation: "ðer"},
                            {word: "weren't", translation: "没有", type: "verb", pronunciation: "wərnt"},
                            {word: "any", translation: "任何", type: "determiner", pronunciation: "ˈeni"},
                            {word: "in", translation: "在", type: "preposition", pronunciation: "ɪn"},
                            {word: "sight", translation: "视线中", type: "noun", pronunciation: "saɪt"},
                            {word: "they", translation: "他们", type: "pronoun", pronunciation: "ðeɪ"},
                            {word: "had", translation: "已经", type: "auxiliary", pronunciation: "hæd"},
                            {word: "all", translation: "全部", type: "adverb", pronunciation: "ɔːl"},
                            {word: "run", translation: "跑", type: "verb", pronunciation: "rʌn"},
                            {word: "away", translation: "走了", type: "adverb", pronunciation: "əˈweɪ"}
                        ]
                    }
                ]
            },
            {
                title: "Chapter 3: The Happy Ending - 愉快的结局",
                sentences: [
                    {
                        id: 9,
                        original: "The man laughed when he realized what had happened.",
                        translation: "当那个人明白了发生的事情时，笑了。",
                        words: [
                            {word: "The", translation: "这个", type: "article", pronunciation: "ðə"},
                            {word: "man", translation: "人", type: "noun", pronunciation: "mæn"},
                            {word: "laughed", translation: "笑了", type: "verb", pronunciation: "læft"},
                            {word: "when", translation: "当", type: "conjunction", pronunciation: "wen"},
                            {word: "he", translation: "他", type: "pronoun", pronunciation: "hiː"},
                            {word: "realized", translation: "意识到", type: "verb", pronunciation: "ˈriəlaɪzd"},
                            {word: "what", translation: "什么", type: "pronoun", pronunciation: "wʌt"},
                            {word: "had", translation: "已经", type: "auxiliary", pronunciation: "hæd"},
                            {word: "happened", translation: "发生了", type: "verb", pronunciation: "ˈhæpənd"}
                        ]
                    },
                    {
                        id: 10,
                        original: "He called out to the children and threw the ball back to the bank.",
                        translation: "他大声叫那些孩子，把球扔回到岸上。",
                        words: [
                            {word: "He", translation: "他", type: "pronoun", pronunciation: "hiː"},
                            {word: "called", translation: "叫", type: "verb", pronunciation: "kɔːld"},
                            {word: "out", translation: "出来", type: "adverb", pronunciation: "aʊt"},
                            {word: "to", translation: "对", type: "preposition", pronunciation: "tuː"},
                            {word: "the", translation: "这些", type: "article", pronunciation: "ðə"},
                            {word: "children", translation: "孩子们", type: "noun", pronunciation: "ˈtʃɪldrən"},
                            {word: "and", translation: "并且", type: "conjunction", pronunciation: "ænd"},
                            {word: "threw", translation: "扔", type: "verb", pronunciation: "θruː"},
                            {word: "the", translation: "这个", type: "article", pronunciation: "ðə"},
                            {word: "ball", translation: "球", type: "noun", pronunciation: "bɔːl"},
                            {word: "back", translation: "回", type: "adverb", pronunciation: "bæk"},
                            {word: "to", translation: "到", type: "preposition", pronunciation: "tuː"},
                            {word: "the", translation: "这个", type: "article", pronunciation: "ðə"},
                            {word: "bank", translation: "岸上", type: "noun", pronunciation: "bæŋk"}
                        ]
                    }
                ]
            }
        ]
    },

    // === GRAMMAR-BASED FILL IN THE BLANKS ===
    fillInBlanks: [
        {
            sentence: "_____ Wayle is a small river.",
            options: ["The", "A", "An", "No article"],
            correctAnswer: "The",
            explanation: "River names always use 'the'",
            grammarFocus: "articles-usage"
        },
        {
            sentence: "There were _____ people rowing on the river.",
            options: ["some", "any", "a", "the"],
            correctAnswer: "some",
            explanation: "Use 'some' in positive statements",
            grammarFocus: "some-any-usage"
        },
        {
            sentence: "There weren't _____ children in sight.",
            options: ["some", "any", "a", "the"],
            correctAnswer: "any",
            explanation: "Use 'any' in negative statements",
            grammarFocus: "some-any-usage"
        },
        {
            sentence: "The children _____ playing games on the bank.",
            options: ["were", "was", "are", "is"],
            correctAnswer: "were",
            explanation: "Use 'were' with plural subjects in past continuous",
            grammarFocus: "past-continuous"
        },
        {
            sentence: "He lives in _____ England.",
            options: ["the", "a", "an", "no article"],
            correctAnswer: "no article",
            explanation: "Most country names don't use articles",
            grammarFocus: "articles-usage"
        },
        {
            sentence: "Are there _____ boats on the river?",
            options: ["some", "any", "a", "the"],
            correctAnswer: "any",
            explanation: "Use 'any' in questions",
            grammarFocus: "some-any-usage"
        }
    ],

    // === GRAMMAR CORRECTION EXERCISES ===
    corrections: [
        {
            incorrect: "Wayle is small river.",
            correct: "The Wayle is a small river.",
            explanation: "River names need 'the' and countable nouns need 'a'",
            grammarFocus: "articles-usage"
        },
        {
            incorrect: "There were any children playing.",
            correct: "There were some children playing.",
            explanation: "Use 'some' in positive statements, not 'any'",
            grammarFocus: "some-any-usage"
        },
        {
            incorrect: "There wasn't some people in sight.",
            correct: "There weren't any people in sight.",
            explanation: "Use 'any' in negative statements, not 'some'",
            grammarFocus: "some-any-usage"
        },
        {
            incorrect: "He goes to United States.",
            correct: "He goes to the United States.",
            explanation: "Some countries like 'the United States' require 'the'",
            grammarFocus: "articles-usage"
        }
    ],

    // === COMPREHENSION QUESTIONS ===
    comprehension: [
        {
            question: "Where does the writer like to sit?",
            options: [
                "In the park",
                "By the Wayle river", 
                "On the boat",
                "In his garden"
            ],
            correct: "By the Wayle river",
            explanation: "The writer says 'I like sitting by the Wayle on fine afternoons'"
        },
        {
            question: "What were the children doing?",
            options: [
                "Swimming in the river",
                "Playing games on the bank",
                "Rowing on the river", 
                "Sitting by the water"
            ],
            correct: "Playing games on the bank",
            explanation: "The text states 'Some children were playing games on the bank'"
        },
        {
            question: "Why didn't the man in the boat hear the people calling?",
            options: [
                "He was deaf",
                "The text doesn't say why",
                "He was sleeping",
                "The water was too loud"
            ],
            correct: "The text doesn't say why",
            explanation: "The text only says 'he did not hear them' but doesn't give a reason"
        },
        {
            question: "What happened after the ball hit the man?",
            options: [
                "He fell into the water",
                "He got angry with the children",
                "The children ran away",
                "He threw the ball at the children"
            ],
            correct: "The children ran away",
            explanation: "The text says 'there weren't any in sight: they had all run away!'"
        },
        {
            question: "How did the story end?",
            options: [
                "The man was angry",
                "The man called police",
                "The man laughed and threw the ball back",
                "The children came back"
            ],
            correct: "The man laughed and threw the ball back",
            explanation: "The text ends with 'The man laughed... threw the ball back to the bank'"
        }
    ]
};

// ============================================================================
// CONTENT STRUCTURE SUMMARY - FOR AI REFERENCE  
// ============================================================================
//
// This module represents INTERMEDIATE level English learning content for Chinese speakers:
// - Focus on past tense narrative and descriptive language
// - Grammar emphasis on articles (the/a/an) and quantifiers (some/any)
// - Rich vocabulary around outdoor activities and everyday situations
// - Complex sentence structures with subordinate clauses
// - Cultural context of British/Western recreational activities
//
// LEARNING OBJECTIVES:
// - Master use of definite/indefinite articles with different noun types
// - Understand some/any usage in different sentence types  
// - Practice past continuous vs simple past tense
// - Build vocabulary around outdoor activities and emotions
// - Develop reading comprehension of narrative texts
//
// DIFFICULTY INDICATORS:
// - Longer sentences with multiple clauses
// - Past perfect and continuous tenses
// - Abstract concepts (realization, consequences)
// - Cultural references (British countryside, recreational activities)
// - Advanced vocabulary (struck, realized, rowing, etc.)
//
// ============================================================================