{
  "id": "sbs-fusion",
  "name": "Side by Side Fusion",
  "description": "Side by Side Fusion Edition - Mixed-level chapters designed for combined beginner classes with differentiated learning paths",
  "difficulty": "beginner-mixed",
  "language": "en-US",
  "metadata": {
    "version": "1.0",
    "created": "2025-11-02",
    "updated": "2025-11-02",
    "source": "Side by Side English Learning Series - Fusion Edition",
    "target_level": "beginner-mixed",
    "total_estimated_hours": 4,
    "prerequisites": ["sbs-1"],
    "learning_objectives": [
      "Enable mixed-level classes to learn together effectively",
      "Apply differentiated instruction principles",
      "Practice collaborative learning across levels",
      "Master content adapted to individual student levels"
    ],
    "content_tags": ["mixed-level", "differentiated", "collaborative", "beginner", "fusion"],
    "total_chapters": 3,
    "available_chapters": ["2-9", "3-8", "3-10"],
    "completion_criteria": {
      "overall_progress": 75,
      "chapters_completed": 1,
      "vocabulary_mastery": 75
    }
  },
  "chapters": [
    {
      "id": "sbs-2-9-fusion",
      "chapter_number": "2-9",
      "name": "People, Places & Daily Activities (Fusion SBS2+9)",
      "description": "Mixed-level chapter combining SBS2 locations with SBS9 daily activities - designed for combined beginner classes",
      "estimated_hours": 2,
      "difficulty": "beginner-mixed",
      "prerequisites": ["sbs-1"],
      "learning_objectives": [
        "SBS2: Master location vocabulary with Where questions",
        "SBS9: Practice simple present tense with daily activities",
        "Both: Learn to describe people's locations and activities",
        "Both: Practice collaborative communication across levels"
      ],
      "vocabulary_count": 31,
      "phrases_count": 11,
      "dialogs_count": 3,
      "exercises_count": 5,
      "target_levels": {
        "sbs2": {
          "focus": "Simple phrases + complex vocabulary",
          "grammar": "Where questions, to be (is/are), prepositions (at/in)",
          "principle": "Simple sentence structure with advanced vocabulary (professions, specific locations)"
        },
        "sbs9": {
          "focus": "Complex phrases + simple vocabulary",
          "grammar": "Simple present tense, do/does questions, third person -s/-es",
          "principle": "Complex sentence structures with basic verbs (work, help, teach)"
        }
      }
    },
    {
      "id": "sbs-3-8-fusion",
      "chapter_number": "3-8",
      "name": "What People Are Wearing (Fusion SBS3+8)",
      "description": "Mixed-level chapter combining SBS3 present continuous with SBS8 clothing vocabulary - designed for combined beginner classes",
      "estimated_hours": 2,
      "difficulty": "beginner-mixed",
      "prerequisites": ["sbs-1", "sbs-2"],
      "learning_objectives": [
        "SBS3: Practice present continuous with clothing vocabulary",
        "SBS8: Learn clothing vocabulary with demonstratives (this/that/these/those)",
        "Both: Describe what people are wearing",
        "Both: Use colors with clothing items"
      ],
      "vocabulary_count": 34,
      "phrases_count": 29,
      "dialogs_count": 5,
      "exercises_count": 5,
      "target_levels": {
        "sbs3": {
          "focus": "Simple present continuous + complex clothing vocabulary",
          "grammar": "Present continuous (am/is/are + wearing), What questions",
          "principle": "Simple sentence structure (I'm wearing...) with specific clothing items and colors"
        },
        "sbs8": {
          "focus": "Demonstratives + descriptions",
          "grammar": "This/that/these/those, singular/plural, adjectives with clothing",
          "principle": "Complex demonstrative structures with familiar clothing vocabulary"
        }
      }
    },
    {
      "id": "sbs-3-10-fusion",
      "chapter_number": "3-10",
      "name": "Present Continuous & Simple Present - Actions & Habits (Fusion SBS3+10)",
      "description": "Combined chapter contrasting present continuous (what you're doing now) with simple present (what you do regularly) - master the distinction between ongoing and habitual actions",
      "estimated_hours": 34,
      "difficulty": "beginner",
      "prerequisites": ["sbs-1", "sbs-2"],
      "learning_objectives": [
        "SBS3: Master present continuous for actions happening now (What are you doing?)",
        "SBS10: Master simple present for habits and routines (What do you do?)",
        "Both: Understand when to use each tense",
        "Both: Learn Yes/No questions and negatives",
        "Both: Practice days of the week and scheduling",
        "Both: Describe daily activities and current actions"
      ],
      "vocabulary_count": 150,
      "phrases_count": 31,
      "dialogs_count": 6,
      "exercises_count": 5,
      "target_levels": {
        "sbs3": {
          "focus": "Present continuous for current actions",
          "grammar": "am/is/are + verb-ing, What are you doing?, Where is he/she?",
          "principle": "Actions happening RIGHT NOW at this moment - temporary situations"
        },
        "sbs10": {
          "focus": "Simple present for habits and routines",
          "grammar": "Do/Does questions, don't/doesn't negatives, short answers, days of the week",
          "principle": "Regular habits, schedules, and general facts - permanent or repeated situations"
        }
      },
      "key_distinction": {
        "title": "NOW vs. ALWAYS",
        "explanation": "Present continuous = temporary actions happening NOW. Simple present = permanent habits or regular schedules.",
        "examples": [
          {
            "present_continuous": "He's eating breakfast (right now in the kitchen)",
            "simple_present": "He eats breakfast every day (regular habit)",
            "user_language_continuous": "他正在吃早餐（现在在厨房）",
            "user_language_simple": "他每天吃早餐（常规习惯）"
          },
          {
            "present_continuous": "I'm reading the newspaper (at this moment)",
            "simple_present": "I read the newspaper every day (daily routine)",
            "user_language_continuous": "我正在读报纸（此刻）",
            "user_language_simple": "我每天读报纸（每日常规）"
          }
        ]
      }
    }
  ],
  "pedagogical_approach": {
    "principle": "Simple phrases + complex words OR complex phrases + simple words - never both at once",
    "class_structure": "2-hour session with differentiated and collaborative activities",
    "level_interaction": "Mixed activities where both levels contribute according to their abilities",
    "benefits": [
      "Both levels stay challenged at appropriate level",
      "Students can learn from each other",
      "Shared themes create classroom cohesion",
      "Efficient use of teacher time with combined classes"
    ]
  },
  "usage_notes": {
    "when_to_use": "Use Fusion chapters when teaching combined classes of different SBS levels",
    "original_chapters": "Original SBS chapters remain available for homogeneous classes",
    "differentiation": "Each chapter targets two specific levels with differentiated content",
    "collaboration": "Exercises designed for both independent practice and collaborative interaction"
  }
}
