🔎 Summit: Must Be & Can't Be
The studio door is unlocked, the tea is still warm, and nothing is missing — someone must be near. Students learn to make near-certain deductions with must be, rule out impossible ideas with can’t be, and tie every deduction to evidence with because. They finish by writing a 50–80-word case report about a scene of their own.
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Lesson Plan
- Four quick detective scenes to read and discuss
- Say what you know for sure — before any grammar
Key Vocabulary
Grammar Points
- Deduction with must be: subject + must + be + noun/adjective/-ing when evidence makes something almost certainly true
- Deduction with can’t be: subject + can’t + be + noun/adjective/-ing when evidence makes something impossible
- The opposite of must be in deductions is can’t be — mustn’t expresses rules, not deductions
- Evidence sentences: clue + deduction (The lights are on, so someone must be inside)
