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1. He must work late, mustn’t/must he? 2. He mustn’t work late, must/mustn’t he? 3. Red must be one of the most powerful colours, is/isn't it? 4. He must be a bus driver, is/isn’t/must/can’t he? 5. He must know, does/doesn’t/must/can’t he? 6. He might know, does/doesn’t/might/mightn’t he?
Deduction and obligation Question tags 
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