[ must + infinitive (without to) ]
[ must + have + past participle ]
- You've been travelling all day. You must be tired.
- You must be worried that she is so late coming home.
- I didn't hear the phone. I must have been asleep.
- I've lost one of my gloves. You must have dropped it somewhere.
- To say that you think something is essential or necessary.
[ must + infinitive (without to) ]
- I must buy flowers for my mother. Tomorrow is her birthday
- I must stop smoking.
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