Here you are a few tips about what we saw in class yesterday.
Must, can't ,must have + past participle, can't have +past participle... can be used when we want to say how sure we are that something happened / is happening / will happen. We often call these 'modals of deduction' or 'speculation' or 'certainty' or 'probability'.
For example:
It is snowing so it must be very cold outside.
I don't know where John is. He could have missed the train.
This bill can't be right. $200 for two cups of coffee.
Activity 1Activity 2
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