1. Where was Peter yesterday?.He must have been at school.The school started a week ago.
2. Im absolutely sure! They must have arrived yesterday.I saw their tickets.
3. The course. may begin on the fifth of September but Im not so certain aboit it.
4. Are you joking! Nick couldnt have gone to Moscow last week. Hes supposed to be at work now.
5. They may have come from London, but Im not sure.
6. We must have taken the wrong turn.We should be there by now.
7. They might have missed their train.Otherwise they wouldne be here by now.
8. It couldnt be Masha who answered the phone because shes away.
9. I cant find my cat anywhere.She couldnt have got out through the window.The opening is too small.
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