Измените следующие предложения,
употребляя сочетания must или may с Indefinite
или Perfect Infinitive:
He probably left his bag at home.
He must have left his bag at home.
It is possible that he knows
He may know her address.
1. It is possible that he will
return in May.
2. He probably lost his key on his way home.
3. It is possible that he left his note-book
at his office.
4. The text is probably very difficult as he
cannot translate it without a dictionary.
5. It is possible that it will rain to-morrow.
6. It is possible that he was a good singer
once, but now he can't sing at all.