1. He may have already done his homework. 2. They can't have seen Jane at the party yesterday. 3. The pupils may be discussing this task at the moment. 4. Our friends may go climbing in the Alps next spring. 5. Hurry up, your parents must be waiting for you at home. 6. The boys must have been playing football since 10 o'clock. They were tired.
Объяснение:
С модальными глаголами глагол, обозначающий действие, должен употребляться в инфинитиве. В зависимости от характера и времени совершения действия инфинитив может быть простой, продолженный, совершённый и совершённо-продолженный.
