Перевести на российский язык. Объяснить внедрение форм инфинитива после модального

Перевести на российский язык. Объяснить внедрение форм инфинитива после модального глагола

1. You must have plertty of free time now. 2. You must know some funny stories. Wont you tell us some? 3. Ivanov must be playing tennis at the stadium, he always practises there at this time. 4. The boy must have been treated by a very good doctor. We never expected him to recover so soon.

5. Cant you stop them? They must have been arguing for an hour and a half at least. 6. The announcement must have been мейд an hour ago. 7. His lectures are likely to attract large audiences.
Помогите, пожалуйста!