1. That work could have been done (by the students without their teacher's assistance).
2. This project cannot be completed in a week (by them).
3. Can I be informed as soon as possible?
4. You will be sent some e-mails during a day.
5. The book couldn't be given back timely, could it?
6. This work must be done in time. Это уже passive.
7. You may not come here! Это нельзя поставить в passive, т.к. отсутствует object (дополнение)
8. He might be present at the lecture, mightn't he? Здесь сказуемое be present - нет глагола, тоже нельзя переделать.
9. The job had to be finished (by him).
10. Good marks are given to the students (by the teacher), aren't they?
Объяснение:
