1. Several lessons have been missed by some students
2. A film about our teacher is going to be made (by them)
3. Students' project will have been finished by next month (by them)
4. The business latter must be answered at once
5. By whom was this thing designed?
6. The latest events are being talked about (by them)
7. Anything can't be done at all (by us)
8. Arrangements will be made by us as soon as he comes
9. By whom were the tickets booked?
