1. This exercise can be done by Phong
2. The meal must be prepared carefully by you
3. His mother should be helped by Huy
4. That film has been seen by Hoa
5. That car has been bought by Long
6. The tables have been made
7. These old papers will be collected by my father
8. That letter was sent by me two days ago
9. English is spoken in many countries
10. These exercises were written last week
QKĐ: S + was/ were + PP + (by O)
QKTD: S + was/ were + being + PP + (by O)
QKHT: S + had + been + PP + (by O)
HTĐ: S + am/ is/ are + PP + (by O)
HTTD: S + am/ is/ are + being + PP + (by O)
HTHT: S + have/ has + been + PP+ (by O)
TLĐ: S + will be + PP + (by O)
TLG: S + is/ am/ are + going to + be + PP + (by O)
S + modal verb (should, must, have to, can,...) + be + PP + (by O)