13. has been taken
14. must be sent
15. already been offered
16. are grown
17. was taught
18. was written
19. were warned
20. had been eaten
21. have already been given
22. was disturbed
23. is made
24. Have the packages been delivered
25. was seen
QKĐ: S + was/ were + 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 + be + PP + (by O)
