=>
13. has been taken
-> bị động HTHT have/has been V3/ed
14. must be sent
-> bị động must be V3/ed
15. already been offered
-> bị động QKHT had been V3/ed
16. are grown
-> bị động HTĐ is/am/are V3/ed
17. was taught
-> bị động QKĐ was/were V3/ed
18. was written
-> bị động QKĐ was/were V3/ed
19. have been warned
-> bị động HTHT have/has been V3/ed
20. had been eaten
-> bị động QKHT had been V3/ed
21. have already been given 
-> bị động HTHT have/has been V3/ed
22. was disturbed
-> bị động QKĐ was/were V3/ed
23. is made
-> bị động HTĐ is/am/are V3/ed
24. Have the packages been delivered
-> bị động HTHT have/has S been V3/ed?
25. was seen
-> bị động QKĐ was/were V3/ed

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)