cấu trúc bị động 

hiện tại đơn : S + tobe + p2 + by +O

hiện tại tiếp diễn: S + tobe + being + p2 +by +O 

hiện tại hoàn thành: S+has/have + p2 +by +o

quá khứ đơn : S+were/was+p2+by+o

tương lai đơn:  S+ will be + p2+by+o

modal verb : S+ mordal verb + be +p2+by+o

16. They didn't invite Hoa and Lan to the party.

=> Hoa and Lan weren't invited to the party .

17. Are you doing your test?

=> Is your test being done ?

18. They didn't open the wine for the party.

=> the wine wasn't opened for the party .

19. Minh has just washed these clothes.

=> These clothes have just washed by Minh .

20. The students have prepared the report since last week.

=> the report has been prepared by the students last week .

21. Have they finished the work yet?

=> Has the work been finished yet?

22. They haven't changed the date of the meeting.

=> the date hasn't been changed of the meeting .

23.People can see my house from the river.

=> my house can be seen from the river .

24.We aren't going to give you a ride to town.

=> you aren't going to be given a ride to town.

25.They may use dictionaries in class.

=> dictionaries may be used in class. 

26. Will Mr. Lam buy the house next month?

=> Will the house be bought by Mr. Lan next month?

27.They won't finish the bridge this year.

=> the bridge won't bư finished this year.

28. You can't keep food in that bag.

=> food can't be kept in that bag .

29. I saw a strange man in the garden last night.

=> a strange man was seen in the garden last night .