19. The meeting had to be broken up by the police.

20. That room may be used for the classroom.

21. Your hands must be washed.

22. The old building ought to be knocked down.

23. That report needn't do be typed today.

24. This room hasn't been used for ages.

25. That problem can't be solved.

26. We wasn't told the news.

27. I wasn't told the ending of the story by Paul.

28. She will be given a prize by the teacher if she works well.

29. She was bought a doll by her mother last week.

CT bị động :

+) Thì quá khứ đơn : S + was/were + V(PII) + place + (by + O) + time.

+) Thì tương lai đơn : S + will + be + V(PII) + place + (by + O) + time.

+) Động từ khuyết thiếu : S + dtkt + be + V(PII) + place + (by + O) + time.

* Cấu trúc : 

- Thì quá khứ đơn : S + was/were + V_PP + (by + O) 

- Thì tương lai đơn : S + will + be + V_PP + (by + O) 

- Model Verb : S + model verb + be + V_PP + (by + O) 

19. The meeting had to be broken up by the police.

20. That room may be used for the classroom.

21. Your hands must be washed.

22. The old building ought to be knocked down.

23. That report needn't do be typed today.

24. This room has not been used for ages.

25. That problem can't be solved.

26. We were not told the news.

27. I was not told the ending of the story by Paul.

28. She will be given a prize by the teacher if she works well.

29. She was bought a doll by her mother last week.