I. Chuyển câu chủ động sang câu bị động: 1. They sell jeans all over the world. .................................................. ........................................................... ................................. 2. They are building a new school in this town. ...................................................... ........................................................... ..................... 3. The clown made us laugh a lot. ...................................................... ........................................................... ...................................... 4. He finished his exercises on time. ……………………………………………………………… 5. People plant rice in those fields. ………………………………………………………………. 6. this boy broke my windows yesterday. ………………………………………………………… 7. did you do your test perfectly? ………………………………………………………………. 8. They have known him well. ………………………………………………………………. 9. They have postponed the concert. ……………………………………………………………… 10. My father bought me a video recorder. ………………………………………………………. 11. The police didn’t interview the witness. ………………………………………………………………….….............................. 12. They use cars and trucks to carry food to market. ……………………………………………………………………………………………. 13. They have built a new hospital near the airport. ……………………………………………………………………………………………. 14. He hasn’t seen the younger son for three weeks. ……………………………………………………………………………………………. 15. The secretary opens the mails every morning. ………………………………………………………… 16. No one has opened that box for the past hundred years. ……………………………………………………………………………………… 17. The fire has destroyed many houses. ………………………………………………………………… 18. The children are carrying the chairs into the house. ……………………………………………………………… 19. She cleans the floor every morning ………………………………………………………………………………… 20. He will solve the problem soon. ……………………………………………………………………………………… 21. She made a lot of mistakes in the examination. ……………………………………………………………………………………… 22. No one has locked the door. ………………………………………………………………………………………

1. They sell jeans all over the world. 

=> Jeans are sold all over the world

2. They are building a new school in this town. 

=> A new school are being built in this town

3. The clown made us laugh a lot. 

=> We were made to laugh a lot by the clown

4. He finished his exercises on time.

=> His exerxises were finished on time by him

5. People plant rice in those fields.

=> Rice  in those fields is planted

6. this boy broke my windows yesterday.

=> My windows were broken yesterday by this boy

7. did you do your test perfectly?

=> Was your test done perfectly ?

8. They have known him well.

=> He has been known well

9. They have postponed the concert.

=> The concert has been postponed 

10. My father bought me a video recorder.

=> I was bought a video recorder by my father

11. The police didn’t interview the witness.

=> The witness weren't interviewed by the police

12. They use cars and trucks to carry food to market.

=> Cars and trucks are used to carry food to market

13. They have built a new hospital near the airport.

=> A new hospital has been built near the airport

14. He hasn’t seen the younger son for three weeks.

=> The younger son hasn't been seen for three weeks by him

15. The secretary opens the mails every morning.

=> The emails are opened every morning by the secretary

16. No one has opened that box for the past hundred years.

=> That box hasn't been opened for the past hundred years

17. The fire has destroyed many houses.

=> Many houses have been destroyed by the fire

18. The children are carrying the chairs into the house.

=> The chairs are being carried into the house by the children

19. She cleans the floor every morning

=> The floor is cleaned every morning by her

20. He will solve the problem soon.

=> The problem will be solved soon by him

21. She made a lot of mistakes in the examination.

=> A lot of mistakes were made in the examination by her

22. No one has locked the door.

=> The door hasn't been locked