. Rewrite the sentences in the passive voice 1. You must take off your shoes. 2. He shouldn't smoke cigarettes in this room. 3. We could see Tom in the crowd. 4. Eddie might help you if you ask him. 5. Can we order some lemonade at the bar? 6. They ought to patk their car in the right place. 7. Mary used to keep a dog. 8. We have to protect our sea . 9. Did you use to take him to school by motorbike?

1. Your shoes must be taken off.

2. Cigarettes shouldn't be smoked in this room.

3. Tom could be seen in the crowd.

4. You might be helped by Eddie if you asked him.

5. Could some lemonade be ordered at the bar?

6. Their car ought to be parked in the right place.

7. A dog used to be kept by Mary.

8. Our sea have to be protected.

9. Did he used to be taken to school by motorbike?

->Bị động: Động từ khuyết thiếu+be+V_ed/V_cột3:

must/shouldn't/could/might/ought to/used to+be+V_ed/V_cột3

->Bị động: Could+S+be+V_ed/V_cột3...?

Câu bị động với động từ khuyết thiếu (modal verb), bao gồm:

Can - may - must - should  - ought to - might   -  will   -   could - have to - used to...

S + ĐTKT + be + PII +...+ (by + O) + TG

Dạng câu hỏi đảo động từ khuyết thiếu lên đầu câu.

Đáp án:

1. Your shoes must be taken off.

2. Cigarettes shouldn't be smoked in this room by him.

3. Tom could be seen in the crowd by us.

4. You might be helped by Eddie if he is asked by you.

5. Can some lemonade be ordered at the bar by us?

6. Their car ought to be parked in the right place.

7. A dog used to be kept by Mary

8. Our sea has to be protected.

9. Did he use to be taken to school by motorbike by you?