=>
1. A lot of money is spent on advertising by Huong every year.
2. John's homework is being done in his room now.
3. A zebra is being attacked in the jungle by a lion at the moment.
4. The kite is being flown on the paddy field by Lan now.
5. She is going to be taken to Dalat by her parents next week.
6. Cars left here will be towed away by the police.
7. A robber was arrested in the forest by the police yesterday.
8. Luckily, the dog wasn't run over on the street by the car three days ago.
9. The window was broken and some pictures in the art gallery were taken away by the boy last year. 
10. My friend, Jane was told not to come here again by me.

PASSIVE VOICE.

1. Huong spends a lot of money on advertising every year.

=> A lot of money is spent on advertising by Huong every year.

2. John is doing his homework in his room now.

=> John's homework is being done in his room by him now.

3. A lion is attacking a zebra in the jungle at the moment.

=> A zebra is being attacked in the jungle by a lion at the moment.

4. Lan is flying the kite on the paddy field now.

=> The kite is being flown on the paddy field by Lan now.

5. Her parents are going to take her to Dalat next week.

=> She is going to be taken to Dalat by her parents next week.

6. The police will tow away cars left here.

=> Cars will be towed away left here by the police.

7. The police arrested a robber in the forest yesterday.

=> A robber was arrested in the forest by the police yesterday.

8. Luckily, the car didn't run over the dog on the street three days ago.

=> Luckily, the dog wasn't run over on the street by the car three days ago.

9. The boy broke the window and took away some pictures in the art gallery last year.

=> The window was broken and some pictures were taken by the boy in the art gallery last year.

10. I told my friend, Jane not to come here again.

=> My friend, Jane was told not to come here again by me.

+) Câu bị động: S + to be + PII + O (by sb).