turn into passive forms: they sell jeans all over the world : jeans..... they have built two department stores this year : two department stores....... the doctor has operated Tom since 10 o'clock : Tom ...... A man returned the keys to me :the keys..... they made jean cloth completely from cotton in the 19th century : jean cloth the teacher won't correct the exercises tomorow : the exercises... My cousin will meet you at the staion : you... He can't repair my bike : my bike...... We can slove the problem : the problem.... You must do this exercise carefully : this exercises.... pople should stop experiments on animals : experiments on animals.... we might find life on another planets : life we have to inprove all the schools in the city :all the schools in the city..... they are going to build a new bridge in the area: A new bridge

Để chuyển các câu cho dạng Passive, ta cần thêm trợ động từ "be" theo thì và thay đổi động từ chính thành dạng Past Participle. Dưới đây là cách làm của mỗi câu:

1. They sell jeans all over the world: Jeans are sold all over the world by them.
2. They have built two department stores this year: Two department stores have been built this year by them.
3. The doctor has operated Tom since 10 o'clock: Tom has been operated on by the doctor since 10 o'clock.
4. A man returned the keys to me: The keys were returned to me by a man.
5. They made jean cloth completely from cotton in the 19th century: Jean cloth was completely made from cotton by them in the 19th century.
6. The teacher won't correct the exercises tomorrow: The exercises won't be corrected by the teacher tomorrow.
7. My cousin will meet you at the station: You will be met at the station by my cousin.
8. He can't repair my bike: My bike can't be repaired by him.
9. We can solve the problem: The problem can be solved by us.
10. You must do this exercise carefully: This exercise must be done carefully by you.
11. People should stop experiments on animals: Experiments on animals should be stopped by people.
12. We might find life on another planets: Life might be found on another planets.
13. We have to improve all the schools in the city: All the schools in the city have to be improved by us.
14. They are going to build a new bridge in the area: A new bridge is going to be built in the area by them.

Jean cloth was made completely from cotton in the 19th century.

The keys were returned to me by a man.

Tom has been operated by the doctor since 10 o'clock.

Two department stores have been built this year.