2. A lion was seen by him at the circus last week.

3. I was told this story  by Sam and Nina.

4. The door was opened by me.

5. This cake was eaten by your children.

6. The report has been finished by me.

7. This child had been looked after when  I came.

8. This decision was made by my father.

9. It can't be done.

10. This report must be sent.

IV.

1. My father has never  seen that movie.

(Câu bị động phải là That movie has never been seen by my father - đề bài sai)

2. No one has finished the book.

3. Has Nina eaten snake meat?

4. Sam was cleaning the department when you called.

5. While Nina was writing the report, Tom was looking for the key.

6. Someone sent her a present.

7. My father bought this car.

8. My sister types the letter everyday.

9. Does your mother find the key?

10. Where does your mother find the key?