A. Với động từ thường:
1. This dictionary is not used very often by people.
2. Oil has been found in the Antarctic by them.
3. This present was given to Mary an hour ago by someone.
4. I was told that our teacher was sick by them.

B. Với động từ khuyết thiếu:
1. Lan should be invited to the party by you.
2. The flight has to be canceled because of the bad weather.
3. The project had to be finished on time by us.
4. The old building ought to be knocked out by them.
5. A cure for cancer can be found in the near future by people.

C. Với cả hai trường hợp trên:
1. The 22nd SEA Games were held in Vietnam in 2003.
2. Your bike might be stolen if you leave it outside.
3. English is learned all over the world by them.
4. He will be met at the airport by us.
5. He has been known well by them.
6. Rice is not planted in that country by them.
7. Her house was sold last year by her.
8. This work must be done right away by you.
9. His exercises are always finished on time by him.
10. My window has been broken by the boy for an hour.