3. The dinner is being prepared in the kitchen by her mother.

4. Our teeth should be cleaned twice a day.

5. The English grammar has been explained by our teachers.

6. The accident in this city was caused by some drunk drivers.

7. Tom's parents will be visited next month.

8. The secretary wasn't phoned by the manager this morning.

9. Was this beautiful dress bought by Mary?

10. These old pictures won't be hanged in the living room.

11. I am brought this dish by the waiter.

12. These postcards are sent to us by our friends.

13. This story was told by their grandmother when they visited her last week.

14. This train ticket was ordered for Tim's mother.

15. I wasn't shown the special camaras.

16. Her ticket was shown to the airline agent.

17. His friend is lent his new shoes.

18. Her relatives were left 5 million pounds.

19. These boxes were handed to the customer by the shop assistant.

20. The first prize was awarded to the reporter by the board.