1. Are letters typed by Mary in the office?

2. Are you helped by his father?

3. Is human life changed by science and technology?

4. Is this bottle broken by Peter?

5. Is English learned in the room?

6. Is your mind changed by him?

7. I wasn't told about it.

8. Her telephone number isn't known by me.

9. The children aren't brought home by my students.

10. A present isn't sent to me.

11. Are we given more information by her?

12. All the workers of the plan aren't instructed by the chief engineer.

13. Tea wasn't made with cold water.

14. Some of my books aren't taken away.

15. The meeting wasn't held before May Day.

16. The engine of the car isn't had to be repaired.

17. The window wasn't broken and some pictures weren't taken away by the boys.

18. Are a lot of money sent on advertising every day?

19. Was a story told by the teacher?

20. A cake wasn't cut with a sharp knife by Mary.

1: Are letters typed by Mary in the office?
2: Are you helped by his father?
3: Is human life changed by science and technology?
4: Is this bottle broken by Peter?
5: Is English learned in the room?
6: Is your mind changed by him?
7: I wasn't told about it
8: Her telephone number isn't known
9: The children aren't brought home by my students 
10: A present isn't sent me
11: Are we given more information by her?
12: All the workers of the plan aren't instructed by the chief engineer
13: Tea wasn't made with cold water
14: Some of my books aren't taken away
15: The meeting wasn't held before May Day
16: The engine of the car isn't had to be repaired
17: The window wasn't broken and some pictures weren't taken away by the boys
18: Are a lot of money sent on advertising every day?
19: Was a story told by the teacher?
20: A cake wasn't cut with a sharp knife by Mary