ex4

16. tom wasn't allowed to take these books home

17. exercises won't be corrected by the teacher tomorrow

18. many people are attracted by this well-known library

19. the meeting was attended by all students

20. my bike can't be repaired

 mình chỉ bt làm bài 4 thôi mong bn thông cảm

Ex3:

1. If the water weren't too dirty, we could bathe in this part of river.

12. If we didn't have four air conditioners in our house, we wouldn't spend too much money on electricity.

13. If I had Linh's address, I could write to her.

14. If Dick didn't drive carelessly, he wouldn't often cause accidents.

15. If we didn't waste a lot of money on unnecessary things, we could give much help to the poor.

Ex4:

16. Tom wasn't allowed to take these books home.

17. Exercises won't be corrected by the teacher tomorrow.

18. Many people are attracted by this well-known library.

19. The meeting was attended by all students.

20. My bike can't be repaired.