=>
4/
1. would be
2. didn't go
3. use
4. doesn't want
5. took
6. drive
7. will visit
8. will accept
9. would be
10. would happen
11. got
12. show
13. would be
14. turned
15. will forgive

5/
1. Sai
2. Sai
3. Sai
4. Sai
5. Sai
6. Đúng
7. Sai
8. Đúng
9. Sai
10. Sai
Sửa lại :
1. Pollution can be reduced if we join hands to preven it.
2. If farmers made use of pesticide more wisely, the soil would not be poisoned.
3. I won't believe unless you show me the evidence.
4. Unles you tell me the truth, I won't help you.
5. If James were more outgoing, he would have more friends.
7. If you paid more attention to what I said, you wouldn't make so many mistakes.
9. You will be punished if you park your car here.
10. If you win the competition, we will have a celebration.

6/
1. will save
2. were/what would you do
3. would happen
4. didn't throw
5. would see
6. will suffer
7. will cause
8. change
9. will reduce
10. take