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Ex1/
1. wish > wishes
2. didn't rained > didn't rain
3. was > were
4. have > had
5. didn't rain > hadn't rained
6. gives > gave 
7. studied > had studied
8. will > would
9. stops > stopped
10. is > were
11. is > were 
12. will > would
13. am > were 
14. been > be
15. wish > wishes
Ex2/
1. were
2. had visited
3. would give

4. could take

5. had known

6. would see

7. were

8. had not wasted

9. had come

10. had spent

11. had come

12. had

13. had watched

14. had not given

15. had understood

Ex3/
1. I wish there were some water.
2. I wish I had enough money to buy a car.
3. I wish I were tall to reach the light.
4. I wish I could go out.
5. I wish I would pass the exam.
6. I wish I had good marks.
7. I wish you wouldn't go out.
8. I wish you wouldn't be silly.
9. I wish you would open your box.
10. I wish I didn't sit here alone.
11. I wish there weren't any red pepper in my food.
12. I wish she liked me.
13. I wish he wouldn't go.
14. I wish she would take it.
15. I wish I were a doctor.