1. stopped        

2. smoke/will object

3. wouldn’t your parent be

4. would have/hadn’t spent

5. worked/would finish

6. had/would use

7. would take   

8. won’t let

9. didn’t smoke 

10. gave/would you do

11. freezes       

12. would have warned

13. sees                       

14. resigned

15. would have written

16. see

17. turn            

18. wouldn’t leave

19. would you say

20. get

21. weren’t (wasn’t)

1.If she had a college degree, she could be employed.

2.If I had enough money, I could go on a long holiday this year.

3.If he weren't very slow, we would give his such an important task.

4. If I didn't have to work this Sunday, I would join your picnic.

5.If he didn't have to pay father's debs, he wouldn't work overtime to get more money.

6.If everything weren't expensive, city life would be enjoyable.

7.Tf there weren't industrial factories inside the city,pollution could be reduced.

8. Everything on the earth wouldn't grow well if the sun didn't shine.

9.If there weren't a grammar error in this English composition, it could get a full mark.

10. If I had a typewriter. I could type it myself.

11. If I buy a new hat, I’ll give it to you.

12. If you ask the teacher, he’ll explain the lesson to you.

13. If Mary saw the sight, she could tell you about that.

14. If I knew his address, I could give it to you. 

15. He would have looked a lot better if he had shaved more often.

16. If she hadn't been ill, she would have gone to work.

17. If it hadn't been raining all morning, we would have gone out.

18. If he hadn't been tired, he wouldn't have made a mistake.

19. If Peter had written to me, I would have written to him.

20. If you had asked Alice, she would have told you the truth.

1. Unless

2. If

3. If

4. If

5. If

6. If

7. Unless

8. Unless

9. Unless

10. Unless

1/ We won’t go out unless it stops raining.

=> We won’t go out if it doesn't stop raining.

2/ I will call the police unless you give back my bicycle.

=> I will call the police if you don't give back my bicycle.

3/ You wouldn’t be able to do this exercise unless your English were good.

=> You wouldn’t be able to do this exercise if your English were not good.

4/ Unless we had enough rain, we couldn’t grow rice.

=> If we didn't have enough rain, we couldn’t grow rice.

5/ The fishermen couldn’t have caught a lot of fish unless they had had good nets.

=> The fishermen couldn’t have caught a lot of fish if they hadn't had good nets.

6I wouln't buy it unless I could afford it 
⇒I wouln't buy it if I couldn't afford it 

7/ I would refuse to go unless they paid my expenses 
⇒ I would refuse to go if they didn't pay my expenses 
8/ I don't agree with his economic policy. I wouldn't vote for him unless he changed it 
⇒I don't agree with his economic policy. I wouldn't vote for him if he didn't change it 
9/ He wouldn't have written unless he had heard news 
⇒He wouldn't have written if he hadn't heard news 
10/ You might not have a terrible toothache unless you went to the dentist regularly 

⇒You might not have a terrible toothache if you go to the dentist regularly