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20. aren't
21. leaves
23. don't change
24. want
25. hung
26. would be able
27. wouldn't buy

IV/
1. If I had enough money, I would buy it.
2. I could help you if I were busy right now.
3. If he weren't very thin, he wouldn't feel the cold so much.
4. I'll never speak to her again if she doesn't apologize to me.
5. If the weather weren't snowy, we would go to school.
6. If you didn't drink too much coffee, you could sleep.

7. If you press this button, the machine will stop.
8. If you make me some coffee, I'll give you one of my biscuits.
9. If you work so much, you will be tired.
10. If he had the money, he could afford a new car.
11. If I didn't have a date with my old classmates, I could go to the beach with you this weekend.
12. If I didn't have lots of good friends, I would get lonely.
13. If it didn't rain heavily, the match couldn't be cancelled.

14. If she weren't very shy, she would enjoy parties.
15. If he took some exercises, he wouldn't be unhealthy.
16. If my father lends me a car, I can take you.
17. If he saved enough, he would buy a computer.
18. If I weren't very busy, I would go with you tonight.
19. If I had a watch, I could tell you what time it is.
20. If the dress weren't very expensive, she could buy it.