=>
3/
1. If he didn't have to study for his exam, he could go out.
2. If she weren't lazy, she could pass the exam.
3. If he pays me tonight, I will have enough money to buy a car.
4. If he didn't smoke too much, he could get rid of his cough.
5. If she weren't very shy, she would enjoy the party. 
6. If I get a work permit, I will stay for another month.
7. If he took some exercises, he wouldn't be unhealthy.
8. If I had the right change, we could get the ticket.
9. If you don't study hard, you won't pass the exam.
10. If you are impatient, you will make mistakes.

4/
1. Mary is the fastest in the class.
2. You have written more than me.
3. Mary's hair was longer than Tom's hair.
4. I am the noisiest student in the school.
5. This film was more interesting than the first film.
6. That house is more expensive than this house.
7. Your dog didn't eat asmuch as my dog.
8. Football is more exciting than volleyball.
9. Tom's father is more interested in movies than him.
10. No one else in this class cooks better than Mary.

5/
1. She is a good cook.
2. My aunt is a very good English teacher.
3. He is a very slow cyclist.
4. He is a careful typist.
5. These children can run quickly.
6. My father is a very good soccer player.

1.A

2.B

3.D

4.C

5.D

6.A

7.B

8.D

9.C

10.D