Bài 12:

1.don't

2 doesn't

3.don't

4.don't

5.doesn't

6.doesn't

7.don't

8.doesn't

Bài 13:

1. doesn't study 
2. has
3. have
4. doesn't study
5. teaches
6. likes
7. washes
8. don't have

9. 

My cousin, Peter, has a dog. It is an intelligent pet with a short tail and big black eyes. Its name is Kiki and it likes eating pork. However, it never bites anyone; sometimes it  barkes when strange guests visit. To be honest, it is very friendly. It  does not like eating fruits, but it often plays with them. When the weather becomes bad, it just sleep in his cage all day. Peter plays with Kiki every day after school. There is many people on the road, so Peter does not let the dog run into the road. He often takes Kiki to a large field to enjoy the peace there. Kiki sometimes is naughty, but Peter loves it very much.

Bài 14:

1. She doesn’t sleep late at weekends.

2. We don’t believe the Prime Minister.

3. Do you understand the question?

4. They don’t work late on Fridays.

5. David wants some coffee.

6. She has three daughters.

7. When does she go to her Chinese class?

8. Why do I have to clean up?

9. How often does she go to the cinema?

10. She doesn't go to the church

Bài rewrite:

1. She doesn’t sleep late at weekends.

2. We don’t believe the Prime Minister.

3. Do you understand the question?

4. They don’t work late on Fridays.

5. David wants some coffee.

6. She has three daughters.

7. When does she go to her Chinese class?

8. Why do I have to clean up?

9. How often does she go to the cinema?

10. She doesn't go to the church

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