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IV/ Mờ
V/
1. How did your family go to London last summer?
2. How often does Lien watch TV after dinner?
3. How long have you lived here?
4. Why didn't you phone me yesterday?
5. Who does Hoa live with in Ha Noi?
6. What does Minh want to buy in the post office?
VI/
1. When did you use the car?
2. I haven't seen Nam for three years.
3. It is very important to keep the environment clean.
4. Loan hasn't given her sister a present for over three years.
5. Mai wished he had looked for the suitcase she lost last week.
6. He asked Tim not to tell anyone what she had said to him the day before.
7. The movie was so boring that they couldn't see through.
8. The old man isn't strong enough to walk by himself.

9. Your bag isn't the same as mine.
10. I have played the piano for two years.