Cấu trúc: S+used+V

             tobe+S+used+ving

II.

1, go

2. be

3. writing

4. haven't finshed (yet dấu hiệu thì present perfect)

5. live

6. have done (seversal time dấu hiệu thì present perfect)

7. met (the last time  dấu hiệu thì past simple)

8. writing

9. be

10. to go 

III. 

1. John used to smoke a lot a year ago, but now he doesn't smoke any more.

2. I used t stay up late to watch footballl match last year, but now l don't.

3. My mother used to wash clothes by hand in the past, but she no longer does it now.

4. It is 300 km from Ho Chi Minh to Phu Quoc. 

5. There used to be some trees in the field, but now there aren't.

III.

1. It is 500 metres from my house to judo club.

2. It is 5 km from my house village to the town.

3. It is 80 km from my town to Ha Noi.

4. It is 3 km from my house to the stadium.

5. It is It is about 30 km from my house to Thai Binh city.