used to = đã từng

form : 

(+) S + used to + Vo..

(-) S + didn't use to + Vo...

(?) Did + S + use to + Vo....

- S + used to + Vo .... before / then + S + V past 

1. He (live)...........used to live.................... in London before he(go) ..........went....................abroad.

2. I(earn) .........used to earn............. a lot of money, but then I (lose).....losed ..................my job.

3. I'm surprised that they (join) ....joined................. the tennis club. They didn't ues to like tennis.

4. ........Did......... you (travel)....use to travel............ a lot before you (become) ....became.................. a teacher ?

5. That radio (work) ....used to work..... before I (drop)......dropped......... it.

6. We (see) ...used to see.......... them very week, but then we (have).....had...... an argument.

7. She (play).....used to play...... tennis a lot before she (break) ........broke........ her leg.

8. She (drive)........used to drive.............. a lot before she (have).........had.......... an accident.

9. We (have)........used to have............a gadern, but then we (move).....moved............. to a different house.