1. i used to live on a farm

2. mark isn't od enough to ride his  bike to school

3. my dad won't be home before dinner

4. you have to finish all of your homework before...

5. he used to come late for class

6.  i used to afraid of ghost

7. jack is too short to join....

8. he spent an hour doing that exercise 

9. after taking 2 aspirins, kate felt a lot  better

11. i used to live in london

12. before going to bed, i turned off the light 

13. they used to start these machines by hand

14. my father used to work here

15. mary used to spend much money 

16. i'm not used to driving on the left ( to be used to ving: quen với cái gì )