1. called/ wasn't/ was studying

2. didn't hear/was sleeping

3. was shining/ was singing

4. was talking/walked

5. wasn't/ was playing

6. fell/was reading

7. was snowing/ was shining

8. was shoveling/brought

9. had/was driving/hit

10. decided/ were starving

11. were waiting/arrived

12. was swimming/saw

13. Were they playing/started

14. were driving/stoped

15. was blowing/went

Sử dụng Past continuous cho hành động đang xảy ra trong quá khứ, trong khi Past simple cho hành động xen vào hành động đang xảy ra ấy.

1. called/ wasn't ...... was studying

2. didn't hear ...... was sleeping

3. was shining ......  was singing

4. was talking .... walked

5. wasn't ...... was playing

6. fell ...... was reading

7. was snowing ......  was shining

8. was shoveling ...... brought

9. had/was driving ...... hit

10. decided ...... were starving

11. were waiting ...... arrived

12. was swimming ...... saw

13. Were they playing ...... started

14. were driving ...... stoped

15. was blowing ...... went