1. Before she (go)_____________ to bed, she (finish) _____________ her homework.

2. Few people (understand) _____________ the news when the consequences began to appear.

3. After they (go)_____________, he (sit) _____________  down and (rest) _____________.

4. When I came to the theatre, the film (start)_____________.

5. Before she (listen)_____________ to music, she (do) _____________ homework.

6. Last night, David (go)_____________ to the supermarket before he (go)_____________ home.

7. _____________ you (finish)_____________ the report before he asked for it?

8. Our boss (not make)_____________ the decision yet when management changed their mind.

9. Mark (want) _____________to go to New York, but his wife changed his mind.

10. We (eat already)_____________ so we weren't hungry.

11. _____________ you (take) _____________ part in this game if you have free time?

12. People who do voluntary work in this city (give) _____________ out free food to the poor for a long time.

13. How often _____________ you (practise) _____________ speaking English?

14. I (get) _____________ good marks after my examination finished at school.

15. _____________ they (leave) _____________ their house when their parents visited them?

16. If I were you, I (not go)       _____________ out alone.

17. Jenny usually (attend) _____________ her teachers' lectures on time.

18. In my house, pigs are often (feed) _____________by my mother.

19. How about (travel) _____________ to Nha Trang beach this weekend?

20. Anna (not manage) _____________ to prevent her cats from fighting with each other since the first time.
làm và giải thích cách làm giúp mình với ạ,cảm ơn!