1. At this time last year, they (build) …were building………….. this house.
2. Last year, they (build) ……built……….. this house.
3. Before last year, they (build) ……had built……….. this house.
4. My father (watch) ……was watching……….. TV when I got home.
5. At this time yesterday, I (prepare) ……was preparing……….. for my son’s birthday party.
6. What were you (do) ……doing……….. at 8 pm yesterday?
7. When I came to the stadium, the match (start) …………had started……………………….
8. Before she (listen) ……listened…………….. to music, she (do)……had done……………….
homework.
9. Last night, Peter (go) ……had gone…………….. to the supermarket before he (go)
………went………… home.
10. My sister (read) ……was reading……….. books while my brother (play) was playing football yesterday
afternoon.
11. I (drive) …was driving………….. my car very fast when you called me.
12. I (chat) …was chatting………….. with my friends while my teacher (teach) was teaching the lesson yesterday.
13. They (come) …came………….. back home after they (finish) ……had finished…………… their work.
14. She said that she ( meet) ……had met………………. Mr. Bean before.
15. Before he (go) ………went………………….. to bed, he (read) ………had read………………… a
novel.
16. He told me he (not/wear) ……………had not worn…………… such kind of clothes before.