: Hãy sử dụng thì Quá khứ hoàn thành hoặc thì Quá khứ đơn hoặc thì hiện tại hoàn thành cho mỗi động từ trong ngoặc.
11. The workers (complain) about the matter to me many times. 12. They (put) up the tent before it (rain). 13. The storm (destroy) thousands of houses in the city since it (appear). 14. She (turn) off the lights and (lock) all doors. 15. They were driving a car when they (realize) that they (not fasten) their seat belt. 16. I (work) with Mr. Thang several times. He is a good man. 17. Their friendship (last) for 20 years. I think they can’t live without the friendship. 18. They (build) the house before he came back. 19. He (not change) his mind recently. 20. They no sooner (read) the newspaper than the bell (ring)
1 have complained
2 had put - rained
3 has destroyed - appeared
4 turned - locked
5 realized - hadnt fastened
6 have worked
7 has lasted
8 had built
19 hasn't changed
20 had - read - rang