Bài 8:Chia động từ trong ngoặc ở thì hiện tại hoàn thành.
1. I (live)                             here since 1989.
2. They (work)                             for this factory for 20 years.
3. He (read)                              this novel three times.
4. Hoa and I (know)                              each other since we were at the same class.
5. I (not/see)                          her since last month.
6. I (not/work)                            have not worked today.
7. We (buy)                            a new lamp.
8. We (not/plan)                           our holiday yet.
9. Where (be/you)                               ?
10. He (write)                               five letters.
11. (be/you)                                at school?
12. School (not/start)                             yet.
13. (speak/he)                                to his boss?
14. No,he (have/not)                            the time yet.
15. The cat (just/catch)                              a mouse.
16. He (already/invite)                              his friends.
17. Julia (make)                                  a table with three columns.
18. The teacher (lose)                          the keys,so he can’t open the door.
19. I (just/clean)                               my bike.
20. My friends (give up)                              smoking.
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