1. He has used a computer since he was 19
2. Children have begun playing games at 9 pm
3. Has Dad started to work here when I was born?
4. Peter has watched the film when he came home
5. He has never forgotten his bag before
6. This is the first time he played a computer game
7. I haven't written to my uncle since June
8. We haven't seen her for 2 months
9. He hasn't come back for 5 months
10. The last time we have seen her when we lift university
11. We have become a close friend for a long time
12. It's aged for him to chat with his friends through the Internet.
13. How long did you know her?
14. How long did you work in that factory?
15. I used not to read the newspaper anymore
16. I am used to getting up early in the morning
17. I have never used better than this computer before
18. It's the last time I've heard about this song is ten years ago
19. They moved here for six months
20. Minh hasn't written to his pen pal for five months
21. They used to wear jeans when they were young
Chúc bạn học tốt!!! ( Nếu mình có sai sót gì thì mong bạn thông cảm)