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1. He has used the computer since he was 19.

2. Children have played games since 9 pm. 

3. Has Dad worked here since I was born? 

4. Peter has watched this film since he came home. 

5. He has never forgotten his bag before. 

6. This is the first time he has 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 to his home village for five months. 

10. The last time we saw her was when we left university. 

11. We have become close friend for a long time. 

12. It's ages since he chatted with his friends through the internet. 

13. How long have you known her? 

14. How long have you worked in that factory? 

15. I used to read newspapers.

16. I am used to getting up in the morning. 

17. I have never used such a best computer before. 

18. It is ten years since I heard this song. 

19. They moved here six months ago. 

20. Minh hasn't written to his pen pal for five months. 

21. They used to wear jeans when they were young. 

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)