12. Lan has left her school for a long time.
15. It has been two months since he last wrote to me.
16. It's three years since she last heard that song.
17. I haven't seen her for 2 years.
18. Nam hasn't played the piano for ten years.
19. Mary hasn't been seen for 20 minutes.
20. I haven't seen David since 1995.
21. She hasn't gone out with him fro 2 years.
22. It is 9 months since she last went out with him.
23, I last visited Malaysia 2 years ago.
24. It's two years since we last received a letter.
25. He hasn't written to me for 3 months.
26. The last time he wrote to me was 3 months ago.
27. It's 3 months since he last wrote to me.
28. Hoa hasn't met her olf friends since they left school.
29. I haven't written War and Peace since 2005.
30. It's two years since we last visited HN.
31. I haven't seen him when i was a student.
Bn học tốt!!