=>
1. We haven't seen her since Christmas Day.
2. This is the first time I have eaten this kind of food.
3. It has rained for an hour.
4. The last time we visited my grandfather was two months ago.
5. I began studying English three years ago.
6. It's nearly five years since my brother saw his best friend.
7. How long have you learned English?
8. We have lived here for fifteen years.
9. She hasn't visited me for five years.
10. I haven't written to my uncle since July.
11. We have become close friend for a long time.
12. Minh has collected stamps since 2000.

1) We haven't seen her since Christmas Day.
2) This is the first time I have eaten this kind of food.
3) It has rained for an hour.
4) The last time we visited my grandfather was two months ago.
5) I began studying English three years ago.
6) It's nearly five years since my brother saw his best friend.
7) How long have you learned English?
8) We have lived here for fifteen years.
9) She hasn't visited me for five years.
10) I haven't written to my uncle since July.
11) We have become close friend for a long time.
12) Minh has collected stamps since 2000.

cho mình xin cám ơn là đc rồi ^^