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 in two months ago.
5. I began studying English three years ago.
6. It's been nearly 5 years since the last time he saw his friend.
7. How long have you learned English?
8. We have lived here for fifteen year.
9. She hasn't visited me for five years.
10. I haven't written for my uncle since July.
11. We have become close friend for long time.
12. Minh has collected stamps since 2000.