1. We haven't seen her since Christmas day.
2. This is the first time I have (ever) eaten this kind of food.
3. It has been an hour since it rained.
4. The last time we visited my grandfather was two months.
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 learnt English?
8. We have lived here for fifteen years.
9. She hasn't visited me for five years.
10. I haven't write to my uncle since July.
11. We have become close friend for a long time.
12. Minh has collected stamps since 2000.
