IV. Rewrite the sentences:
1. The last time we saw her was on Christmas day.
We haven't .............................................................................................
2. I haven't eaten this kind of food before.
This is .............................................................................................
3. It started raining an hour ago.
It has .............................................................................................
4. We haven't visited my grandfather for two months.
The last time .............................................................................................
5. I have studied English for three years.
I began .............................................................................................
6. My brother hasn't seen his best friend for nearly five years.
It's .............................................................................................
7. When did you start learning English?
How long .............................................................................................
8. We started living here fifteen years ago.
We have .............................................................................................
9. The last time she visited me was five years ago.
She hasn't .............................................................................................
10. I last wrote to my uncle in July.
I haven't .............................................................................................
11. It's long time since we became close friend.
We have .............................................................................................
12. Minh began to collect stamps in 2000.
Minh has .............................................................................................