1. The last time we saw her was on Christmas Day
-> We have
2. I haven't eaten this kind of food before
=> This ia
3. It started raining an hour ago
=> It has
4. We haven't visited may grandparents 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. Jane ia as tall as her older sister
=> Jane ia
9. There houses are not as large as those houses
=> Those houses
10. Your backpack is not the same as mine
=> My backpack
11. Ba began collecting stamps three years ago
=> Ba has
12. We started living here twenty years ago
=> We have
13. It's five years since I last saw Nam
=> I haven't
14. The last time she visited us was four months ago
=> She hasn't
15. I know Susan, I first met her in 2006
=> I have
16. Minh has a digital camera. He bough it in 2001
=> Minh has had
17. Mai plays the piano. She started when she was ten years old
=> Mai has
18. Barbara is in Ha Noi now. She arrived there five months ago
=> Barbara has
19. They started living here last month
=> They have
20. My shoes are different from yours
=> My shoes