1. Mr. Jonh has visited to Vietnam several time
2. My brother has never drink wine before
3. I have never seen such a big python
4. Mrs. Thuy hasn't travelled by plane
5. Have you ever ridden the bycycle to school alone?- Yes, I have
6. Has she ever met movie star?- No, she hasn't
7. They have been to New York many times
8. We have never eaten Chinese food before
9. My mother has just sold the old motorbike
10. We have studied to this school for over 3 years
11. I can't get into the house because I have lose my keys
12. Mary has played the piano since she was 9