1 Yes, I have.
2 I have seen him 15 minutes ago.
3 I have been to London last month.
4 I have bought this jacket in the shop.
5 I have had my dinner at 5 o'clock.
6 No, I have not, I have lived in Moscow for 3 years.
7 I have come to the University so early, because I have studied very well at school.
8 I have read the text 4 times
9 I have already done a few exercise.