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1. He has written 5 books and one of them is especially interesting.
2. President has just finished the speech. 
3. Yesterday by 3 o'clock we had finished discussion of the program and next 2 hours we were watching the new film.
4. Recently, I've got the position of a manager in the large Company. I study English after work and hope to go to business trip to London.
5. Have you seen a doctor?
6. Yes. He has just come and he is in his office right now.
7. Tests have proved that lack of sleep can harm your health.
8. She has never studied English.
9. I've been here since Christmas.
10. I've known here for 10 years.
11. He told me that his sister has gone to St. Petersburg.
12. They will have bought a new car till the end of October.
13. We have solved this problem.
14. I haven't finished reading that book yet, but I will have finished by the weekends.
15. Where have you just been?
16. You had known him before you met him yesterday.
17. He will have finished the speech before the audience leaves the room.
18. Nikolay had fixed the TV set yesterday, by 5 p.m.
19. Will you brother have come by the time you get a new flat?
20. Hurry up! The taxi has already arrived.