Ответ:
1. I was watching TV from 7 to 9 p.m. yesterday.
2. He didn't go to the Academy the day before yesterday.
3. The newspapers are brought every day.
4. She has just come
5. Have you ever written letters abroad?
6. Don’t enter this room! Students of economics department are being examined there.
7. I will go to Great Britain if my mother gives me money.
8. Ann had done her homework before her parents came.
9. My father will come back from his business trip next week.
10. She visits her parents every weekend.
11. Look! Our monitor is speaking to the dean.
12. Our teacher always speaks English at the lesson.
13. The scientists has discovered this star this year.
14. She has just written a letter to her granny.
15. Soon I will not depend on my parents.
16. I had finished cooking by the time my aunt comes home.
17. I can’t give you this article. It is being translated by my students now.
18. I entered the Academy 4 months ago.
19. The house will have been built by my father by July of the next year.
20. He didn't see the rector yesterday.