Ответ: 1. What are you doing here? — I am preparing for my report. — How long have you
been prepareing for it? — Oh, I have been working since morning. 2. He had been teaching at school for five years when the war  broke out. 3. She has been studying English since last year. 4. What are you  reading? — I am reading a magazine. — How long have  you been reading it? — I have been reading it for half an hour. 5. She had lived in Moscow for ten years when her sister came to live with her. 6. Our teacher has
come. Now he is speaking with our monitor. 7. They were speaking when I looked
at them. 8. I had been walking for about an hour when I saw a little house not far
from the river. 9. When he had read the newspaper, he gave) it to his
brother. 10. He left for Rostov in 1990 and since then he has been living
there. 11. At this time tomorrow we will be discussing your report. 12. Now she is
reading the book which I gave her yesterday. 13. Have you ever been to London?
— Yes, I was there last summer. 14. What is your friend doing now? — She is
having dinner. She usually has dinner at this time. 15. I have bought a new
dress. I will show it to you tomorrow when youcome to my place. 16. So
you begin working tomorrow! And who will take care of your children when you
are done to work? 17. Hello, Peter! Where are you going? — I am going to the
library.