10. The sun (not to rise) yet, but the sky in the east is getting lighter every minute. 11. I (to see) you walking along the street the other day with a heavy bag. 12. I (not to read) the newspaper today. 13. It is very late, and trams (to stop) running: we must find a taxi to get home. 14. How many times you (to be) to St Petersburg? 15. At last I (to translate) this article: now I will have a little rest. 16. We (to go) to the country yesterday, but the rain (to spoil all the pleasure. 17. My watch was going in the morn-ing, but now it (to stop). 18. The lecture (not yet t-begin) and the students are talking in the classroom.

Решение:

1. The sun has not risen yet, but the sky in the east is getting lighter every minute.
2. I saw you walking along the street the other day with a heavy bag.
3. I am not reading the newspaper today.
4. It is very late, and trams have stopped running: we must find a taxi to get home.
5. How many times have you been to St Petersburg?
6. At last I have translated this article: now I will have a little rest.
7. We went to the country yesterday, but the rain spoiled all the pleasure.
8. My watch was going in the morning, but now it has stopped.
9. The lecture has not yet begun and the students are talking in the classroom.

Ответ: 10. has not risen; 11. saw; 12. am not reading; 13. have stopped; 14. have you been; 15. have translated; 16. went, spoiled; 17. has stopped; 18. has not yet begun.