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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 have not  read 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 shall have a little rest.
7. We went to the country yesterday, but the rain  spoilt all the pleasure.
8. My watch was going in the morning, but now it has stopped.
9. The lecture has not  begun yet and the students are talk­ing in the classroom. 
10. She has just  gone out.
11. She left the room a moment ago.
12. We have not  solved the problem yet.
13. When did it all happen?
14. The morning was cold and rainy, but since ten o'clock the weather has changed and now the sun is shining brightly.
15. Show me the dress which you have  made.
16. Oh, how dark it is! A large black cloud has covered the sky. I think it will start raining in a few minutes.
17. Oh, close the window! Look, all my papers have  fallen on the floor because of the wind.
18. When did you open the window? — I  opened it ten minutes ago