Present Perfect или Past Simple. 1. The sun (not to rise) yet, but the sky in the east is getting lighter every minute. 2. I (to see) you walking along the street the other day with a heavy bag. 3. I (not to read) the newspaper today. 4. It is very late, and trams (to stop) running: we must find a taxi to get home. 5. How many times you (to be) to St. Petersburg? 6. At last I (to translate) this article: now I shall have a little rest. 7. We (to go) to the country yesterday, but the rain (to spoil) all the pleasure. 8. My watch was going in the morning, but now it (to stop). 9. The lecture (not yet to begin) and the students are talking in the classroom. 10. She just (to go) out. 11. She (to leave) the room a moment ago. 12. We (not yet to solve) the problem. 13. When it all (to happen)? 14. The morning was cold and rainy, but since ten o'clock the weather (to change) and now the sun is shining brightly. 15. Show me the dress which you (to make). 16. Oh, how dark it is! A large black cloud (to cover) the sky. I think it will start raining in a few minutes. 17. Oh, close the window! Look, all my papers (to fall) on the floor because of the wind. 18. When you (to open) the window? — I (to open) it ten minutes ago.

1. The sun hasn't 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 haven't 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 spoiled all the pleasure.

8. My watch was going in the morning, but now it has stopped.

9. The lecture hasn't 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 haven't 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.

Объяснение:

Past Simple – это время, с его мы сообщаем о действии или событии, которое закончилось в (даже если это произошло всего пару секунд назад), и время события ясно из предложения либо его легко установить по смыслу/из ситуации.

Present Perfect – настоящее время, оно указывает на действие или событие, которое началось в и к настоящему моменту еще не закончилось или закончилось, но имеет связь с настоящим. Время выполнения действия нам чаще всего неизвестно или неважно, а важен результат!

Подчёркнутые в предложениях слова являются маркерами определить, какую форму выбрать.