1. When I was looking out of the window, I saw John.
2. Have you ever played the piano since you left school?
3. I haven't seen him for two days.
4. When he was trying to open the door, he dropped his key.
5. They have been living in this house since 1987.
6. My father was washing his car while my mother and I were preparing dinner.
7. Did you meet her yesterday?
8. Mary has been in London for three days.
9. The headmaster entered the classroom when they were writing their exams.
10. He bought a new car last week.
11. I think that they will arrive tomorrow morning.
12. Last Wednesday they played chess after they had done their homework.
1A, 2B, 3C, 4A
Объяснение:
проверено:)