с английским. условные предложения!​

ответ: учи английский!

Объяснение:

1) A sound of piano is heard in the hall by us.

2) This book was bought by me a week ago.

3) These letters have already been brought by the secretary.

4) They went home after the work had been finished by them.

5) This problem is being examed by our scientists now.

6) He was taught English by my mother.

7) Her brother was sent a telegram by me.

8) My sister is always taken care of by my friends.

9) He is always laughed at by his friends.

10) This house has never been lived in by us.

1. He has just ( finished) his work. 2. Have you ( made) any spelling mistakes in your dictation? 3. What books did you ( read) when you ( lived) in the country? 4. They (have not yet come) from the south. 5. He (was) ill last week, but now he (has recovered). 6. If everybody (has read) this new novel, let's discuss it. 7. Have you ( booked) tickets? — Yes, I have. I ( booked) them several days ago. 8. I (have not  seen) you since you ( left) for Moscow. 9. Have you ( read) all the books on this shelf? 10. I (have not seen) my cousin since last year. 11. Why did you ( put) these things in the wrong place? 12. Why have you ( left) the door open?