Вопрос по английскому языку:

Correct mistakes
1. They were working in silence for 10 minutes
2. We used not to go to the country
3. When you will finish your homework, we'll go for a walk
4. I'm afraid I'm no understanding you
5. When have you bought it?
6. Sarah has rung me up just now
7. Judt asked me why I didn't come to his party
8. We'll move to anew flat next week
9. I forgot! I must phone my granny at once
10. While Mike did his homework his brother was playing