I . Correct one mistake in the following sentences 1. When a boy, Tom often plays tennis. 4. I was working really hard in my office yesterday when the electricity is out 5. For the past two years I did a lot of things. 6. Mary was making a dress when she cuts her finger. 7. Mary never went to bed before she has finished her homework. 8. The last time I have seen him was in 1999. 9. Last week, when the police came there, the thief went away. 10. Peter and Wendy first met in 2006, and they are married for three years now. Giúp mik vs,cần gấp ạ,mn tìm lỗi sai và sửa ,nếu có thể thì ghi dựa vào j mà sửa như vậy ạ