5.It's over 20 years since he last went back to his village.
*Vì $V_{2}$ của been là was/were, mà was/were trong trường hợp này nghĩa không ổn lắm, nên mình nghĩ đổi thành went sẽ hay hơn.
6. The boys found the journey to the village very interesting.
*Xem lại đề, chủ ngữ sai.
7. We haven't gone to a cinema for 2 years.
8. She has lived here since she was five
9. I last saw him in 1990.
10. I started cooking for the party 3 hours ago.