Tìm và sửa lỗi sai
1.When he came , we studied EL
2.Her parents are working on the farm when we arrived
3.He buys a new car when he has enough money
4.At this time last night , I practiced speaking EL
5.Last night , she was listening to music
6.I have saw him for a long time
7.How long did you meet him ?
8.This is the first time I read the novel
9.It's 6 months since I have met him
10.He went swimming once a day