LÀM BÀI: EXERCISE 29.3
Vui lòng đăng nhập và đăng ký (miễn phí) khoá học (EG2-A) English Grammar 2-A để nộp bài và xem kết quả.
Complete the sentences using might not have … or couldn’t have … .
B: Maybe. about it.
B: It’s possible. He to come.
B: No, the police say it an accident. It was deliberate.
B: Well, he very hard. I was in my office all day.
B: No, I’m not sure. He .