Ví du: Sabine has to leave now. Why does Sabine have to leave now? a. Eric had to lie (nói dối). » Why b. Mum has to buy three tickets. >>>How many c. I have to go to Los Angeles tomorrow. >> Where d. They will have to change their car. » Why e. Clara didn't have to go to school yesterday. ▶ When ? ? Hướng Nhớ thêm trợ c hợp theo thì t
