Câu tường thuật dạng câu hỏi Yes/No question:

S + asked (+ Sb) + if/whether + S + V

=> S + asked/wondered/wanted to know + if/whether + S + V

1. I asked him if he could drive

=> Can -> lùi về could

2. They wanted to know if i liked animals.

=> Thì HTĐ -> lùi về QKĐ

3. He asked me if i was willing to work on Saturdays.

=> Thì HTTD -> lùi về QKTD

4. Lan asked me if she was a teacher.

=> Thì HTĐ -> lùi về QKĐ

5. Paul said Mary if she could swim

=> Can -> lùi về could

6. She asked her son if he knew which was the cup he used

=> Thì HTĐ -> lùi về QKĐ

7. He asked me if it would rain tonight.

=> Will -> lùi về would

`1.` I asked him if he could drive

`2.` They wanted to know if I liked animals

`3.` He asked me if I was willing to work on Saturday?

`4.` Lan asked me if she was a teacher

`5.` Paul asked Mary if she could swim

`6.` She asked her son if he knew which the cup he was used 

`7.` He asked me if it would rain that night

*Yes - No question: S + asked + (O) + if/ whether + S + V

*Lùi thì:

Quá khứ đơn → Quá khứ hoàn thành

Hiện tại đơn → Quá khứ đơn

Hiện tại hoàn thành → Quá khứ hoàn thành

Hiện tại tiếp diễn → Quá khứ tiếp diễn

Quá khứ tiếp diễn → Quá khứ hoàn thành tiếp diễn

Hiện tại hoàn thành tiếp diễn → Quá khứ hoàn thành tiếp diễn

will → would

can → could

may → might 

must → had to

shall → should

be going to → was/ were going to