Câu tường thuật dạng Yes/No question: S + asked + (O) + if/whether + S + V

1. My aunt asked me if i could get coffee on the train.

=> Can -> Could

2. He asked her if they brought it round on a trolley.

=> Thì HTĐ -> lùi về QKĐ

3. My mother asked me if those exercises were difficult.

=> Thì HTĐ -> lùi về QKĐ ; these -> those

4. Jack asked Mai if she would leave HCM city the following day.

=> Will -> Would

5. Nam's mum asked him if he was reading books in his room.

=> Thì HTTD -> lùi về QKTD

6. She asked Mary if he had gone to the birthday party the previous night.

=> Thì QKĐ -> lùi về QKHT ; last night -> the previous night

7. Mary asked me if i could speak English.

=> Can -> Could

8. She asked Hoa if he might come to her party soon.

=> May -> Might

9. He asked me if she had breakfast.

=> Thì HTĐ -> lùi về QKĐ

10. Na asked Mai if she had learnt English at school for a long time.

=> Thì QKĐ -> lùi về QKHT

`1.` My aunt asked me if I could get coffee on the train

`2.` He asked her if they brought t round on a trolley

`3.` My mother asked me if those exercises were difficult

`4.` Jack asked Mai if she would leave HCM city the next day

`5.` My mum told Nam if he was reading books in his room

`6.` She asked Mary if he had gone to the birthday party the night before

`7.` Mary asked me if I could speak English

`8.` She asked Hoa if he might come to my party soon

`9.` He asked if she had breakfast 

`10.` Na asked Mai if she had learnt English at school for a long time

*Yes - No question:

S + asked + (O) + if/ whether + S + V_lùi thì

*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