Câu tường thuật - dạng Yes/No-questions 

S + asked / wanted to know / wondered + (O) +if/whether + S+ V (lùi thì)

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QKD ⇒ QKD / QKHT

will ⇒ would 

HTD ⇒ QKD

can ⇒ could 

if 1 ⇒ if 2 

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yesterday ⇒ the day before/ the previous day 

last ....⇒ the .....before / the previous ....

next ... ⇒ the next ... / the following ... 

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20. Hoa asked Hung if he had gone to the zoo with his sister the Monday before.

21. I asked Mai if she would phone me when she had free time.

22. I asked my mom if she had eaten chocolate which I had sent to her the day before.

23. Ba asked me if I would visit him and give him some presents in the next summer. 

24. I asked Nga if she came to the market to buy some apples for her mother.

25. Nam asked me if I had gone to the beach and bought some seafood the summer before.

26. I asked Hoa if she would give some new rules if she became a president.

27. Hoa asked Peter if he could take her to his house.

28. Mai asked me if I would go to the fountain the next Monday.

29. I asked Nam if he had had a party and invited lots of his friends the night before.

30. Đề sai 

`color{orange}{~MiaMB~}`

Answer:

`20.` Hoa asked Hung if he had gone to the zoo with his sister the previous Monday.

`21.` I asked Mai if she would phone me when she had free time.

`22.` I asked my mom if she had eaten chocolate which I had sent to her yesterday?

`23.` Ba asked me if I would visit him and give him some presents in the following summer.

`24.` I asked Nga if she came to the market to buy some apples for her mother.

`25.` Nam asked me if I had gone to the beach and bought some seafood the previous summer.

`26.` I asked Hoa if she would give some new rules if she became a president.

`27.` Hoa asked Peter if he could take her to his house.

`28.` Mai asked me if I would go to the fountain the next Monday.

`29.` I asked Nam if he had haven a party and invited lots of his friends the previous night.

`30.` Hình như đề sai.

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Câu tường thuật với câu hỏi Yes / No:

$\circ$ S `+` asked ( `+` O ) / wondered / wanted to know `+` if / whether `+` S `+` V ( lùi thì )

`-` Hiện tại đơn `->` Quá khứ đơn

`-` Hiện tại tiếp diễn `->` Quá khứ tiếp diễn

`-` Hiện tại hoàn thành `->` Quá khứ hoàn thành

`-` Quá khứ đơn `->` Quá khứ đơn / Quá khứ hoàn thành

`-` will `->` would

`-` can `->` could

`-` may `->` might

...

`+` today `->` that day

`+` tonight `->` that night

`+` next ... `->` the next ... / the following ...

`+` last ... `->` the last ... / the previous ...

`+` now `->` then

...