Đáp án: + Giải thích các bước giải:

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

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

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

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

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

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

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

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

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

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

Câu `30)` Xem lại đề ạ

`@` Notes:

Câu gián tiếp:

`-` S + asked/ wanted to know/ wodered + if + S + V( lùi thì) + O

`-` S + asked  / wanted to know / wondered + (O) +WH + S+ V (lùi thì) + O

`-` Lùi thì: 

HTĐ `to` QKĐ

HTTD `to` QKTD

HTHT `to` QKHT

QKTD `to` QKHTTD

`-` Thời gian

today `to` that day

yesterday`to` the day before

tomorrow `to` the next/following day

next week`to` the following week

ago`to` before

`#Ph`

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

- Lùi thì của động từ: QKĐ -> QKHT

- Đổi trạng từ chỉ thời gian: last Monday -> the Monday before

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

- Lùi thì của động từ khuyết thiếu: will -> would

- Lùi thì của động từ: HTĐ -> QKĐ

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

- Lùi thì của động từ: QKĐ -> QKHT

- Đổi trạng từ chỉ thời gian: yesterday -> the day before

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

- Lùi thì của động từ khuyết thiếu: will -> would

- Đổi trạng từ chỉ thời gian: next summer -> the next summer

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

- Lùi thì của động từ: HTĐ -> QKĐ

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

- Lùi thì của động từ: QKĐ -> QKHT

- Đổi trạng từ chỉ thời gian: last summer -> the summer before

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

- Lùi thì của động từ khuyết thiếu: will -> would

- Lùi thì của động từ: HTĐ -> QKĐ

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

- Lùi thì của động từ khuyết thiếu: can -> could

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

- Lùi thì của động từ khuyết thiếu: will -> would

- Đổi trạng từ chỉ thời gian: next Monday -> the next Monday

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

- Lùi thì của động từ: QKĐ -> QKHT

- Đổi trạng từ chỉ thời gian: last night -> the night before

30. Sai đề

=> Câu tường thuật: Dạng Yes/No questions: S + asked sb/ wondered/ wanted to know + if + S + V(lùi thì)