21. What is the reason for your buying such an expensive pair of shoes?

-> Lý do khiến bạn mua một đôi giày đắt tiền như vậy là gì?

22. Your car might have been stolen

-> S might have VPII

23. I love having my photograph taken by people

-> have sth VPII

24. I was advised to take an aspirin by her

-> S was/were VPII by O

25. Only when she is really hungry does she eat snacks between meals 

-> Chỉ khi thực sự đói, cô ấy mới ăn vặt giữa các bữa chính

21. What is the reason for your buying such an expensive pair of shoes?

`\text{Tạm dịch: Lý do bạn mua một đôi giày đắt tiền như vậy là gì?}`

22. Your car might have been stolen

`\text{S + might have  + Ved/V3}`

23. I love having my photograph taken by people.

`\text{S + having + sth + Ved/V3 + (by +O)}`

24. I was advised to take an aspirin by her.

`\text{QKĐ bị động: S + was/were + Ved/V3 + (by + O)}`

25. Only when she is really hungry does she eat snacks between meals 

`\text{Tạm dịch: Chỉ khi thực sự đói, cô ấy mới ăn vặt giữa các bữa chính.}`