1. Our teacher wants us to prepare our lessons carefully.
Answer: Our lessons are wanted to be prepared carefully by our teacher.
Explanation: The sentence is rewritten in the passive voice by focusing on "our lessons" as the subject.
Dịch: Các bài học của chúng tôi được yêu cầu chuẩn bị cẩn thận bởi giáo viên của chúng tôi.

2. They expected me to finish my work early.
Answer: I was expected to finish my work early by them.
Explanation: The subject "I" becomes the object in the passive sentence, maintaining the original meaning.
Dịch: Tôi được kỳ vọng hoàn thành công việc sớm bởi họ.

3. Is she making big cakes for the party?
Answer: Are big cakes being made for the party by her?
Explanation: The question is converted to the passive form while keeping the interrogative structure.
Dịch: Những chiếc bánh lớn đang được làm cho bữa tiệc bởi cô ấy phải không?

4. The house needs cleaning.
Answer: The house needs to be cleaned.
Explanation: The sentence is rewritten to express the same meaning in a more formal passive structure.
Dịch: Ngôi nhà cần được dọn dẹp.

5. It was impossible to preserve river water in the past.
Answer: River water was impossible to be preserved in the past.
Explanation: The passive voice emphasizes the difficulty in preserving river water in the past.
Dịch: Nước sông đã không thể được bảo quản trong quá khứ.

6. He made me stay outside yesterday.
Answer: I was made to stay outside yesterday by him.
Explanation: The causative verb "made" is transformed into the passive form "was made to."
Dịch: Tôi bị buộc phải ở bên ngoài hôm qua bởi anh ấy.

7. The teacher let us go home early last week.
Answer: We were allowed to go home early last week by the teacher.
Explanation: The verb "let" changes to "were allowed to" in the passive voice.
Dịch: Chúng tôi được phép về nhà sớm tuần trước bởi giáo viên.

8. He had the waiter carry the luggage home.
Answer: He had the luggage carried home by the waiter.
Explanation: The focus shifts to the luggage in the passive voice.
Dịch: Anh ấy yêu cầu hành lý được mang về nhà bởi người phục vụ.

9. I got the postman to post the letter for me.
Answer: I got the letter posted by the postman for me.
Explanation: The passive form emphasizes the action done by the postman.
Dịch: Tôi đã nhờ bưu tá gửi lá thư cho tôi.

10. Turn on the lights!
Answer: Let the lights be turned on!
Explanation: The imperative sentence is converted to the passive form by adding "Let."
Dịch: Hãy bật đèn lên!

11. They know that English is an international language.
Answer: English is known to be an international language.
Explanation: The passive form focuses on English and maintains the same meaning.
Dịch: Tiếng Anh được biết đến là một ngôn ngữ quốc tế.

12. Don't do that silly thing again.
Answer: Don't let that silly thing be done again.
Explanation: The passive form emphasizes the action not being done.
Dịch: Đừng để việc ngớ ngẩn đó được làm lại.

13. We'll continue to use this phone.
Answer: This phone will continue to be used by us.
Explanation: The passive form focuses on the object "this phone."
Dịch: Chiếc điện thoại này sẽ tiếp tục được sử dụng bởi chúng tôi.

14. Did people make jeans two hundred years ago?
Answer: Were jeans made two hundred years ago?
Explanation: The question is rewritten in the passive voice.
Dịch: Quần jeans đã được sản xuất cách đây 200 năm phải không?

15. They opened the road 10 years ago.
Answer: The road was opened 10 years ago by them.
Explanation: The passive form emphasizes the action of opening the road.
Dịch: Con đường đã được mở cách đây 10 năm bởi họ.