giải giúp mình ạ bị động

Dưới đây là câu trả lời cho bài tập viết câu bị động từ những câu đã cho:

1. The money was added up by us and it was found to be correct.
2. A dress is being asked to be taken by a tailor.
3. A terrible mistake seems to have been made by someone.
4. Dinner is to be cooked by you today.
5. What is known by people is his name.
6. The gun was picked up by someone.
7. It was understood by us that he lived in town last year.
8. This has not needed to be done by us.
9. He likes to be called "Sir."
10. This button must not be switched by anyone.
11. It will have to be shown to someone.
12. It is only right to be laughed at by him now.
13. You are not needed to wind the watch.
14. The library is decided to be opened next month.
15. Printing was invented by people before.
16. The Government was urged to lower income tax.
17. The selling of alcohol at football matches is suggested.

Những câu trên đã biến đổi thành câu bị động, chú ý vào cấu trúc chủ - động và sử dụng đúng thì cho các động từ. Câu bị động thường sử dụng "be" + quá khứ phân từ của động từ, và người thực hiện hành động có thể được bỏ qua nếu không cần thiết.