chuyển sang câu bị động

Here are the sentences converted into passive form: 1. A sudden increase in water pressure may break the dam. - The dam may be broken by a sudden increase in water pressure. 2. The book borrowed from the library must be taken. - The book borrowed from the library must be taken. 3. A man I know told me about it. - I was told about it by a man I know. 4. We can never find him at home for he is always on the move. - He can never be found at home because he is always on the move. 5. They use milk for making butter and cheese. - Milk is used for making butter and cheese. **Yes - No questions:** 1. Do they teach English here? - Is English taught here? 2. Will you invite her to your wedding party? - Will she be invited to your wedding party? 3. Did the teacher give some exercise? - Was some exercise given by the teacher? 4. Is she going to write a poem? - Is a poem going to be written by her? 5. Have they changed the window of the laboratory? - Has the window of the laboratory been changed by them? 6. Is she making a big cake for the party? - Is a big cake being made for the party by her? 7. Has Tom finished the work? - Has the work been finished by Tom? 8. Are the police making inquiries about the thief? - Are inquiries being made about the thief by the police? 9. Must we finish the test before ten? - Must the test be finished before ten? 10. Will buses bring the children home? - Will the children be brought home by buses? **Wh - question:** 11. When will you do the work? - When will the work be done by you? The book borrowed from the library must be taken or returned on time.