1. Why should you have done it? 2. Have they cut the grass for hay? 3. She likes me to write that report. 3. They might have frightened the horse. 4. Someone must tell him not to go out in the rain. 5. You should paint it red and white. 6. Who wrote that letter? 7. They continued to use these machines. Câu 7 em làm là: " These machines were continued to use." có đúng không ạ??? help me!!!