TÌM VÀ SỬA LỖI SAI 1. I don’t must do my homework tonight. 2. Does he should help his mother with housework ? 3. You don’t ought to do that.I will to do that for you. 4. She doesn’t must go home now. 5. We must to work hard to please our parents. 6. Can your brother sings ? 7. Why shouldn’t we to give them a hand ? 8. When I was young , I could playing the guitar very well. 9. I can stay in bed tomorrow morning because I mustn’t go to work. 10.I don’t know why didn’t you answer the teacher’s question.