句型转换。
1. They are doing housework. (改成一般疑问句)
______ they ______ housework?
2.Are the students cleaning the classroom? (作肯定和否定回答)
Yes, ______ _______.
No, _______ _________.
3.I’m playing the football in the playground. (对划线部分进行提问)
_______ _______you ______ the football?
4.Tom is reading books in his study. (对划线部分进行提问)
________ ______ Tom _______ in his study?