三、句型转换：
1. They are doing housework .(分别改成一般疑问句和否定句) ______________________________________________________________________________________________________________________
2．The students are cleaning the classroom . ( 改一般疑问句并作肯定和否定回答)
___________________________________________________________ ___________________________________________________________
3．I’m playing the football in the playground .(对划线部分进行提问) ___________________________________________________________
4．Tom is reading books in his study . (对划线部分进行提问)
___________________________________________________________
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