作业帮The students are cleaning the classrook(改为一般疑问句并作肯定和否定回答）
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The students are cleaning the classrook(改为一般疑问句并作肯定和否定回答）
are The students cleaning the classrook
yes,they are.
no,they aren't
Are the students cleaning the classrook?
Yes, they are
No ,they aren't