The students are cleaning the classroom.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 classroom.改为一般疑问句并作肯定和否定回答..

The students are cleaning the classroom.改为一般疑问句并作肯定和否定回答..
The students are cleaning the classroom.
改为一般疑问句并作肯定和否定回答..

The students are cleaning the classroom.改为一般疑问句并作肯定和否定回答..
Are the students cleaning the classroom?
Yes, they are.
No, they aren't.