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.（改为一般疑问句并作否定和肯定回答）
人气：229 ℃ 时间：2019-08-20 14:44:20
解答
1Are they doing housework?They are not doing housework.
Are the students cleaning the classroom?.Yes,they are.
No,they aren't.
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