三、句型转换：
1.They are doing housework .(分别改成一般疑问句和否定句)
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2．The students are cleaning the classroom .( 改一般疑问句并作肯定和否定回答)
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人气：199 ℃ 时间：2020-05-14 02:03:59
解答
1 Are they doing housework?
They aren't doing housework.
2 Are the students cleaning the classroom?
yes,they are./No,they aren't.
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