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【答案】1. She is opening the window now. 2. Who is cleaning the window? 3. She is not closing the door now. 4. I am doing my homework. 5. They are singing under the tree now.
【解析】
1. she她, the window窗户, open开, 现在分词是opening ,now现在,本句主语是第三人称单数,be用is,根据所给的句号,可知句子是一个陈述句,根据所给词义可以连成句子:她现在在开窗户。故答案为 She is opening the window now.
2. is是, who谁, the window窗户, cleaning正在擦,根据所给的问号,结合词义,可知句子是一个特殊疑问句:谁正在擦窗户?故答案为 Who is cleaning the window?
3. 句意:她正在关门。本句是现在进行时,变否定句,在is后面接not,句意为她现在没在关门。故答案为 She is not closing the door now.
4. 句意:你在做作业。主语是第一人称I我,be用am,句意为我正在做作业。故答案为 I am doing my homework.
5. they他们, the tree树, sing唱,现在分词是 singing 正在唱, now现在, under在下面,根据所给的句号,可知句子是一个陈述句,根据所给词义可以连成句子:他们现在在树下唱歌。故答案为 They are singing under the tree now.