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19.That is his sister.(改为一般疑问句)
Isthat his sister?

分析 那是他的姐姐.
那是他的姐姐吗?

解答 答案:Is,that.原句是含有be动词的陈述句,将be动词提前构成一般疑问句,故答案是Is,that.

点评 一、含有be动词(am/is/are/was/were)动词的一般疑问句,通常把be动词调到句首. 
二、含有情态动词(can/may/must/could)的一般疑问句,把情态动词调到句首.
三、句子里没有be动词、助动词、情态动词等,就需要加助动词do,does,、did(过去式)来构成疑问句,加上这些助动词后,句子中谓语动词必须用原形.  
其句型为:Do/Does/did+主语+动词原形+其它?

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