19.That is his sister.(改為一般疑問句)
Isthat his sister?

分析 那是他的姐姐.
那是他的姐姐嗎?

解答 答案:Is,that.原句是含有be動詞的陳述句,將be動詞提前構(gòu)成一般疑問句,故答案是Is,that.

點評 一、含有be動詞(am/is/are/was/were)動詞的一般疑問句,通常把be動詞調(diào)到句首. 
二、含有情態(tài)動詞(can/may/must/could)的一般疑問句,把情態(tài)動詞調(diào)到句首.
三、句子里沒有be動詞、助動詞、情態(tài)動詞等,就需要加助動詞do,does,、did(過去式)來構(gòu)成疑問句,加上這些助動詞后,句子中謂語動詞必須用原形.  
其句型為:Do/Does/did+主語+動詞原形+其它?

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