题目内容
15．That is my grandfather．（改为一般疑问句）Is thatyour grandfather？
分析 那是我的爷爷．
那是你的爷爷吗？
解答 答案：Is； your．原句是含有be动词的肯定句，将be动词提到句首构成一般疑问句，my换成your，故答案是Is，your．
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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