题目内容
12．Jack has breakfast at home．（ 改为一般疑问句）Does Jackhave breakfast at home？
分析 杰克在家吃早饭．
解答 答案：Does，have．上文含有实意动词have，主语Jack三单，故借助于助动词does构成一般疑问句，后加动词原形have，故答案是Does，have．
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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