题目内容
2．I'm doing my homework．（改为一般疑问句）Areyoudoing your homework？
分析 我正在做作业．
你在做作业吗？
解答 答案：Are，doing．原句是现在进行时be+doing，将be动词提前构成一般疑问句，第一人称转换成第二人称you，故are，故答案是Are，doing．
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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