题目内容
20．He went to school by bus yesterday．（改为一般疑问句）Did hego to school by bus yesterday？分析 昨天他乘坐公共汽车去上学．
昨天他是乘坐公共汽车去上学吗？
解答 答案：Did，go．根据给出的句子He went to school by bus yesterday，它为一般过去时态，句中的went为实意动词，把它变为一般疑问句需要用助动词did；后面的动词went用原形go；故填Did； go．
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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