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    精英家教网 > 初中英语 > 题目详情
    7．They have to get up early every day．（改为一般疑问句）
    Dotheyhave to get up early every day？

    分析 他们不得不每天早起．
    他们不得不每天早起吗？

    解答 答案：Do they．have to为实意动词短语，意为"不得不"，此句为一般现在时，故其一般疑问形式必须借助助动词 do 或 does，这里主语是they，故借助于do，故答案是：Do they．

    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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