He has a headache.变疑问句Does he have a headache.what does he have..为什么用have不用has? 连成句子1.should，go，not，today，you，...

he has a headache Q:does he have a headache Q:What does he have? N:he doesn't have a headache.

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1.You should not go out today.
2.Does he have a headache?

在陈述句中 He是第三人称单数，所以动词have要用三单形式has，在疑问句中，因为主语是三单He，所以用助动词Does帮助行为动词have构成一般疑问句，而陈述句中表示的是一般现在时，没有时态的变化，所以疑问句中的动词还原成have。

疑问词does已经是第三人称了，后面动词就用原型

因为句中引入了助动词does，其后要用动词原型。也可以理解助动词已经发生了三单变化了，动词要还原。

因为句中引入了助动词does，其后要用动词原型。

因为用了does，所以have用原形

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