复制自某知道（作者 LaughterLand）：
当对划线部分作特殊疑问句提问时，如果划线部分是动词(非进行时语态)，则需要助动词(do does did等)
例如
1.He stands in front of me. (stands in front of me 划线)
Where does he stand? --->第三人称单数用does
2.We went to a party last night (went to a party)
Where did you do last night? ---->过去时
3 I'm making a cake at Tom's. (making a cake)
What are you doing at Tom's? ---->现在时
以上的提问的主体都是谓语+宾语（或者是不及物动词作谓语）
按照以上格式，陈述句是：
he tells you about it（he 划线）
who tells you about it ?
这是对主语的提问，是陈述句语序，故不需要助动词
如有疑问，请发私信给我，或追问，谢谢
who tells you about it ?这个特殊疑问句里怎么没有助动词的.
在特殊疑问句中，当疑问词作句子的主语时，不需要改变句子中的词序，还是主语（也是疑问词）在句首，所以没必要用助动词。只有疑问词对除主语外的其它成分提问时，才把系动词或情态动词提到主语前，或者另外添加助动词置于主语前。
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