What does he do？ 的意思是“他是做什么的？ 这是一般现在时句型，是英语中一般现在时的第三人称单数的特殊疑问句结构，即：疑问词+助动词does+主语+动词原型。
答案：A．考查系动词应用．结合题干"What---he doing"可推测句意为"他正在做什么"，句子强调正在进行的动作，句子的时态为现在进行时．"he"是第三人称单数，系动词用单数"is"．A．is系动词单 …
Learn how to use S for third person singular verbs in present simple tense with this guided discovery of grammar. Find out what he/she does, what his/her job is and where he/she …
本是一个关于英语语法的问题和回答，主要讨论了do系列和be动词的用法和区别。回答者从不同角度解释了为什么用does不用is，给出了一些例句和规律，还提供了相关的资料和链接。
What he does. What does he do? What he does is an incomplete sentence. It can not stand on its own. It may be part a sentence or a part of an indirect question. For example, you may …
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