这主要是关于助动词do,did,does 的用法问题.
助动词后跟的是主要动词,语态和时态的变化由助动词(及do)承受,主要动词（这里是live）形态不变化,而第三人称主要体现在由do转为does,而后面的主要动词live保持原型.所以是where does he live而不是where does he lives.
where does he live 为什么不是 where does he lives?
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