对人提问的特殊疑问句有两大类
1、如果对主语提问，疑问句中不需要助动词，如：
Who served you?
Who left? 谁离开了?
2、如果是对宾语或定语提问，疑问句中必须要加助动词，如
Who/whom did you see? 你看见谁了?
Whom/Who does he always with? 他总和谁在一起？
Whose mother did not arrive that day? 谁的母亲那天没到？
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