I just had no idea who he was.为什么不是whom

I just had no idea who he was.为什么不是whom
I just had no idea who he was.为什么不是whom

I just had no idea who he was.为什么不是whom
首先申明,这个句子中,既可以用who,也可以用whom.
本句翻译：我刚才不知道他是谁.
who 与whom 都可用作疑问代词,who 是主格,whom是宾格.
例如:Who saw the thief?谁看见了那个
Whom are you trying to fool?你想愚弄谁啊?
但是,在日常口语中,或者在不正式的场合中,常常用who 代替whom作宾语.
在上面那个例句中,也可以说Who are you trying to fool?
但是需要注意的是：who 不能直接用在介词后面.若直接用在介词后面,就必须用whom.
例如:To whom is she writing?她在给谁写信?
我的讲解你明白了吗?
欢迎交流,

定语从句~~who he was（这里缺的是表语 不是宾语）所以用who不用whom

因为这是同位语从句

因为在这个从句中，引导词who是句子中的表语而不是宾语，whom的作用是做句子的宾语。

would be wrong in your example; it should be who. The reason is that a relative pronoun functions as part of the relative clause, not of the main clause. Don't let the question mark fool you: who is a...

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would be wrong in your example; it should be who. The reason is that a relative pronoun functions as part of the relative clause, not of the main clause. Don't let the question mark fool you: who is a relative pronoun here, not an interrogative one.
Are you comfortable with [the person] who he is?
This shows the structure of your sentence a little better. The person, the hypothetical antecedent of the relative clause who he is, is left out or enclosed in the relative pronoun who. In any case, who is part of the relative clause, not the main clause. That is why we should be looking at its function within the subordinate clause: it is subject (or subject complement) in who he is; therefore we needwho, not whom.
It does not matter at all what function the (explicit or implicit) antecedent has in the main clause:
I fear him who gave me life.
I fear him whom I have wronged.
He who gave me life frightens me.
He whom I have wronged frightens me.
If who/whom is used as an interrogative pronoun, i.e. not introducing a subordinate clause, it is its function in the main clause that matters:
Who are you?
Whom do you see?
Note that who is now more frequent than whom in any case, and is accepted by most wherever traditionalists would have whom as explained above.

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