I know whom he is looking for.

我知道他在找谁。

youdao

I know whom I have believed.

我知道我所信的是谁。

youdao

I know whom you mean, she is a newer.

我知道你说的是谁，她是新来的。

youdao

The speaker says: Before I built a wall I'd ask to know What I was walling in or walling out, And to whom I was like to give offense.

VOA: special.2011.04.17

I will randomly pair your form with another form and neither you nor your pair will ever know with whom you were paired.

我会随机把你们分成两两一组,你们不知道会跟谁分到一组

耶鲁公开课 - 博弈论课程节选

The prospect of hearing the Argentinian's comments on the lecture by the German with whom I had corresponded, but whom I did not know personally, was enough in itself to justify the price of the air fare to Buenos Aires (paid for on credit).

NPR: Excerpt: 'Borges and the Eternal Orangutans'

Of the top guys whom I know personally, I would say almost all are long-term greedy.

FORBES: The Benefits Of Being 'Long-Term Greedy'

And in no time, I got connected with proud owners, some of whom I did not know before, who shared their experiences and gave me all the information I needed to make a decision.

FORBES: When smart phones and smart friends go shopping together