Who is that man? 那人是谁?
Who called during my absence? 我不在时有谁来了?
Who goes there? 什么人?(哨兵喝问用语)
Who would have thought it? 谁想得到呢?
Whom [【口】 Who] do you mean? 你指的是谁?
You met whom [【口】W who]? 你遇到了谁?
With whom?=【口】 Who with? 和谁在一起?

I don't know who he is. 我不知道他是谁.
I inquired who he was. 我问他是谁.
I don't care [It doesn't interest me] who will be elected. 我不在乎谁当选.
I told him whom [【口】 who] to look out for. 我告诉了他应提防谁.
who's who
Who's Who.

A gentleman is a man who speaks the truth [a man (whom [【口】 who]) you can trust, a man on whom you can rely, a man whose word is as good as his bond]. 绅士是说真话的人[可相信的人,言而有信的人].

I sent it to Jones, who (=and he)passed it on to Smith. 我把它递给了琼斯,琼斯把它递给了史密斯(这个who不能省略).

You may invite who [whom] you like. 你可随便邀请什么人.
To whom it may concern. 致有关人员,执事先生台启(通知的开头语).

Who is not for us is against us. 不赞成我们的都是反对我们的.
Whom the gods love die young. 【谚】 神所爱的人多夭折(好人不长寿).