who同whom有咩分別呀？

Who和whom都是詢問人物的疑問詞，基本上who是問主語(subject)而whom是問賓語(object)。

Examples:
Q: Who has eaten the apple? A: Tom has eaten the apple. (要求的答案Tom是subject，所以用who問。)
Q: Whom are you talking to? A: I'm talking to Peter. (要求的答案Peter的object，所以用whom問。)

不過在現代英語中，用who比whom更普遍，即"Whom are you talking to?"多變成"Who are you talking to?"。

不過，在子句(clauses)中，whom卻不能被who取代。

Examples:
1. I will only tell the secret to that person. I can trust that person. --> I will only tell the secret to whom I can trust.
2. I have fallen in love with her. I met her in Bangkok last week. --> I have fallen with love with whom I met in Bangkok last week.

以上兩句，that person和her都是object，所以變成clause的時候用whom來指示。這些時候whom不能用who所取代。

quite well-explained.
but unfortunately, it's copied from others. rite?

who
[hu:]
pron.
誰, 那...的(人)

WHO
abbr.
世界衛生組織

who
[hu:]
pron.
(賓格whom; 所有格whose)
[疑問代詞]誰; 哪位
[連接代詞]誰
[限制性的關系代詞]...的人
[非限制性的關系代詞]他[她]; 他[她]們
[古][省略先行詞的關系代詞]...的人
W-is that?
那是誰?
He is a man who is of value to the people.
他是一個有益于人民的人。
Whom did you see?
你看見誰了?
That's the man who came to our house yesterday.
那就是昨天到過我們家來的人。
My cousin, who is a painter, is in Japan at present.
我的表哥是畫家, 他現在在日本。
Who breaks pays.
損壞者要賠。

who
n.
有關人物 the who and the why of it 與該事有關的人物及其發生的原因

who iswho(=who's who)
知道某一范圍內所有的人是誰(It took the new teacher a few days to remember who was who in the class. 這位新教師花了幾天時間記住班上學生的名字)
名[要]人, 有影響人士
Who's Who
名人錄, 名人詞典

WHO
=White House Office 白宮辦公廳[美];
World Health Organization 世界衛生組織










whom
[hu:m, hum]
pron.
誰

whom
[hu:m, hum]
pron.
(who 的賓格, 但在口語中常用who 代替)
[疑問代詞]誰
[關系代詞]...的人;...那些人; 他(她)們
[古][省略先行詞的關系代詞]...的人
Whom [Who]did you meet in the street yesterday?
昨天你在街上遇見了誰?
I don't know to whom I ought to address the request.
我不知道該向誰提出此項請求。
That is the man whom I met in Beijing last year.
他就是我去年在北京碰見的那個人。
My brother, whom you met the other day, has gone abroad.
前幾天你遇見過的我的那個兄弟, 出國去了。
whom(=those whom) the gods love die young.
[諺]神愛者去世早, 聰明者不長壽。

whom is　ｏｂｊｅｃｔ
ｗｈｏ　ｉｓ　ｗｈ－ｑｕｅｓｔｉｏｎ