who, whose & whom

who係誰 例: Who was in the library?
whose係誰的 例: Whose book is this?
whom是誰 例: Whom does he talk to? (因為用左does)

who:

pron.
1. (用作疑問代名詞)誰,什麼人
Did Mary tell you who that girl's father is?
瑪麗有沒有告訴你那女孩的父親是誰?
Who has borrowed my pen?
誰借了我的鋼筆?
2. (用作限定關係代名詞)...的人
The girl who spoke is my best friend.
那講話的女孩是我最好的朋友。
3. (用作非限定關係代名詞)他;她;他們;她們
I went to the movies with Mary, who I think you once met.
我與瑪麗一起去看電影。我想你見過她。
4. 【古】(省略先行詞的關係代名詞)...的人

whose:

pron.(who或which的所有格)
1. (用作疑問代名詞)誰的
Whose books are these?
這些書是誰的?
2. (用作關係代名詞)那個人的,那些人的;他(她)們;他(她)們的
Chopin, whose works are world-famous, composed some of his music in this room.
蕭邦的音樂作品舉世聞名,其中的一部分就是在這間屋子裡創作的。
The woman whose umbrella you took is very angry about it.
你拿了那女士的傘,她為此很生氣。
3. (用作關係代名詞)它的;它們的
The word, whose meaning escapes me, probably derives from Latin.
那個詞可能源自拉丁文,其意思我想不起來了。

whom:

pron.(who的受格,用在正式的講話及書面語中)
1. (用作疑問代名詞)誰,什麼人
I know who you are and whom you represent.
我知道你是誰並代表誰。
2. (用作限定關係代名詞)...的人
I'll give my vote to the man in whom I have faith.
我將把我的選票投給我所相信的人。
She was the girl whom you met at the airport.
她就是你在機場遇見的那個女孩。
3. (用作非限定關係代名詞)他,她;他們,她們
My new neighbor, whom I introduced to you the other day, had a heart attack last night.
日前我介紹你認識的我那位新鄰居昨晚心臟病發作。
4. 【古】(省略先行詞的關係代名詞)...的人

who represents he she it , whose represents his her its , whom represents him her it

2006-10-17 18:10:32 補充：
who represents the subject whereas whom represents the object