WHO 可以做主語,又可以做賓語
WHOM只能做賓語
例子：1,who are you?不能是whom are you?
2,This book belongs to whom/who?兩者都可以
一.定語從句及相關(guān)術(shù)語
1.定語從句：修飾一個(gè)名詞或代詞的從句稱為定語從句,一般緊跟在它所修飾的先行詞后面.
2.關(guān)系詞：引導(dǎo)定語從句的關(guān)聯(lián)詞成為關(guān)系詞
關(guān)系詞有關(guān)系代詞和關(guān)系副詞.關(guān)系代詞有that,which,who,whom,whose,as等；關(guān)系副詞有where,when,
why等.
關(guān)系詞常有3個(gè)作用：1,引導(dǎo)定語從句.2,代替先行詞.3,在定語從句中擔(dān)當(dāng)一個(gè)成分.
二.關(guān)系代詞引導(dǎo)的定語從句
1.who指人,在從句中做主語
(1) The boys who are playing football are from Class One.
(2) Yesterday I helped an old man who lost his way.
2.whom指人,在定語從句中充當(dāng)賓語,常可省略.
(1) Mr.Liu is the person (whom) you talked about on the bus.
(2) Mr.Ling is just the boy whom I want to see.
注意：關(guān)系代詞whom在口語和非正式語體中常用who代替,可省略