who,whom,that
這些詞代替的先行詞是人的名詞或代詞,who做主語指人,whom作賓語指人,that既可作主語又可作賓語（作賓語可以省略）,可以指人也可以指物.在從句中所起作用如下：(1) Is he the man who/that wants to see you?他就是想見你的人嗎?（who/that在從句中作主語） (2) He is the man whom/ that I saw yesterday.他就是我昨天見的那個人.（whom/that在從句中作賓語）
Whose 用來指人或物
(只用作定語,若指物,它還可以同of which互換,指人的時候也可以用of whom 代替） (1) They rushed over to help the man whose car had broken down.那人車壞了,大家都跑過去幫忙.(2) Please pass me the book whose (of which) color is green.請遞給我那本綠皮的書.
which,that
它們所代替的先行詞是事物的名詞或代詞,在從句中可作主語、賓語等,作賓語時可以省略,例如：(1) A prosperity which / that had never been seen before appears in the countryside.農(nóng)村出現(xiàn)了前所未有的繁榮.（which / that在句中作主語）