關系代詞的用法 (1) 如果先行詞是all, much, anything, something, nothing, everything, little, none等不定代詞，關系代詞一般只用that，不用which。例如：
All the people that are present burst into tears.
(2) 如果先等詞被形容詞最高級以及first, last, any, only, few, mush, no, some, very等詞修飾，關系代詞常用that,不用which, who，或whom。例如：
(3) 非限制性定語從句中，不能用關系代詞that,作賓語用的關系代詞也不能省略。例如：
There are about seven million people taking part in the election, most of whom、are well educated.
(4) which還有一種特殊用法，它可以引導從句修飾前面的整個主句，代替主句所表示的整體概念或部分概念。在這種從句中，which可以作主語，也可以作賓語或表語，多數情況下意思是與and this 相似，并可以指人。例如：
He succeeded in the competition, which made his parents very happy.
(5) that可指人或物，在從句中作表語，（指人作主語時多用who）僅用于限制性定語從句中。
(6) which可作表語，既可指人，以可指物。指人時，一般指從事某種職業或是有種特征．品性或才能的人。Which引導的定語從句可以限制性的，也可以是非限制性的。
(7) 如果作先作詞的集體名詞著眼于集體的整體，關系代詞用which;若是指集體中的各個成員，則用who。
(8) 先行詞有兩個，一個指人，一個指物，關系代詞應該用that。例如：
The boy and the dog that are in the picture are very lovely.
(9) 如果先行詞是anyone, anybody, everyone, everybody, someone, somebody,關系代詞應該用 who 或whom，不用 which。例如：
Is there anyone here who will go with you?
