一、关系代词who, whom, whose, which, that引导定语从句的基本用法:
三者都可指代人: who作主语, whom 作宾语, that既可以作主语, 又可作宾语，
He is a good teacher who/that is loved by all.
Here is the man (whom) you are looking for.
注意: ①在口语中, who 可以代替whom作宾语。②关系代词在定语从句中作宾语时, 一般可省略。
2. whose 可修饰人,也可修饰物; 修饰物时, 可与of which换用,whose在定语从句中作定语。如:
I saw some trees whose leaves were black with diseases.
= I saw some trees the leaves of which were black with diseases.
3. that/which/that/which指代物, 在定语从句中可作主语或宾语。如:
Emei is a wonderful place which/that is worth visiting.
The film (which/that) we saw last night is wonderful.
1. 常用that 不用which的情况:
① 先行词为all, anything, everything, nothing, something等时，如:
I will do all (that) I can to help you.
② 先行词被序数词、形容词最高级或the only, the very等所修饰时。如:
He was the only person that joined the army in his village that year.
They talked about the people and the things (that)they remembered in the school.
④ 当主句是以who 或which开头的疑问句时, 定语从句用that 引导, 以避免重复。如:
Who is the boy that was here just now?
2. 若被修饰的名词充当从句介词宾语时, 介词可提前于引导词之前,此时的引导词只能用whom 或which。如:
The pencil with which he was writing broke.
3. 当先行词为way时,其后的定语从句用in which或 that引导,也可不用引导词。如:
I don’t like the way (in which/that) he talks to me.