定语从句that与which区别

定语从句，是指一个句子跟在一个名词或代词（先行词）后进行修饰限定（对词句进行补充、修饰、限定，进而使原句内容更完整），就叫做定语从句。常用的关系词有that、which等。其中，定语从句that与which区别主要是在三个方面：意思不同、用法不同、侧重点不同。

which 引导定语从句时，先行词是物，在从句中可做主语、宾语、表语。that 引导定语从句时，先行词既可以是人+也可以是物，在从句中也可做主语、宾语、表语。更是在某些特定情况下，只能择一使用，切记不能用错！

一：在限制性定语从句中,只能用that不能用which：1）当先行词是指物的不定代词例：Do you have anything that you want to say for yourself?2）当先行词前面有下列词修饰时：the only,the very,just,any,every,some等例：This is the very busy that I’m waiting for.3）当先行词是形容词的最高级或先行词的前面有形容词最高级修饰时例子：This is the best that has been used against pollution.4）当先行词是序数词或前面有序数词修饰时例：The train is the last that will go to Suzhou.5）当先行词既有人，又有物例：Do you know the things and persons that they are talking about?6）当主句的主语是疑问词 who 或 which 时例：which is the bike that you lost?Who is the boy that won the gold medal?7）主句是there be句型且关系词在从句中作主语时例：there is a seat in the corner that is still available.二：当先行词指物，定语从句中只能用which不用that：1）在非限制性定语从句中，只能用 which2）当动词短语中的介词提前时，只能用 which

3）先行词后面有插入语时，只能用which.例：Here is the English grammar book which,as I’ve told you,will help you improve your English.4）先行词本身就是that时例：What’s that which flashed in the sky just now?

按语法句式，定语从句在整个句子中做定语的成分 。 被修饰的词叫先行词。定语从句不同于单词作定语的情况，它通常只能放在被修饰的词（即先行词）之后。定语从句由关系词（关系代词、关系副词）引导，关系代词、关系副词位于定语从句句首。