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定语从句:定语从句在句中作定语，用来修饰一个名词、名词词组或者代词。被修饰的名词、名词词组或代词叫做先行词；在先行词和定语从句之间起连接作用的词叫做引导词。引导词分为“关系代词”和“关系副词”。

关系代词有：who, whom, whose, that, which, as。

关系副词有：when, where, why。注意：关系副词里面没有how。

如果要修饰方式，用that或in which引导，或者不用引导词：

I don’t like the way (不用引导词.that, in which) he eyed me.我不喜欢他看我的那个样子。

1）定语从句关系代词：who（关系代词who在从句中主要作主语，在非正式语体里who还可以作从句中的宾语）

He is the man who wants to see you.

2）定语从句关系代词：whom（whom在从句中作宾语）

He is the man（whom）I saw in the park yesterday.

3）定语从句关系代词：whose（用来指人或物，只能用作定语, 若指物，它还可以同of which互换）。

Please pass me the book whose cover is green. （of which the cover/the cover of which）

4）定语从句关系代词：which（1）

which指物，在从句中作主语或宾语，作宾语时在非正式语体中可以省略。

They needed a plant which didn't need as much water as rice.

The farm (which) we visited yesterday is located in the suburb of Beijing. 4）定语从句关系代词：which（2）当在which和that面前进行选择的情况下，一般情况下要选which：

1.在非限制性定语从句中通常用which作引导词，而不能用that做非限制性定语从句的引导词。

2. 修饰整个主句。

I never met Julia again after that, which was a pity.

3. 修饰谓语部分。

He can swim in the river, which I cannot.

4.介词+ which

They are all questions to which there are no answers.

5）定语从句关系代词：that（1）that多用来指物，有时也可以用来

指人；在从句中作主语或宾语。指物的时候多用that，也可用which。It’s a question that (which) needs careful consideration.（指物，作主语。）

Who is the man that is reading a magazine under the tree?（指人，作主语。）

The girl (that) we saw yesterday is Tom’s sister.（指人，作宾语，可省略。）

定语从句关系代词：that（2）在以下的情况中，只能用that作引导词，而不能用which作引导词。

1.先行词为all , everything, anything, nothing, little等不定代词时。All(that)she lacked was training.

2.先行词被形容词最高级修饰时

This is the best film that I have ever seen.

3.先行词被序数词和the last修饰时

4.先行词中既有人又有物时

They talked about the teachers and the schools that they had visited. 5.主句是含有who或which的特殊疑问句，为了避免重复时

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