2.way(方式，方法)后常用in which或that或how引导定语从句，也可省略：Do you know the way(in which/that/how) he worked out the problem?

1.situation后常用where,in which引导定语从句：Can you imagine a situation where/in

　 which you can use the word?

3． 当关系代词作“动词+介词”固定短语的宾语时，此时因定短语中的介词不能拆开移到关系代词前。例如：This is the watch which you´re looking for./He is a kind of man whom you can safely depend on.

2． 介词常受先行词的制约(即介词和先行词的搭配)，例如：He built a telescope through which he could study the skies.(through which 即through the telescope)

1． 介词的确定应依据定语从句中短语的习惯性搭配，例如：Who is the girl with whom you just shook hands?(shake hands with…是习惯性搭配)

2． 不用that的场合如下：

1)非限制性定语从句中　　 Last night ,I saw a very good film,which was about the Long

March .

2)介词放在关系代词之前时　 This is the man from whom I learnt the news

3)句中出现了that，或先行词是that时　　 I have found that which I was looking for.

1． 只用that引导和不用that引导的场合

1) 当先行词既包括人又包括物时：He talked about the men and the books that attracted

　 him.

2) 指物的先行词被any, every, only, very, all, no等修饰时：These are the very points that interest me./That´s the only watch that I like most.

3) 指物的先行词被序数词或形容词最高级修饰时：The first step that we are to take is very difficult./This is the second card that he gave me.

4) 先行词是指物的不定代词all,little,few,much,及everything,anything,nothing等时：There is still much that can be done about it./Have you got everything that you need?

5) 先行词是who时：Who that have seen him does not like him?

限制性定语从句和主句之间不用逗号分开，修饰主句中的某一个名词或名词词组或代

词；非限制性定语从句常用逗号和主句隔开，可以修饰主句中的某一个词，也可修饰整个句子。非限制性定语从句不能用that引导，引导非限制性定语从句的关系词不能省略。非限制性定语从句例：Li Ping´s father, who works in a factory, is an engineer./He tore up my photo, which made me very angry.(which指代主句内容，因前后两句是因果关系，此时which不可换为as。)

He is good at physics, as is known to us all.＝As is known to us all, he is good at physics.(as指代主句内容，在as is known/believed, as we all know/believe这类结构中as不可换为which)

2． 关系副词有：when(指时间)，where(指地点),why(指原因)，在定语从句中作状语。

例如：Would you suggest a time(when) we can have a talk?(when可省略)

The house where they live is not very large./This is the reason why he did not came to the meeting.

注意：不是表时间的先行词都用when引导定从，不是表地点的先行词都用where引导定从。例如：We´ll visit the factory which(＝that) makes radios.

(which或that在定从中作主语，where不可用主语，故不可用)

They still remember the happy days(which/that) they spent in Beidaihe.

(which或that在定从中作spent的宾语，when不可作宾语，故不可用)

定语从句是在复合句中修饰某一名词或代词的从句。被修饰的名词或代词叫做选行词，

而引导定语从句的词叫引导词，有关系代词和关系副词两类。

懂得什么样的先行词后用什么样的引导词是学好定语从句的关键。

1． 关系代词有：that,which,who,whom,whose,在定语从句中作主语、宾语中表语，whose

　 作定语。代人的有：who,whom,whose,that；代物的有：that,which,whose.例如：

　 The man who helped you is Mr White.(who代人，在定语从句中作主语)

　 That is the person(whom/who/that) you want to see.(whom,who,that代人，在定

　 语从句中作宾语，可省略)

　 I´m not the fool(that) you thought me to be.(that代人，在定从中作表语)

　 A dictionary is a useful book which(＝that) tells us the meaning of words(which

　 或that代物，在定从中作主语)