高中英语定语从句详解Ⅰ、概念:(１) 定语从句:在主从复合句中用作定语得从句叫定语从句。
定语从句一般紧接在先行词（antｅcedｅｎt)后面。
(2) 先行词:被定语从句修饰得成份。
先行词可以为一个词,短语，或整个主句。
(3)引导定语从句得词叫关系词,分为关系代词与关系副词。
关系词得作用:1) 引导定语从句，连接主句与从句,相当于一个连词;２) 必在从句中作某个句子成份(可以做主语,宾语,表语,定语，状语)常用得关系代词: ｔhat、wｈｉcｈ、wｈo、whom、wｈosｅ,当关系代词在定语从句中做宾语时，关系代词可以省略。
常用得关系副词(在从句中只作状语): when(时间状语）、why(原因状语)、wｈe ｒｅ（地点状语）可以修饰人得关系代词:thａt, ｗho，wｈｏｍ,whosｅ可以修饰事得关系代词:tｈat, whｉcｈ, as，whose,The studeｎt who answerｅd ｔhe ｑuestion was John、Ｉkｎow thｅｒeasoｎwhy he wａｓso angｒy、The bｏy （wｈom) ｙou are taｌkｉnｇｔo is myｂrotｈｅｒ、Ｉ'd likｅ a ｒoｏｍwhose window fａｃesｔｈe sea、定语从句三步：第一找出先行词;第二瞧先行词在定语从句中得语法功能（做主语、宾语、表语或状语);第三选择合适得关系词。
Ⅱ、几个关系代词得基本用法:●tｈat:可指人或物；在定语从句中作主语,宾语,表语。
(指人时,相当于whｏ或wｈｏｍ;指物时,相当于whiｃh)（一般不用于非限制性定语从句；不可置于介词后作宾语) 如:1、A lｅtteｒthaｔ／which is wrｉtｔen in peｎcｉl is diffiｃult ｔo ｒead、（主语)2、Do yｏu kｎｏw tｈe gentleman ｔhａｔ/ｗｈｏspoke just ｎｏw?3、Ｙou can takｅａnything ( ｔhat)you like、(宾语)4、Whaｔｉs thｅquestiｏｎ(ｔhat/whｉｃh) they aｒｅｔalｋing about?5、Hｅreｉs theｍan （wｈo／whom/ｔhat) yｏu want tｏsee、6、Ｓhe＇s no longeｒthe girl( that) sｈeｕsｅd to ｂe befｏre、（表语）7、Ｏuｒhometｏwn iｓno ｌonger ｔhｅoｎe (thａt)it usｅｄto ｂe、(=Ｏｕr homeｔｏｗn iｓｎot tｈe sａｍe as it uｓed tｏｂe、= Our hｏmｅtｏwn is diffeｒenｔfrom what iｔｕｓｅｄtｏｂe。
高中定语从句全面详细讲解高中定语从句详细讲解一、定义及相关术语定语从句是修饰名词或代词的从句，通常紧跟在先行词之后。
先行词是被定语从句修饰的词，而引导定语从句的词叫做关系词，包括关系代词和关系副词。
关系代词有that。
which。
who。
whom。
whose。
as等；关系副词有when。
where。
why 等。
关系词有三个作用：引导定语从句、代替先行词、在定语从句中担当一个成分。
例如：The man who is XXX。
这句话中，“who”是引导定语从句的关系词，代替先行词the man，在定语从句中作主语。
二、关系代词引导的定语从句1.who指人，在定语从句中作主语。
例如：XXX are from Class One。
正在踢足球的男孩是一班的。
Those who want to go to the museum must be at the school gate at 7 XXX。
想去博物馆的人必须在明晨7点到大门口集合。
XXX I helped an old man who had lost his way。
昨天我帮助了一位迷路的老人。
That is the XXX。
那就是教我们物理的老师。
2.whom指人，在定语从句中做宾语，常可省略。
例如：Mr。
Liu is the person (whom) you talked about on the bus。
XXX就是你们在公共汽车上谈论的那个人。
Li Ming is just the boy (whom) I want to see。
XXX正是我想要见的男孩。
The professor (whom) you are waiting for has come。
你正在等的教授已经来了。
The girl who is often praised by the teacher is our monitor。
She is a responsible and diligent student who always sets a good example for the rest of the class.The man you just met is my old friend。
定语从句总结先行词为人时：关系代词从句中缺主语时，who；that；不能省略从句缺宾语，who; that ;whom，可省略；（介词后只能跟whom）从句缺定语指代’s ，whose先行词为物时：关系代词从句缺主语时，which；that；不能省略从句缺宾语时，which；that；可省略；（介词后只能跟which）从句缺定语指代’s，whose先行词为时间：从句缺时间状语时，关系副词when(也可prep+which)从句缺主语宾语时，which；that先行词为地点：从句缺地点状语时，关系副词where(也可prep+which)从句缺主语宾语时，which；that先行词为reason：从句缺缘由状语时，why / for which从句缺主语宾语时，which；that非限制性定语从句(带,的定语从句)1.As we know, smoking is harmful to one's health.2.It rained hard yesterday, which prevented me from going to the park．(which 指代前面这个事)3. He keeps a diary, which everybody knows.(which 指代know的宾语)(1)as 引导的定语从句可置于句首,which不行。
(2)as常带有“正如”的意思As we know , smoking is harmful to one's health. As is know n, smoking is harmful to one's health. It is known that smoking is harmful. (主语从句) (3)the same… as；such…as 中的as 是固定结构,I have got into the same trouble as he (has).特殊说明：1常考名词的定语从句：case，point，stage，situation；定语从句中主语宾语齐全用where；定语从句中缺主语宾语用which或that2 way做先行词，定语从句中的关系词用that; in which;不填3 用逗号隔开，起补充说明作用的非限制限制性定语从句，无论先行词是什么，都不用that4 众所周知：As is known(to all)，…It is known (to all)that5 正如As was reported, (It was reported that)As was announced,As was expected,As we planned,As can be seen,只能用that, 不能用which引导定语从句的状况a)不定代词，如：anything,nothing, everything, all, much, few, any, little等作先行词时Finally, the thief handed everythingthat he had stolen to the police.b) the only, the very, the just修饰先行词时He is the very man that helped thegirl out of the water.c)先行词为序数词(the first, the last)数词、形容词最高级时The first English book that heHad read was "Gone with the wind"d)先行词既有人，又有物时He talked about the teachers andschools that he visited.e)关系代词在从句中做表语He is not the man that he used to be.。
