reason在定语从句中的用法
when引导的定语从句的用法
when/where/why引导的定语从句的用法when， where， why属于关系副词，都在其引导的定语从句中充当状语，其具体用法如下：1. 关系副词 when引导定语从句（包括限定性定语从句和非限定性定语从句）修饰表示时间的先行词，在定语从句中充当时间状语。
例如： I still remember the day when I first met Jennifer.我仍然记得第一次见到詹妮弗的那一天。
// Next month, when you’ll spend your summer holidays in your hometown, is approaching. 下个月即将来临，届时你们将在家乡度暑假。
2. 关系副词where引导定语从句（包括限定性定语从句和非限定性定语从句）修饰表示地点的先行词，在定语从句中充当地点状语。
例如： This is the office where he worked. 这就是他工作过的办公室。
// She is going to live in Macao, where she has some close friends. 她要到澳门去定居，在那里她有几个密友。
3. 关系副词why引导限定性定语从句修饰先行词reason，在定语从句中充当原因状语。
例如： I don’t know the reason why he came so late. 我不知道他来得那么晚的原因。
// That is the reason why I don’t want to go. 那就是我不想去的理由。
// He didn’t tell me the reason why he was so upset.他没有告诉我他为什么那样心烦意乱。
注意：关系代词与关系副词之间并非毫无关联，两者之间存在密切的联系。
在备考中尤其要注意以下几点：1. 很多情况下关系副词用“介词＋which/whom”来代替，其中的介词由先行词或定语从句中谓语动词的形式来决定，例如：The day when I met the famous pop star was the greatest day of my life.= The day on which I met the famous pop star was the greatest day of my life.见到这位著名歌星的那天是我一生中最重要的日子。
通过高考题精讲定语从句中先行词是reason不用why
通过高考题精讲定语从句中先行词是reason不用why(2002上海春)Is this the reason __________ at the meeting for his carelessness in his work?A. he explainedB. what he explainedC. how he explainedD. why he explained解析：选A. 本题是个定语从句。
Is this the reason __________ at the meeting for his carelessness in his work?A. he explainedB. what he explainedC. how he explainedD. why he explained现改成陈述句：This is the reason_________ at the meeting for his carelessness in his work.先行词是the reason, 所以我们第一想到关系副词why。
但是关系词在定语从句中，却用作宾语：he explained the reason，这样我们应该用关系代词。
可是本题却没有that，或是which，因为作宾语，可以省略，所以本题可以改成这样：This is the reason that/which he explained a t the meeting for his carelessness in his work.=This is the reason he explained at the meeting for his carelessness in his work.意为：这就是他在会上为工作粗心而解释的原因。
定语从句的用法
定语从句的用法定语从句，一个简单句跟在一名词或代词后(先行词)进行修饰限定，所以叫做定语从句。
在主句中充当定语成分。
那么你知道定语从句的用法吗?下面跟着店铺一起来学习一下，希望对大家的学习有所帮助!一、基本概念：在复合句中，修饰某一名词或代词的从句叫定语从句。
如：Do you know the man who spoke at the meeting just now?That is the house where he lived ten years ago.定语从句所修饰的词叫先行词;定语从句一般用关系代词或关系副词来引导，关系词放在先行词与定语从句之间起连接作用，同时又作从句中的一个成分。
引导定语从句的关系代词有：that, who, whom, whose, which;关系副词有：when, where, why.二、关系词的用法：(一)关系代词的用法：1. 作主语用who, which和that, 如：He is the man who/that lives next door.The train which/that has just left is for Shenzhen.2. 作宾语用whom, who, which, that, 如：The man (whom/who/that) we have just seen is a famous writer.Where is the book (which/that) I bought last week?注：在非正式文体中，用于指人的关系代词who whom, that 通常可以省略，但在正式文体中通常用whom, 不可省略;用于指物的关系代词which和that 在非正式文体中也通常省略，但在正式文体中一般不省略。
3. 作定语用whose, 如：(a) He is the man whose car was stolen last week.(b) It was a meeting whose importance I did not realize atthat time.注：“whose +名词中心词”这一结构在定语从句中既能作主语(如上a句)，又能作宾语(如上b句)。
高中英语语法知识总结：定语从句
高中英语语法知识总结：定语从句下面就是小编给大家带来的高中英语语法知识总结：定语从句，希望能帮助到大家!高中英语语法知识总结：定语从句易错点1 关系代词与关系副词的混用1.定语从句相当于一个形容词，起定词作用，修饰名词或代词2.定语从句的引导词的三种功用:( 1)引导定语从句(2)替代先行词(3)在定语从句中充当一定的成分。
3.解题要领:根据定语从句中所缺成分来确定是用关系代词还是关系副词，决不要因先行词是时间名词就用when，是地点名词就用where。
易错点2 关系代词who、whom、whose的误用对于定语从句关系词的考查，首先要确定从句是什么类型的从句，然后再分析关系词在从句中的成分，最后选择正确的词。
要求考生具有一定的句子分析能力，和理解能力。
如果缺少主宾表，要用that或which，缺少状语用关系副词when，where，why，缺少定语用whose。
易错点3 关系代词that和which的误用只用which，不能用that的情况(1) 在介词提前到关系代词之前形成"介词+关系代词"结构来修饰表事物的先行词时，关系代词必须用which.如：☞The house in which we live is very large. 我们住的房子非常大。
这就是老师正在谈及的那本参考书。
注意：如果介词不放在修饰事物的限定性定语从句的句首，which就可换为that，如：☞This is the question which/that we’ve had so much discussion about. =This is the question about which we’ve had so much discussion. 这就是我们已经多次讨论过的问题。
(2) 先行词为"those+表事物的复数名词"时，关系代词通常只用which而不用that。
如：☞Students should keep in mind those regulations which restrict their behavior.学生应牢记那些规范自己的行为准则。
定语从句中关系副词的用法
定语从句中关系副词的用法关系副词，是联系先行词和定语从句的词，属于副词。
定语从句中的关系副词有三个：when, where和why，它们在定语从句中分别作时间、地点和原因状语。
其句法结构如下：1.表时间的名词 + when + 定语从句when指时间，在定语从句中作时间状语。
例句：I still remember the day when I first came to Beijing.I’ll never forget the day when I joined the army.2.表地点的名词 + where + 定语从句where指地点，在定语从句中作地点状语。
例句：The factory where his father works is in the west of the city.This is the house where I lived two years ago.3.表原因的名词reason + why + 定语从句(why只用于reason之后的限制性定语从句中,在定语从句中作原因状语。
)例句：That is the reason why I did the job.(在现代英语中why 可以省略)上句也可以这样表示：That is the reason I did the job.又如：This was the reason (why )we raised the temperature. 关系副词在定语从句中的用法看似简单，以下注意点不可忽视：1）“when”、“where”和“why”的运用取就于表时间的名词、表地点的名词和表原因的名词reason在定语从句中所作的成分，比较下面的几组句子：*I will never forget the day when I first met you on the beach. *I will never forget the days which/that we spent together in Xueyao Middle School.**This is the hospital where my mother works.**This is the hospital which/that we visited the day before yesterday.***The reason why he did not go to school is that he was ill. ***This is the reason which/that he gave his boss in the office .2) “when”、“where”和“why”都可以替换成“介词 + which”，介词的选用取就于先行词和定语从句中的动词。
英语的定语从句总结
英语的定语从句总结英语的定语从句总结所谓定语从句，就是在复合句中起定语作用以修饰主句中的名词或代词的从句。
下面是小编分享给大家的英语的定语从句总结，希望对大家有帮助。
英语的定语从句总结1一、关系代词引导的定语从句1、由who, whom, that，Whose引导的从句这些词代替的先行词是人的名词或代词，who作主语指人，whom作宾语指人，that既可作主语又可作宾语(作宾语可以省略)，可以指人也可以指物。
Whose 用来指人或物，只用作定语。
(1) Is he the man who/that wants to see you? 他是那个想见你的男人吗?(who/that在从句中作主语)(2) He is the man whom/ that I saw yesterday. 他就是我昨天见的那个人。
(whom/that在从句中作宾语)(3) The man whom you spoke to just now is our English teacher 你刚刚说话的那个男人是我们的英语老师(4) he man whose son is a doctor is our professor. 那个儿子是医生的男人是我们的教授。
2、由which, that引导的从句它们所代替的先行词是事物的名词或代词，在从句中可作主语、宾语等，作宾语时可以省略，例如：(1) Prosperity which / that had never been seen before appears in the countryside. 农村出现了前所未有的繁荣。
(which / that在从句中作主语)(2) The package (which / that) you are carrying is about to come unwrapped. 你拿那个包裹快要散开了。
(which / that在从句中作宾语)注意：代表物时多用which，但在下列情况中用that而不用which：a)先行词是anything, everything, nothing , none等不定代词时;b)先行词由every, any, all, some, no, little, few, much等修饰时，这时的that常被省略;c)先行词前有序数词或被形容词最高级修饰时;d)先行词中既有人又有物时;e)整个句中前面已有which，who,that时;f)当先行词为物并作表语时;g)先行词为one时;h)先行词同时又被the only,the very,the same修饰时;二、关系副词引导的定语从句1、when指时间在定语从句中做时间状语也可做连接词用I still remember the day when I first came to the school.2、where指地点在定语从句中做地点状语 Shanghai is the city where I was born.3、why指原因在定语从句中做原因状语，用在reason 后面。
定语从句句知识点总结
定语从句句知识点总结基本结构定语从句由关系代词和关系副词引导，其基本结构如下：关系代词：who, whom, whose, which, that关系副词：when, where, why关系代词的用法1. 关系代词作宾语The man who(m) I met yesterday is a doctor.昨天我遇到的那个人是一名医生。
这里的定语从句“whom I met yesterday”修饰先行词“the man”，在句中作宾语。
2. 关系代词作主语The book that I borrowed from the library is very interesting.我从图书馆借来的那本书很有趣。
定语从句“that I borrowed from the library”修饰先行词“the book”，在句中作主语。
3. 关系代词作表语The reason why he was late is that his car broke down.他迟到的原因是他的车坏了。
定语从句“why he was late”修饰先行词“the reason”，在句中作表语。
4. 关系代词作定语The girl whose mother is a teacher is my best friend.那个母亲是老师的女孩是我最好的朋友。
定语从句“whose mother is a teacher”修饰先行词“the girl”。
关系副词的用法1. 关系副词引导地点状语从句This is the hotel where we stayed last year.这就是我们去年住过的旅馆。
定语从句“where we stayed last year”修饰先行词“the hotel”。
2. 关系副词引导时间状语从句He remembered the day when he first met her.他记得他第一次见到她的那天。
定语从句中的关系副词
定语从句中的关系副词定语从句中的关系副词关系副词，兼有副词与连接词两种作用，在不及物动词的连接中要求用关系副词。
下面是店铺带来的定语从句中的关系副词，希望对你有帮助。
定语从句中的关系副词有三个：when, where和why，它们在定语从句中分别作时间、地点和原因状语。
其句法结构如下：1. when指时间，在定语从句中作时间状语。
例句：I still remember the day when I first came to Beijing.I’ll never forget the day when I joined the army.2. where指地点，在定语从句中作地点状语。
例句：The factory where his father works is in the west of the city.This is the house where I lived two years ago.关系副词“when”、“where”既可引导限制性定语从句，也可引导非限制性定语从句。
例如：I will always remember the day when I first visited the Great Wall.He came to Shanghai in 1980, when he was only 12.I don’t know the exact spot where they will meet.Mr Wang will fly to Beijing, where he will stay for three months.有时关系副词“when”、“where”引导的限制性定语从句和先行词有间隔的现象，是为了平衡句子的语法需要。
Do you remember one afternoon ten years ago when I came to your house and borrowed a diamond necklace?The days are gone forever when the Chinese people used“foreign oil.”.3. why只用于reason之后的限制性定语从句中,在定语从句中作原因状语。
定语从句关系副词讲解
定语从句关系副词讲解定语从句关系副词讲解定语从句，是指一类由关系词引导的从句,因为这类从句的句法功能多是做定语，所以曾被称为定语从句，这类从句除了可以做定语之外，还可以充当状语等其他成分，所以现代语言学多使用“关系从句”这一术语。
在英语中，定语从句主要通过关系代名词法构成。
下面是店铺为大家整理的定语从句关系副词讲解作文，仅供参考，希望能够帮助到大家。
定语从句关系副词讲解：when的用法关系副词when在定语从句中用作状语，表示时间，用以修饰表示时间的先行词；在许多情况下可以理解为“介词+which”的意思(which的意思与先行词所表示的意思等价)，其中的“介词”通常应根据先行词的含与搭配来确定。
如：1988 was the year when he was born. 1988是他的出生年。
句中的when he was born为修饰the year的定语从句，关系副词when在此相当于in which。
表示在某一年，英语习惯上用介词in，如in 1988, in 2008等，所以此处用in which。
I’ll never forget the day when I first met you. 我永远不会忘记第一次见你的那天。
句中的when I first met you为修饰the day的.定语从句，关系副词when在此相当于on which。
表示在某一天，英语习惯上用介词on，如on that day, on Friday等，所以此处用on which。
Don’t forget the time when the wedding will start. 不要忘记婚礼开始的时间。
句中的when the wedding will start为修饰the time的定语从句，关系副词when在此相当于at which。
表示在某一时刻，英语习惯上用介词at，如at that time, at the moment等，所以此处用at which。
定语从句(Ⅱ)——where,when,why,“介词+whichwhom”引导的定语从句
1、关系副词where的用法(1)where的先行词大多是地点名词，在定语从句中作地点状语从句。
This is the school where/in which my father once worked.这是我父亲曾经工作过的学校(2) where的先行词还可以是抽象名词, 如stage,case, situation,position等。
例 They have reached the stage where/at which they will separate 他们已经到了将要分手的地步了。
2、关系副词when的用法(1)when的先行词是时间名词,在定语从句中作时间状语。
例 Do you remember the day when/on which we first met each other ?你还记得我们第一次见面的那一天吗?(2)when的先行词还可以是抽象名词, 如break, interval等。
例There is a long break between the two classes when/at which we can drink some water .在两节课之间有一个长的休息时词,在这期间我们可以喝点水。
3、关系副词why的用法why的先行词是reason,在定语从句中作原因状语。
reason作先行词时,若引导词在从句中作主语或宾语,定语从句要用that或 which引导。
例 I don ' t know the reason why/for which my good friend , jack ,looks unhappy today.我不知道我的好朋友杰克为什么今天看上去不高兴。
(1) The reason why…..是why引导的定语从句,Why在从句中作原因状语,Why可替换成 for which。
(2) The reason that……是that引导的同位语从句,that不作成分,that后面的内容说明 reason的内容。
定语从句中关系副词的用法
定语从句中关系副词的用法关系副词，是联系先行词和定语从句的词，属于副词。
定语从句中的关系副词有三个：when, where和why，它们在定语从句中分别作时间、地点和原因状语。
其句法结构如下：1. 表时间的名词+ when + 定语从句when 指时间，在定语从句中作时间状语。
例句：I still remember the day when I first came to Beijing.I'll never forget the day when I joined the army.2. 表地点的名词+ where + 定语从句where 指地点，在定语从句中作地点状语。
例句：The factory where his father works is in the west of the city.This is the house where I lived two years ago.3. 表原因的名词reason + why +定语从句(why只用于reason之后的限制性定语从句中,在定语从句中作原因状语。
)例句：That is the reason why I did the job.在现代英语中why可以省略)上句也可以这样表示：That is the reason I did the job.又如：This was the reason (why )we raised the temperature. 关系副词在定语从句中的用法看似简单，以下注意点不可忽视：1) when”、“where”和“ why”的运用取就于表时间的名词、表地点的名词和表原因的名词reaso n在定语从句中所作的成分，比较下面的几组句子：*I will never forget the day when I first met you on the beach.*I will never forget the days which/that we spent together in Xueyao Middle School.**This is the hospital where my mother works.**This is the hospital which/that we visited the day before yesterday.***The reason why he did not go to school is that he was ill.***This is the reason which/that he gave his boss in the office .2) “when”、“where”和“why”都可以替换成“介词+ which”，介词的选用取就于先行词和定语从句中的动词。
定语从句名词性从句强调
定语从句名词性从句强调定语从句所谓从句，就是一个主谓结构相当于整个句子(这样的句子叫复合句)的一个成分，因此，从句不能单独使用。
在复合句中修饰名词或代词、作定语的句子叫定语从句。
定语从句是中国人学英语的难点之一。
其实定语从句很有规律，总结如下:在关系代词中that既可指人又可指物、既可作主语又可作宾语，因此，除了在非限定性定语从句中，用that一般不会出问题。
关系副词的用法比较单一，它们从句中只起状语的作用，表示时间的就用when，表示地点的就用where，而why只修饰一个词，即reason。
定语从句所修饰的词叫“先行词”，因为它总是处在定语从句的前头，比定语从句先行一步。
引导定语从句的词叫关系词，包括关系代词和关系副词。
关系代词：who，which，that作从句的主语whom，which，that作从句的宾语(可省略)whose从句中作定语以下情况只能用that，不能用which:i. 先行词为不定代词all, little, none，any，every，no，much, anything, nothingii. 先行词有最高级和序数词修饰时(包括: the only, the very, the same, the last, the next等)iii. 先行词既有人又有物的时候以下情况只能用which，不能用that;①引导非限制性定语从句(包括代表整个主句的意思时)②介词+关系代词的结构中关系副词：when指时间，在定语从句中作时间状语where指地点，在定语从句中作地点状语why指原因，在定语从句中作原因状语，只修饰reason。
如果用定语从句把两个句子合二为一:首先找出两个句子当中相同的部分，定语从句修饰的就是这一部分。
要把其中一个句子变成定语从句，就要把这句中相同的那个部分用一个关系词来代替;代替时，先看被代替的部分是指人还是指物、再看它作什么句成分。
指人并作主语的，就用who。
定语从句的相关知识点归纳
定语从句的相关知识点归纳定语从句的相关知识点归纳在现实学习生活中，说到知识点，大家是不是都习惯性的重视？知识点是传递信息的基本单位，知识点对提高学习导航具有重要的作用。
掌握知识点有助于大家更好的学习。
以下是店铺收集整理的定语从句的相关知识点归纳，希望能够帮助到大家。
定语从句的相关知识点归纳1.定语从句：定语从句是由关系代词或关系副词引导的从句，其作用是作定语修饰主句的某个名词性成分，相当于形容词，所以又称为形容词性从句，一般紧跟在它所修饰的先行词后面。
2.关系词：引导定语从句的关联词称为关系词，关系词有关系代词和关系副词。
关系代词有that, which, who, whom, whose, as等，绝对没有WHAT；关系副词有where, when, why等。
关系词常有3个作用：①连接作用，引导定语从句。
②代替主句中的先行词，甚至可能是主句中的一部分或者整个主句。
③在定语从句中充当一句子成分。
注：关系代词有主语、宾语之分。
一般whom作为宾语。
3.定语：定语用来限定、修饰名词或代词的，是对名词或代词起修饰、限定作用的词、短语（动词不定式短语、动名词短语和分词短语）或句子，汉语中常用‘……的’表示。
主要由形容词担任，此外，名词，代词，数词，分词，副词，不定式以及介词短语也可以来担任，也可以由一个句子来担任。
单词作定语时通常放在它所修饰的词之前，作前置定语。
短语和从句作定语时则放在所修饰的词之后，作后置定语。
4、先行词：被定语从句修饰的名词、代词称为先行词。
关系代词引导的定语从句举例关系代词所代替的先行词是人或物的名词或代词，并在从句中充当主语、宾语、定语等成分。
关系代词在定语从句中作主语时，从句谓语动词的人称和数要和先行词保持一致。
1、who, whom, that这些词代替的先行词是人的名词或代词，who做主语指人，whom作宾语指人，that既可作主语又可作宾语（作宾语可以省略），可以指人也可以指物。
定语从句中关系副词的用法
定语从句中关系副词的用法关系副词，顾名思义，是联系先行词和定语从句的词，属于副词。
定语从句中的关系副词有三个：when, where和why，它们在定语从句中分别作时间、地点和原因状语。
其句法结构如下：表时间的名词+ when + 定语从句when指时间，在定语从句中作时间状语。
例句：I still remember the day when I first came to Beijing.I’ll never forget the day when I joined t he army.表地点的名词+ where + 定语从句where指地点，在定语从句中作地点状语。
例句：The factory where his father works is in the west of the city.This is the house where I lived two years ago.表原因的名词reason + why + 定语从句(why只用于reason之后的限制性定语从句中,在定语从句中作原因状语。
)例句：That is the reason why I did the job.(在现代英语中why可以省略)上句也可以这样表示：That is the reason I did the job.又如：This was the reason (why )we raised the temperature.关系副词在定语从句中的用法看似简单，以下注意点不可忽视：1）“when”、“where”和“why”的运用取就于表时间的名词、表地点的名词和表原因的名词reason在定语从句中所作的成分，比较下面的几组句子：*I will never forget the day when I first met you on the seashore.*I will never forget the days which/that we spent together in Xueyao Middle School.**This is the hospital where my mother works.**This is the hospital which/that we visited the day before yesterday.***The reason why he did not go to school is that he was ill.***This is the reason which/that he gave his boss in the office .2) “when”、“where”和“why”都可以替换成“介词+ which”，介词的选用取就于先行词和定语从句中的动词。
定语从句关系词的用法
定语从句关系词的用法定语从句关系词怎么用？下面是店铺为大家收集整理的定语从句关系词的用法相关内容，欢迎阅读。
一、关系代词引导的定语从句1、that 指人或物在从句中作主语，宾语或表语which 指物在从句中作主语，宾语或表语（作宾语时可以省略）who 指人在从句中作主语，宾语或表语whom 指人在从句中作宾语whose 指人或物在从句中作定语as 指人或物在从句中作主语，宾语或表语but 指人或物在从句中作主语，宾语或表语注意：指物时，whose+名词=the+名词+of which或of which+the+名词2、as 的用法（1）常用于下列结构：such…as; so…as;the same…as; as…as注意：the same…as 表示同一类，不同一个the same…that 表示同一个（2）as与which的区别a、位置不同as可放在主句后，主句前或主句中间；which只能放在主句后。
b、as起连接作用，表达说话人的观点、看法，并指出主句内容的根据或出处，意为“正如，正像”。
Which相当于并列句，可以用and this来代替，意为“这一点，这件事’”。
注意：as常用于下列结构：as we know/ as is known to all, as we all can see, as has been said before/above,as might be excepted, as is often the case, 一般不能用which 代替as。
c、在从句中作主语时，which既可作系动词be的主语也可作实义动词的主语，而as只可作系动词be的主语。
3、but用作关系代词，相当于who/that…not例：In China there is no one but knows Lei Feng.二、只用that不用which的情况1、.先行词为all , much, everything, nothing , something ,anything, nothing, none, the one等不定代词时2、先行词被only, any, few, little, no , all, just , very ,right等修饰时.3、当先行词是最高级或被形容词最高级修饰时。
英语句子定语从句的用法
英语句子定语从句的用法导语：定语从句的用法是什么?以下是为大家的文章，欢送阅读!希望对大家有所帮助!1、一共有9个：who, whom , whose, that, which,when,where, why, as与名词从句相比：定从不能由what和how引导;which的含义改变;定从内部的介词可以放引导词前。
2、引导词的功能有哪些?(1)引导定语从句(2)代替先行词在定语从句中充当一个成分。
(先行词在从句中不再出现)1、首先，要能判断出该从句是什么从句：(1)放句首没有用逗号分开的，一般是主语从句，也有可能是状语从句，但从句完毕后假设有表达时态变化的动词，那么一定是主语从句。
(2)放及物动词后，假设及物动词不是被动语态，后面一定是宾语从句;假设该及物动词是被动语态，后面一般是主语从句(It+ is + adj/n./done+that/whether/when…)或状语从句。
(3)放be动词后，后面一定是表语从句，但“It is/was + 从句(被强调成分) + that”是强调句(强调句中“非谓语”)。
(4)放名词后，一般是定语从句，但假设该名词有“内涵/内容”(fact/truth/news/information/ problem/suggestion)，那么很可能是同位语从句。
(5)用逗号分开的从句，一般是状语从句或 as/which引导的定语从句，也要注意用放在句中用逗号分开的“插入语”(however, for example,believe it or not等)。
2、其次，判断出是定语从句后可以用“三个优先”法做题：(1)优先选择含whose的选项，能与空格后的名词构成“某人的某物”搭配，一般就是答案;(2)优先选择含介词的选项，然后看该介词与从句中的谓语是否能构成符合逻辑的搭配;(3)用逗号分开的定从，优先考虑as和which,假设该空能翻译为“一件事”而从句意思是通顺的，那么放句首就用as,句末用which(假设该空能翻译为“如同”“像…一样”那么应用as)3、再次,做定语从句题可以用“三问法”来检测是否出错：(1)先行词本身是否为特殊的词?way+ in which/that/省略指物的不定代词：anything, one, some,many, a lot, all, both, that等 + that指人的不定代词或数词：one, those, anyone, two等 + who 既有人又有物： + that“抽象的地点”condition, situation,case, point + where “抽象的时间”one’s stay/visit + when在特定语境中可以作“地点/位置”理解的词：trousers/ sleeves + where(2)先行词前面有无特殊的词?有不定代词修饰：all/every/little/much+ …+ that有最高级/序数词修饰：the best/second … + that有just the/ the very/ the only/ the last等修饰：+ that 有who/which疑问词：+ that(防止重复)有the same/ such/ as修饰：一般+ as(注意：①第一个as是否为一个以as结尾的搭配，如regard…as;②区分such…as(定从)与such …that“如此…以至于”)(3)先行词在定语从句中充当什么成分?注意：从句中spend后的“时间”，以及visit后的“地点”，不是状语，而是宾语，应该用不定代词4、只能用that引导定语从句有哪些情况?先行词前为all, everything, nothing,something, anything, little, much等不定代词时;先行词前有：all, every, no, some, any,little, much, few等不定代词修饰时;先行词被序数词修饰时;先行词被形容词最高级修饰时;先行词前only, just, very, last有等修饰时;先行词是表示人和物混杂的两个名词时;主句是以who, which,开头的疑问句或先行词是疑问代词时;在修饰时间、地点等先行词时，只有用that代替when, where等引导词;【例】I'll never forget the Sunday (that) you first arrived.Do you know anywhere (that) I can get a drink ?先行词为reason, way (意为“方法”)时，常用that 代替why,which, in which，也可省略。
why引导的定语从句例句
why引导的定语从句例句why引导的定语从句例句定语从句除可用关系代词引导外，还可用关系副词when, where 与why来引导，它们的区别是：when用于指时间，where用于指地点，why用于指原因。
下面是店铺整理的why引导的定语从句例句，欢迎大家阅读参考，希望帮助到大家。
why引导的定语从句例句1关系副词why引导限定性定语从句修饰先行词reason，在定语从句中充当原因状语。
例如：I don’t know the reason why he came so late. 我不知道他来得那么晚的原因。
// That is the reason why I don’t want to go. 那就是我不想去的理由。
// He didn’t tell me the reason why he was so upset.他没有告诉我他为什么那样心烦意乱。
1.在reason作先行词的定语从句中，若从句表原因，一般用why 引导定语从句，why可以用for which替换。
why还可省去。
why=for which(for在这里是表原因的)The reason why (for which) he has resigned is poor health.(他辞职的理由是健康状况不佳。
)reason是名词在句子中充当先行词，而why后所接的定语从句是用来修饰reason的。
原因是他的健康情况不是很好，什么原因那?奥，，原来是他辞职的原因。
(这句话中他辞职来修饰原因)2.当reason作主语带有定语从句修饰时，其后的表语从句通常用that不用because。
The reason why(符合第一条) he didn't come in time was that he didn't feel well.他没有来的原因是因为他不舒服。
就是说后面跟的是一句句子要+thatwhy为引导词，reason为先行词这个知识点是在强调，当主语有定语从句时，表语从句(就是be 动词后边的那个句子)为了避免重复就不用because引导，而用that 这边如果大家做选择，请记住选that 不是because3.当reason用作定语从句的宾语时，引导词用that/which,而且that/which可省去。
reason的用法小结
《小词小结》之《reason的用法小结》首先强调一下，reason后why引导的不是同位语从句，而是定语从句。
1 reason + clause1) reason+定语从句a. 关系副词充当定语从句的原因状语，可以用why或that 或省略。
The reason I called was to ask about the plans for Saturday. - LongmanThe reason why（或者that）he doesn’t come is that he is ill. ——《英汉大词典》The reason that [why] he died was lack of medical care. ——《用法词典》That’s one of the reasons he always gets on my nerves. ——《用法词典》备注：关系副词可以用for which代替。
The first question is whether the reason for which Googleconsidered entering the wholesale broadband market in the first place still holds.b. 关系代词充当定语从句的主语或宾语，可以用that或which，与一般的定语从句用法相同。
What is the reason that he gave for this?What was the reason which led the slaves to leave the estates in British Guiana?2) reason+同位语从句，用that引导。
We decided against installing new heating apparatus, for the reason that it would be too costly.——《用法词典》She didn’t answer for the simple reason that she couldn’t think of anything to say. - Longman2 reason + for/of/to（小品词）His reason for going back to school is to learn new things. - People give many different reasons for wanting to change jobs. – LongmanThey must have had a good reason to do it. – LongmanThe reasons of the German defeat were many and complex. ——《用法词典》What was the reason for（或者of）him being late? ——《英汉大词典》备注：reason作“理由，原因”讲时，通常作可数名词，其前常与for 搭配；作“充足理由”讲时，为不可数名词，后面多跟不定式。
定语从句中关系副词的用法
定语从句中关系副词的用法关系副词,顾名思义,是接洽先行词和定语从句的词,属于副词.定语从句中的关系副词有三个：when, where和why,它们在定语从句平分离作时光.地点和原因状语.其句法构造如下：表时光的名词+ when + 定语从句time,day,hour,yearwhen指时光,在定语从句中作时光状语.例句：I still remember the day when I first came to B eijing.I’ll never forget the day when I joined the army.表地点的名词+ where + 定语从句place,room,housewhere指地点,在定语从句中作地点状语.例句：The factory where his father works is in the wes t of the city.This is the house where I lived two years ag o.表原因的名词reason + why + 定语从句(why只用于reason之后的限制性定语从句中,在定语从句中作原因状语.)例句：That is the reason why I did the job.(在现代英语中why可以省略) 上句也可以如许暗示：That is the reason I did the job.又如：This was the reason (why )we raised the temperature. 关系副词在定语从句中的用法看似简略,以下留意点不成疏忽：1）当先行词是时光,地点,原因时,其实不是必定对应应用when,where,whyThe factory ________ I visited is not far from here.诀窍：1.先找定语从句：____I visited,2.假设可填入which,which I visited,which指代factory3.看定语从句是否完全;I visited the factory.很完全,which准确,或thatThe factory ________ I work is not far from here.1. ___I work2. which I work,,,,which指代factory3.看定语从句是否完全I work the factory.I work in the factory,可见缺乏in4.是以应当是in which I work=where I work*I will never forget the day when I first met y ou on the seashore.*I will never forget the days which/that we spent together in Xueyao Middle School.**This is the hospital where my mother works.**This is the hospital which/that we visited the day before yesterday.***The reason why he did not go to school is th at he was ill.***This is the reason which/that he gave his boss in the office .2) “when”.“where”和“why”都可以调换成“介词+ which”,介词的选用取就于先行词和定语从句中的动词.例如：Do you still remember the day on which we first met in Nantong?(on which=when)This is the room in which we lived last year.(in which=where)This is the park _________you took photos last Sunday. That was the reason________he was late for school.Do you know the reason for which he refused to go to Mary’s birthday party. (for which=why)The house which he lives in needs repairing.The house in which he lives needs repairing.The house where he lives needs repairing．The day when Mandela helped him was the happiest day for Jim?The day on which Mandela helped him was the happiest day for Jim有时定语从句中介词短语和动词有意义慎密的润饰关系,尤其在非限制性定语从句中,常应用“介词+ which”构造,而不应用关系副词.例如：My mother works in a factory, in front of which there is a small river.At night the soldiers got to a small hill, at t he foot of which stood a farmhouse.3）以下名词之后也通经常应用where/in which引诱的定语从句：situation(形势), case（情形,病例,案例）, position （地位,地步）.occasion（场合）等等.This is the point where I don't agree.They are in such a situation where everything is out of order.The police are looking into the case where two VIPs were killed.They were some occasions where we have to tell some white lies.4) “that”可活用为关系副词,相当于“when, where.why”和“介词+ which”构造,尤其在“the time when”等构造中的“when”常被“that”代替,并且“that”往往省略.I may leave here any time I want to.During the time I was there I visited him twic e.This is my second time I have come to your co untry.5) “which”有时可用作关系形容词,这是“which”在非限制性定语从句中的特别应用,如：The doctor advised him to give up smoking, which advice he did not follow.。
reason 定语从句的三种接法
reason 定语从句的三种接法Reason 定语从句的三种接法是指在英语中使用reason 对系动词或形容词进行修饰时，它所引导的定语从句有三种接法。
作为定语从句，reason 可以指代事物的原因或理由，也可以指代人的思想和愿望，并以此来引导定语从句，使得句子更加具体、准确。
首先，reason 接that 引导的定语从句。
在定语从句中，reason 常常指代某一事物的原因，这种情况下，它通常跟that 引导的定语从句搭配使用，而且that 不可省略。
比如：The reason that he failed the exam is that he didn't study hard.（他考试失败的原因是他没有认真学习。
）在此句中，reason 所引导的定语从句即为he failed the exam 的原因，故要用that 引导。
同样，它也可以指代某一事物的目的，而这种情况下，也需要用that 引导的定语从句。
比如：He came here for the reason that he wanted to find a job.（他来这里的目的是他想找份工作。
）其次，reason 接which 引导的定语从句。
which 引导的定语从句比 that 引导的定语从句更加灵活，它可以指代前文提到的事物，也可以指代前文没有提到的事物。
比如：I moved to this city for the reason which Ihaven't told you.（我搬到这座城市的原因我没有告诉你。
）此句中，reason 所引导的定语从句是指代前文没有提到的原因，所以采用which 引导。
第三，reason 接不定式短语作定语。
不定式短语作定语时，要将it 放在句首，然后加上for 引导，最后接上不定式短语作定语。
比如：It is for the reason to take care of his mother that he chose not to go abroad.（他选择不出国，是为了照顾他母亲。
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reason在定语从句中的用法
例句1：The reason why he could not go there was that his grades were too low.
The reason why...is that... 这是特定句型, why引导定语从句,is后的用词为that,一般不用because.又如：
例句2:The reason why she did it is that she wouldn’t let her parents feel disappointed.她做那件事是因为她不想让父母失望。
该句中的why引导一个定语从句，而that引导表语从句。
(1) 句中that引导的表语从句说明主语reason的具体内容
注意以下两种结构：
①The reason is / was that …当主语是reason / cause时，一般不能用
because或why引导表语从句，以免造成语意重复。
The reason why/for which(也可以省去) he was late was that he got up late.
他迟到的原因是他起床晚了。
②当主语是This / That时，可以由because / why引导表语从句。
He got up late. That was why he was late for class.
He was late for class. That was because He got up late.
(2)why在句中是关系副词，引导定语从句，修饰先行词reason，同时它在定语从句中作状语，此时why = for which，但要注意：关系词在定语从句中做主语或宾语时，要用关系代词that或which。
The reason why/for which(也可以省去) he was late was that he got up late.
他迟到的原因是他起床晚了。
The reason that/which/(也可以省去) he gave you was reasonable.
他给你的理由是合理的。
【练习】
-- I drove to Zhuhai for the air show last week.
-- Is that ____ you had a few days off?
A. why
B. when
C. what
D. where
变式①Is this the reason ____ at the meeting for his carelessness in his work?
A. he explained
B. what he explained
C. how he explained
D. why he explained
变式②The reason ____he failed to pass the exam was ____ he never studied hard.
A. why what
B. because that
C. why that
D. why because
变式③Is this the reason _____ he was punished? Which of the following is wrong?
A. why
B. for which
C. 不填
D. that。