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定语从句是一种英语语法结构，用于修饰名词或代词，说明其性质或特征。
以下是定语从句的主要用法：
1. 引导词：定语从句由引导词引导，常用的引导词有that、which、who、whose、whom、where、why等。
2. 关系词：关系词在定语从句中作为替代词，代表被修饰的名词或代词。
关系词分为关系代词和关系副词。
关系代词有who、whom、whose、that、which等，关系副词有where、why、how等。
3. 限定性定语从句和非限定性定语从句：限定性定语从句对所修饰的名词或代词进行限定，使句子意思更加明确。
而非限定性定语从句则是对所修饰的名词或代词作进一步的描述或解释，通常用逗号与主句隔开。
4. 介词+关系代词：在定语从句中，介词+关系代词的结构常常引导定语从句。
常用的介词有in、on、by、to等。
5. 省略引导词：在口语和书面语中，有时可以省略引导词。
但在正式文体中，通常需要保留引导词。
总的来说，定语从句是英语语法中的一个重要组成部分，它可以增强句子的表达效果和准确性。
在使用定语从句时，需要注意语法规则和表达习惯，以确保句子通顺、流畅。
英语中的定语从句用法定语从句是英语中非常重要的一种句子结构，它能够为主句提供更多的信息，使句子更加丰富和准确。
在学习和运用定语从句时，我们需要掌握一些基本的用法和注意事项。
一、定语从句的引导词定语从句通常由关系代词或关系副词引导。
关系代词包括that, which, who, whom, whose等，而关系副词则包括where, when, why等。
在选择引导词时，我们需要根据引导词在定语从句中的作用来决定。
1. 当引导词在定语从句中作主语时，我们可以使用关系代词who, which或that。
例如：The girl who is standing over there is my sister.（那个站在那边的女孩是我妹妹。
）2. 当引导词在定语从句中作宾语时，我们可以使用关系代词whom, which或that。
例如：I have a friend whom I can always rely on.（我有一个朋友，我总是可以依靠他。
）3. 当引导词在定语从句中作介词的宾语时，我们可以使用关系代词whom, which或关系副词where, when等。
例如：This is the hotel where we stayed last summer.（这是我们去年夏天住过的酒店。
）二、定语从句的位置定语从句可以出现在主句的前面或后面，具体位置取决于定语从句的内容和语境。
当定语从句的内容对于理解主句非常重要时，我们通常将其放在主句的后面。
例如：I bought a book that was recommended by my teacher.（我买了一本被我的老师推荐的书。
）另外，当定语从句的内容对于理解主句并不是非常重要时，我们通常将其放在主句的前面，并用逗号与主句隔开。
例如：The weather being fine, we decided to go for a picnic.（天气很好，我们决定去野餐。
定语从句的用法一、定语从句1、定义定语从句（Attributive Clause）是一个附加于名词或代词之上的句子，它用来形容前面的名词或代词。
它的作用是限定或说明某个名词或代词所指的人或事物，是一种非常重要的句子结构。
2、关系词在定语从句中，关系词（Relative Pronoun）的作用是连接主句和定语从句，并将定语从句中的成分与主句中的某个成分联系起来。
一般而言，我们常用关系代词who, whom, whose, which和that来引出定语从句。
关系代词who 指人whom 指人whose 指人或物which 指物that 指人、物或事3、定语从句的构成（1）定语从句通常由关系代词在定语从句中引出关系，并在从句中担任某一成份的角色；（2）定语从句的谓语动词也可由一些连接词（link verb）连接，如be, feel, look, seem, smell, taste, remain，常用于定语从句中；（3）定语从句中如果省略结构，就不能用who/whom来引导定语从句；（4）定语从句中由关系副词引导而不是关系代词。
4、定语从句的用法（1）定语从句可以用来限定、修饰某个名词或代词，例如：The movie《Titanic》, which was released in1997, is still popular today.（《泰坦尼克号》，1997年上映，至今仍颇受欢迎。
）（2）定语从句可以用来替代某个句子中的某个成分，如：My sister, who lives in Beijing, is a doctor.（我在北京居住的姐姐是一位医生。
）（3）定语从句可以用来表示地点，例如：She lives in a small village where there are few people.（她住在一个人很少的小村庄里。
）（4）定语从句可以用来表示时间，例如：He was born in 1992 when the economy began to boom.（他出生在1992年，那时经济开始繁荣。
定语从句的用法定语从句是英语中一种非常常见的从句结构，用于修饰名词或代词，从而进一步说明或限制其含义。
定语从句在句子中起到提供额外信息的作用，使得句子更加清晰明了。
本文将介绍定语从句的用法，并提供一些例子来帮助理解。
一、定语从句的引导词定语从句的引导词包括关系代词和关系副词。
其中，关系代词包括that, who, whom, whose, which，关系副词包括when, where, why。
1. 关系代词：- that：用于指人和物，常用于限定性定语从句中；- who：用于指人，常用于非限定性定语从句中；- whom：用于指人，在口语中较少使用，常用于非限定性定语从句中；- whose：用于指人和物，表示所属关系；- which：用于指物，常用于限定性定语从句中。
2. 关系副词：- when：用于指时间；- where：用于指地点；- why：用于指原因。
二、限定性定语从句限定性定语从句用来对先行词进行具体限制和说明，如果去掉这个从句，句子的意思就不完整或不清楚。
定语从句与先行词之间可以使用关系代词或关系副词来引导。
下面是一些限定性定语从句的例子：1. 关系代词引导的限定性定语从句：- I have a friend who can speak multiple languages.（我有一个会说多种语言的朋友。
）- The book that I borrowed from the library is really interesting.（我从图书馆借来的那本书真的很有趣。
）2. 关系副词引导的限定性定语从句：- The day when I graduated from college was unforgettable.（我大学毕业的那一天是难以忘怀的。
）- She showed me the exact spot where the accident happened.（她给我指出了事故发生的确切地点。
定语从句用法定语从句是英语中常用的修饰句子成分的一种从句。
它通过引导词来连接主句和从句，一般用来修饰名词或代词，起到进一步说明、限定或描述的作用。
定语从句在英语中非常常见，并且灵活运用它可以提高语言表达的准确性和流畅性。
本文将介绍定语从句的基本用法以及注意事项，并通过例句加以说明。
一、定语从句的基本结构定语从句的基本结构是：关系代词/关系副词 + 句子。
关系代词有who, whom, whose, which, that等；关系副词有where, when, why等。
关系代词在定语从句中充当主语、宾语或所有格，关系副词在定语从句中充当地点状语、时间状语或原因状语。
例句1：I have a friend who teaches English in a university.例句2：The book that you lent me is very interesting.例句3：This is the reason why he failed the exam.二、定语从句的引导词选择1. 关系代词的选择（1）指人：who, whom, whose, that（2）指物：which, that（3）指人或物：who, whom, whose, which, that2. 关系副词的选择（1）地点：where（2）时间：when（3）原因：why三、定语从句的位置定语从句通常紧跟被修饰的名词或代词，但也可以放在其他位置，以使句子更连贯流畅。
例句4：The boy who is wearing a red shirt is my brother.例句5：The movie, which was directed by Steven Spielberg, won several awards.四、定语从句的省略1. 关系代词的省略当关系代词在定语从句中作宾语且在从句中不作成分时，可以省略。
例句6：Is there anyone (that/who) wants to join the party?2. be动词的省略当主句和从句中有相同的be动词时，从句中的be动词可以省略。
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)。
定语从句的用法与例子定语从句是英语中一种描述性的从句，用来修饰名词或代词。
它可以提供额外的信息，进一步解释主句中的名词或代词。
以下是一些定语从句的用法和例子：1. 用关系代词引导定语从句：- The book that is on the table belongs to John.（那本在桌子上的书属于约翰。
）- The girl who won the prize is my sister.（赢得奖项的那个女孩是我妹妹。
）- This is the house which was built last year.（这是去年建造的房子。
）2. 用关系副词引导定语从句：- This is the place where we met.（这是我们相遇的地方。
）- Can you show me the reason why you are late?（你能告诉我你迟到的原因吗？）- Do you know the time when the meeting starts?（你知道会议开始的时间吗？）3. 将介词+关系代词或副词连用引导定语从句：- The woman with whom I had lunch is my boss.（和我一起吃午饭的那个女人是我的老板。
）- The city in which he was born is famous for its architecture.（他出生的那座城市以其建筑闻名。
）需要注意的是，定语从句通常用来限定或补充前面提到的名词或代词，从而使句子更加具体和清晰。
定语从句可以出现在主从复合句中，提供更多的信息，并且可以通过关系代词和关系副词来引导。
希望以上信息对您有所帮助！。
定语从句的语法结构与引导词定语从句是英语中常见的一个语法结构，用来修饰名词或代词，进一步说明其特征和性质。
它在句子中起到修饰作用，为读者提供更多的信息。
在定语从句中，引导词的选择非常重要，不同的引导词会对句子的意思产生不同的影响。
本文将探讨定语从句的语法结构和不同引导词的用法。
一、定语从句的基本结构与用法定语从句通常由关系词引导，关系词可以引导主语、宾语或定语从句。
常见的关系代词包括that, which, who, whom, whose等，关系副词有where, when, why等。
定语从句的基本结构为：关系词 + 主语 + 谓语 + 宾语。
例如：1. I bought a book that is very interesting.（我买了一本很有意思的书。
）2. The girl who is wearing a red dress is my sister.（穿红裙子的女孩是我妹妹。
）二、指人的关系代词和关系副词的用法1. who: 指代主语，用于修饰人。
例如：The boy who is sitting over there is my friend.（那个坐在那边的男孩是我的朋友。
）2. whom: 指代宾语，用于修饰人。
例如：The woman whom he met yesterday is a famous actress.（他昨天见到的那个女人是一位著名的演员。
）3. whose: 用于修饰人或物，表示所属关系。
例如：The man whose car was stolen is very upset.（那个车被偷的人非常难过。
）4. where: 用于修饰地点。
例如：This is the school where I study.（这是我学习的学校。
）5. when: 用于修饰时间。
例如：That was the day when we met for the first time.（那是我们第一次见面的日子。
定语从句的用法定语从句的用法定语从句是语法里重要的一个环节，以下是店铺分享的定语从句的用法，一起来参考吧！一、定语从句的用法1. that的用法that是所有关系代词中最常用的，它既可指人也可指物，既可用作主语也可用作宾语。
如：This is the photo (that) I took.这就是我拍的照片。
引导定语从句的关系代词that在此指事，且在定语从句中用作宾语，故可以省略。
They live in a house that was built 200 years ago.他们住在一座两百年前盖的房子里。
引导定语从句的关系代词that在此指物，且在定语从句中用作主语，故不可以省略。
The man that I saw told me to come here.我见到的人让我到这里来。
引导定语从句的关系代词that在此指人，且在定语从句中用作宾语，故可以省略。
2. who / whom的用法关系代词who和whom均只能指人，不能指物；从理论上说，who是主格，在定语从句中用作主语；whom是宾格，在定语从句中用作宾语。
但在实际运用中，除非是直接用作介词后作宾语，否则凡是用宾格whom的地方。
如I met someone who said he knew you.我碰到一个人，他说认识你。
引导定语从句的关系代词who在此指人，且在定语从句中用作主语，故不可以省略。
She is the girl (who, whom) you saw in school.她就是你在学校见到的那个女孩。
关系代词在定语从句中用作宾语，从理论上说应用whom，但也可以用who；由于是用作主语，所以它们也可以省略。
注意，如果关系代词是直接用作介词后作宾语，不可以用who来代替whom。
如：The girl to whom I spoke is my cousin.我和她谈话的那个姑娘是我表妹。
句中的whom直接用在介词to的后面作宾语，故不可省略。
定语从句的基本用法先请认真阅读下列各句，下列各句中的黑体部分均为该句所包含的定语从句：1.This is the teacher who played basketball with us yesterday.2.Tom is the boy whom they are looking for.3.The house , which they built last year looks very new.4.Physics is the most interesting subject that we learnt in the middle school.从以上各句中我们可以看出定语从句是用来修饰它前面的名词或代词的，它起着修饰或限定作用。
当然定语从句也可以用来修饰一个句子，在此我们不作讨论。
定语从句分为限制性定语从句和非限制性定语从句。
限制性定语从句所修饰的词是一个、一些或一类特定的人或事物，一般不能省略，拿掉后剩下的部分则没有意义，或者表述不清。
非限制性定语从句则不然，它只对所修饰的词作进一步的说明，拿掉以后剩下的部分仍然可以成立，常常用逗号将其隔开。
例如：This is the place where the Chinese Communist Party was founded. 此句中的定语从句是限制性定语从句。
如果拿掉则This is the place.一句没有意义。
This message was left by Xiao Wang, who telephoned you just now. 此句中的定语从句是非限制性定语从句。
如果拿掉则This message was left by Xiao Wang,一句仍有意义。
被定语从句修饰的词叫做先行词，引导定语从句的词称为关系代词或关系副词。
常见的关系代词和关系副词有who, whom,that,whose,which,where,when,why等。
现在我们侧重讨论如何使用这些关系代词和关系副词。
如果关系代词在从句中作主语时一般不能省略，而作宾语时一般可以省略。
一，关系代词who, whom的用法。
1.who可以代替人（即它的先行词必须表示人），在从句中可以担任主语。
也可以在从句中担任宾语，但是它的前面不能带介词，如果带介词则必须使用宾格whom。
whom在从句中只能担任宾语。
例如：a)This is the teacher who often tells us interesting stories in class.b)Mary is the girl who/whom Tom wants to marry.c)Mrs White is a teacher whom every student likes.d)She is the girl with whom I will go to Shanghai tomorrow.2.在定语从句中当先行词表示人时who和that是通用的。
例如：a)Miss Green is the new teacher who/that teaches us spoken English.b)John’s father is an engineer who/that came to see him last Wednesday.但在下列情况下则宜用who 而不用that。
1)先行词是one, ones, anyone时。
如：One who doesn’t study hard in his school time cann’t find a good job in the future. Ones who bought big and nice flat must have a lot of money.Anyone who fails in this test will not be allowed to join in the national test.2) 先行词是those时。
如：Those who want to go to the Great Wall should write the names here.Those who were not fit their work could not see the beautiful clothes made of the magic cloth.3) 先行词是有较长的后置定语修饰时。
如：Yesterday I met a foreigner in a blue shirt who could speak very good Chinese.4)当一个句子中带有两个定语从句时，其中一个定语从句的关系代词用that，而另一个则用who，如：The boy that I met last night is the head of the computer group who studies very hard.5)在there be开头的句子中宜用who。
如：There is an old man who wants to see you.There were two girls who came to school after7:45.二，关系代词whose的用法。
whose是代词的所有格，它既可以代人也可以代物，相当与of whom, of which。
如：Einstein is the world famous scientist whose invention won the Nobel Prize in 1921.= Einstein is the world famous scientist ,the invention of whom won the Nobel Prize in 1921.China is an Asian country whose population is about 1.3 billion.=China is an Asian country, the population of which is about 1.3 billion.三，关系代词that的用法。
首先，要特别注意的是，通常情况下，that只能用于限制性定语从句中，在非限制性定语从句不用that。
另外，介词后面不用that，而用which。
例如：The radio, which（此处不用that，因为它是非限制性定语从句）I bought last week doesn’t work .I gave him a ticket for which(介词后不用that而用which) I paid 15 dollars.在限制性定语从句中that和which在指代物时，一般可以通用，如：The plane that/which has just taken off is half an hour late.在下列情况下，只用that而不用which。
a)当先行词是形容词的最高级，或被形容词的最高级修饰时。
如：This word is the best that is used to answer the question.English is the most useful subject that we learned in the middle school.b)当先行词是序数词，或被序数词修饰时。
如：The USA is the first that sent men to the space.That is the second American film that I have ever seen since I came to this country.c)当主语已有疑问词who或which时。
如：Which is the bike that you lost?Who is the woman that spoke at yesterday’s meeting?d)当先行词既有人又有物时。
如：I don’t know the persons and the things that they are talking about in the hall.e)当先行词是all, much, little, something, everything, anything, nothing, none, theone等词时。
如：You should hand in all that you have.I mean the one that you talked about just now.f)当先行词前面有only, any, few, little, no, all, one of, the same, the very等词修饰时。
如：The only thing that we can do is to give you some money.Li Ming is one of the students that want to be teachers in the future in our class.四，关系副词where, when, why的用法。
a)当先行词表示地点时用where。
可省略。
如：This is the house where Lu Xun was born.=This is the house in which Lu Xun was born.= This is the house that Lu Xun was born..=This is the house Lu Xun was born..b)当先行词表示时间时用when。
可省略。
如：October 1st,1949 was the day when the PRC was founded.= October 1st,1949 was the day on which the PRC was founded.= October 1st,1949 was the day the PRC was founded.= October 1st,1949 was the day that the PRC was founded.c)当先行词表示原因时用why。
可省略。
如：The reason why I’m calling you is to invite you to have dinner with me.= The reason that I’m calling you is to invite you to have dinner with me.= The reason for which I’m calling you is to invite you to have dinner with me.= The reason I’m calling you is to invite you to have dinner with me.专项练习单项选择1．I shall never forget the years ________I lived in the country with the farmers.A. whenB. during thoseC. whichD. where2.Can you tell me the name of the factory _______you visited last week?A. whatB. whereC. whichD. to which3.I don’t know _________ you tell her.A. the wayB. the way in thatC. the way whichD. the way of which4.She heard a terrible noise, ________brought her heart into her mouth. (NMET91)A. itB. whichC. thisD. that5.Is this the restaurant___________?A. which you workB. in which you workC. for which you workD. where you work in6.That tree, the leaves ________are almost yellow, is a very old one.A. whoseB. of whichC. in whichD. on which7.There was nothing ________we could do to stop the traffic accident.A. thatB. \C. whichD. A&B8.He is a man with a large collection of stamps ________gave me a wonderful stamp.A. thatB. whoC. whomD. A&B9. That is one of the books _________are worth reading very much.A. thatB. whichC. from whichD. A&B10.This is the very book_______ I want to find.A. thatB. whichC. itD. with which11.He paid the boy $10 for washing the windows, most of _______hadn’t been cleaned forat least a year. (NMET90)A. theseB. thoseC. thatD. which12.Because of me poor memory, all _______you told me has been forgotten.A. thatB. whichC. whatD. as13.Do you know the girl_________?A. whom he often talkB. he often talks toC. to who he often talks C. so that he often talks14.That is the most difficult problem________ I have ever met.A. thatB. whatC. whichD. whom15. The reason _________ he called you is to ask you to come to our picnic.A. whyB. for thatC. whichD. for why。
