外研版必修三语法之非限制性定语从句详细和练习(有答案)
外研版必修3 Module 6非限制性定语从句用法练习题及答案
Module 6 非限制性定语从句用法专练一、单项选择。
1. I have many friends, ________ some are businessmen.A. of whomB. from whichC. who ofD. of who2. Jim passed the driving test, ________ surprised everybody in the office.A. whichB. thatC. thisD. it3. We will be shown around the city: schools, museums and some other places,________ other visitors seldom go.A. whatB. whichC. whereD. when4. The famous basketball star, ________ tried to make a comeback, attracted a lot of attention.A. whereB. whenC. whichD. who5. Have you seen the film Titanic, ________ leading actor is world famous?A. itsB. it'sC. whoseD. which6. Recently I bought an ancient Chinese vase, ________ was very reasonable.A. which priceB. the price of whichC. its priceD. the price of whose7. She heard a terrible noise, ________ brought her heart into her mouth.A. itB. whichC. thisD. that8. I shall never forget the day ________ Shen ZhouⅤ was launched, ________ hasa great effect on my life.A. when; whichB. that; whichC. which; thatD. when; that9. This is the book I bought yesterday, ________ I spent 8 yuan.A. in whichB. for whichC. on whichD. at which10. There are two buildings, ________ stands nearby a hundred feet high.A. the largerB. the larger of themC. the larger one thatD. the larger of which二、同义句转换。
限制性非限制性定语从句详解+练习(附答案)
定语从句用来说明主句中某一名词或代词（有时也可说明整个主句或主句中一部分）而起定语作用的句子叫作定语从句。
一．词引导的定语从句1. 关系代词用来指代先行词是人或物的名词或代词句子成分用于限制从句或非限制性从句只用于限制性从句代替人代替物代替人或物主语 Who which that主语 Whom which that宾语 Whose(=of whom) whose(=of which)例1：This is the detective who came from London.例2：The book which I am reading is written by Tomas Hardy.例3：The desk whose leg is broken is very old.例4：This is the room that Shakespeare was born in.2．关系代词的用法(1) 如果先行词是all, much, anything, something, nothing, everything,little, none等不定代词，关系代词一般只用that，不用which。
例如： All the people that are present burst into tears.(2) 如果先等词被形容词最高级以及first, last, any, only, few, much, no, some, very等词修饰，关系代词常用that,不用which, who，或whom。
例如：(3) 非限制性定语从句中，不能用关系代词that,作宾语用的关系代词也不能省略。
例如：There are about seven million people taking part in the election, mostof whom、are well educated.(4) which还有一种特殊用法，它可以引导从句修饰前面的整个主句，代替主句所表示的整体概念或部分概念。
高一英语外研社版必修三-语法复习：定语从句和非限制性定语从句
高一英语外研社版必修三语法复习：定语从句和非限制性定语从句课程目标：一、学习目标1. 定语从句的基本用法以及关系词的用法。
2. “介词+关系代词”引导的定语从句。
3. 非限制性定语从句及其和限制性定语从句的区别。
二、重点、难点重点：定语从句的基本用法。
！难点：定语从句中个别关系词的使用，及其和某些名词性从句的区别。
三、考情分析1）定语从句是每年高考的重点，主要分布在单项选择、完形填空中，书面表达要注意定语从句的使用。
定语从句的掌握与否还会影响阅读能力的提高。
2）每年的高考题中，单项选择题中定语从句的分值一般为1—2分。
完形填空中也会有一、两个空考查定语从句。
知识梳理：一、定语从句【教材原句】Ancient China was a place where states were often at war with each other.？古代的中国是个国家之间经常发生战争的地方。
But it was also a time when there were many great philosophers.但也是个产生许多伟大哲学家的时代。
Confucius is the philosopher whose influence has been the greatest.孔子是影响最大的哲学家。
Mozi was another teacher who was very influential.墨子是另外一个影响力巨大的学者。
He came from a family which was very poor.;他来自一个贫穷家庭。
【用法1】1. 定义：在句中起定语的作用，修饰某一名词或代词，或修饰整个句子的从句叫做定语从句。
2. 基本构成：被定语从句所修饰的词叫做先行词。
定语从句通常位于先行词之后，由关系词引导。
3. 关系词分类：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where, when, why等。
外研版必修3 module 6语法
非限制性定语从句和定语从句中的省略Ⅰ.用适当的关系词填空1．The Yangtze River，which is more than 6,000 kilometres long，is the third longest river in the world. 2．Sun Yat-sen，who was the leader of the 1911 Revolution，first suggested the idea in 1919.3．His mother，who/whom he loved dearly，went abroad.4．This machine，which he has looked after for many years，is still working perfectly.5．Lucy，whose parents had died，had to make a living by herself.Ⅱ.英译汉1．They set up a state of their own，where they would be free to keep Negroes as slaves.他们自己成立了一个州，在那里，他们可以随心所欲地将黑人们当奴隶。
2．The letter is from my younger sister，who is working in Beijing.这封信是我妹妹写来的，她在北京工作。
3．I saw a good film，which was about the Long March.我观看了一部好电影，是关于长征的。
4．His dog，which he liked very much，died yesterday.他非常喜爱的狗昨天死了。
5．He suddenly fell ill，which prevented him from going to school.他突然生病了，这使得他无法去上学。
非限制性定语从句语法练习+答案
非限制性定语从句练习Ⅰ.用适当的关系词填空1. Mr Smith, _______native language is English, can speak Chinese fluently.2. We will be shown around the city, schools and some other places, ______ other visitors seldom go.3. The factory produces half a million pairs of shoes every year, 80% of ______ are sold abroad.4. is known to all, Madame Curie won the Nobel Prize twice for her great scientific discoveries.5. This is Mr Smith, _______ I think has something interesting to tell you.6. Dorothy was always speaking highly of her role in the play, ________, of course, made the othersunhappy.7. I have invited some friends to the party, most of _______ are from abroad.8. There are two buildings, the larger of _______stands nearly a hundred feet high.9. The children, _____ wanted to play football, were disappointed when it rained.10. He likes Paris, ______ he has lived for a long time.Ⅱ.单句写作1. Last week I passed the examination, ________________________.上周我通过了考试，那是很重要的考试。
外研版高中英语必修3 非限制性定语从句全解
非限制性定语从句全解一、非限制性定语从句的相关特性：1．非限制性定语从句的作用是用来提供附加的而非必要的信息，只是对先行词作进一步的解释、补充或说明。
若去掉此定语从句，句子的主旨大意仍然明确，步的解释、补充或说明。
若去掉此定语从句，句子的主旨大意仍然明确，不会引起误解和太大的歧义。
如：Mr. Li is manager of our company, who you saw at the meeting yesterday.李先生是我们公司的经理，昨天你在会上见过他。
[分析] 本句主要内容是“李先生是我公司经理” ，说话者要侧重表达的信息已完整，而后加上一个非限制性定语从句只是对先行词的进一步补充，提供给对方获得更多的信息内容。
以帮助对方明确所指对象。
2．非限制性定语从句只是先行词的附加补充说明，与先行词之间的关系较为松散，之间有逗号分隔。
We won the final match, which was the last match before we graduated.我们在决赛中获胜了，这是我们毕业前的最后一次比赛。
3．在非限定性定语从句中不能用that 来代指人或物，而应当用who/whom 指人，用来代指人或物，指人，which 指物指人和指物的关系代词在定语从句作宾语时也不能省略。
指人作宾语时只能用宾格whom；不能用who 替换。
如：He takes exercise regularly, which helps to keep him fit.他有规律地从事锻炼，这有助于他保持健康。
（which不能用that代替）Please give the note to Mr. Li, who is standing under the tree. 请将这个便条交给李先生，他正站在树下面。
（who在定语从句作主语，既不能用that，也不能用whom）Miss Yang is our favorite teacher, whom we honor most. 李小姐是我们最喜爱的老师，我们对她最为尊敬。
高一英语 外研版 必修3 定语从句讲义和习题
高中定语从句详细讲解（一）定义及相关术语在复合句中，修饰某一名词或代词的从句叫做定语从句关系代词有：that, which who, whom, whose,等。
关系副词有：when, where, why等。
（二）关系代词引导的定语从句关系词指代在定语从句中充当的成分that 人，物主宾Which 人，物主宾who 人主宾Whom 人宾whose 人，物定1．who 指人，在定语从句中作主语。
The boys who are playing football 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 tomorrow morning. 想去博物馆的人必须在明晨7点到大门口集合。
Yesterday 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 teacher who teaches us physics. 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。
He is the person (whom) you talked about on the bus. 他就是你们在公车上谈论的那个人。
Li Ming is just the boy (whom) I want to see. 李明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 (whom) the teacher often praises is our monitor. 老师常表扬的那个女孩是我们班长。
注意：关系代词whom 在口语或非正式文体中常可用who 来代替，也可省略。
外研版英语 定语从句技巧全解及练习题(含答案)
外研版英语必备英语定语从句技巧全解及练习题(含答案)一、定语从句1．One is filled with knowledge always behaves with elegance（优雅）.A．which B．who C．how D．what【答案】B【解析】【详解】句意：一个学识渊博的人总是举止优雅。
考查关系代词。
A. which关系代词，引导定语从句时，指代物；B. who关系代词，引导定语从句时，指代人；C. how关系副词；D. what不能引导定语从句。
根据One is filled with knowledge always behaves with elegance（优雅）.可知，先行词one指代人，所以用关系代词who或that引导定语从句，同时在定语从句中作主语，结合选项可知B选项符合题意，故答案选B。
2．You Raise Me Up is a song ________ brings me much courage in the face of challenges. A．who B．when C．which D．where【答案】C【解析】【详解】句意：《你鼓舞了我》是一首歌，它带给我面对挑战的勇气。
A. who定语从句关系词，先行词是人；B. when定语从句关系词；做时间状语；C. which定语从句关系词，先行词是物；D. where定语从句关系词，做地点状语。
a song 是物，关系词用which。
根据题意，故选B。
3．﹣Look！This is the photo I took in Beijing World Gardening Expo（世界园艺博览会）in 2019．﹣Wow，so great！A．what B．who C．where D．that【答案】D【解析】【详解】句意：—看！这是我2019年在北京世界园艺博览会拍的照片。
考查定语从句的关系代词，what不用在定语从句中，who先行词为人，在从句中作主语或者宾语，where先行词为地点，在从句中作状语，that先行词为人或物，在从句中做主语或宾语，the photo为先行词，从句中缺宾语，句意理解为﹣﹣看！这是我2019年在北京世界园艺博览会上拍的照片．﹣﹣哇，很不错．故选D。
高中英语非限制性定语从句练习题50题(答案解析)
高中英语非限制性定语从句练习题50题(答案解析)1.She is a kind girl, who is always ready to help others.whichthatwhom答案解析：who。
本题考查非限制性定语从句引导词的用法。
“who”在从句中作主语，指代先行词“girl”，指人且在从句中作主语时用“who”。
“which”一般指代物；“that”不能引导非限制性定语从句；“whom”在从句中作宾语。
2.Mr. Li, who is our English teacher, is very humorous.whichthatwhom答案解析：who。
“who”在从句中作主语，指代先行词“Mr. Li”，指人且在从句中作主语用“who”。
“which”指代物；“that”不能引导非限制性定语从句；“whom”在从句中作宾语。
3.My friend Tom, who I met in the park yesterday, is a good student.whichthatwhom答案解析：whom。
“whom”在从句中作宾语，指代先行词“My friend Tom”，指人且在从句中作宾语用“whom”。
“which”指代物；“that”不能引导非限制性定语从句；“who”在从句中作主语。
4.The woman, who is wearing a red dress, is my aunt.whichthatwhom答案解析：who。
“who”在从句中作主语，指代先行词“The woman”，指人且在从句中作主语用“who”。
“which”指代物；“that”不能引导非限制性定语从句；“whom”在从句中作宾语。
5.The boy, who has big eyes, is very cute.whichthatwhom答案解析：who。
“who”在从句中作主语，指代先行词“The boy”，指人且在从句中作主语用“who”。
外研版必修三语法之定语从句介词+whichwhom详析和练习(有答案)
定语从句（介词+which/whom)观察以下句子：This is the reason for which (=why) he left the company. 这就是他离开公司的原因。
Can you tell me for whom you are working? 你能告诉我你现在为谁工作吗?There are sixty students in our class, all of whom are working hard.班上有60 名学生，他们都在努力学习。
Recently I bought an ancient Chinese vase，the price of which was very reasonable.最近我买了一个中国古代花瓶，价格非常合理。
句子中的引导定语从句的连接词which，whom前都有介词，which和whom都是代替各自的先行词作介词的宾语。
定语从句——定语从句关联词“介词+关系代词”引导的定语从句1. 介词放在关系代词前，关系代词只能用which或whom, 关系代词不能省略。
Is this the house in which Shakespeare was born?这是莎士比亚出生的房子吗？In the dark street, there wasn’t a single person to whom she could turn for help.在黑暗的街道上，没有任何人能让她求助。
2. 在限定性定语从句中，当介词位于定语从句末尾时，可用that/which (指物), that/whom/who（指人）作介词的宾语，且关系代词可以省略。
This is the hero that/who/whom we are proud of.这就是让我们骄傲的英雄。
This is the pen that/which I wrote the letter with. 这就是我用来写信的钢笔。
高中英语非限制性定语从句练习题50题含答案解析
高中英语非限制性定语从句练习题50题含答案解析1.Mary,who is a talented writer,wrote a novel that became very popular.A.who is a talented writerB.which is a talented writerC.that is a talented writerD.when is a talented writer答案解析：A。
本题考查非限制性定语从句中关系代词的用法。
先行词是Mary，指人，在非限制性定语从句中作主语，关系代词用who。
B 选项which 用于指物；C 选项that 不能用于非限制性定语从句；D 选项when 用于指时间。
2.Harry Potter,whose adventures are loved by many,has inspired countless readers.A.whose adventures are loved by manyB.which adventures are loved by manyC.that adventures are loved by manyD.when adventures are loved by many答案解析：A。
先行词是Harry Potter，指人，在非限制性定语从句中表示“……的”，关系代词用whose。
B 选项which 用于指物；C 选项that 不能用于非限制性定语从句；D 选项when 用于指时间。
3.Lincoln,who was a great leader,fought for equality.A.who was a great leaderB.which was a great leaderC.that was a great leaderD.when was a great leader答案解析：A。
先行词是Lincoln，指人，在非限制性定语从句中作主语，关系代词用who。
高中英语非限制性定语从句练习题50题(带答案)
高中英语非限制性定语从句练习题50题(带答案)1. In "Pride and Prejudice", Elizabeth, ______ intelligence and independence are highly praised, finally finds true love.A. whoB. whoseC. whichD. that答案解析：B。
本题考查非限制性定语从句关系词的用法。
先行词是Elizabeth，在从句“intelligence and independence are highly praised”中，Elizabeth和“intelligence and independence”是所属关系，表示“伊丽莎白的智慧和独立”，所以要用关系代词whose。
A选项who在从句中作主语或宾语，主要指代人，但这里不是作主语或宾语的关系；C选项which主要指代物，不能用于指代人；D选项that不能用于非限制性定语从句。
2. "The Great Gatsby", ______ was written by F. Scott Fitzgerald, reflects the American Dream in the 1920s.A. whichB. whoC. whereD. when答案解析：A。
先行词是“The Great Gatsby”，这是一本书，属于物。
在非限制性定语从句中，which可以指代物作主语或宾语，这里作主语，所以选A。
B选项who用于指代人；C选项where在从句中作地点状语；D选项when在从句中作时间状语，都不符合本题要求。
3. Romeo, ______ family was in feud with Juliet's family, fell deeply in love with her.A. whoB. whoseC. whichD. that答案解析：B。
高三英语非限制性定语从句练习题50题含答案解析
高三英语非限制性定语从句练习题50题含答案解析1.Mary,who is very kind,always helps others.A.whichB.thatC.whenD.where答案解析：A 选项which 不能引导修饰人的非限制性定语从句；B 选项that 不能引导非限制性定语从句；C 选项when 是引导时间状语从句的；D 选项where 是引导地点状语从句的。
而who 引导非限制性定语从句，修饰先行词Mary，表示Mary 是非常善良的人，并且总是帮助别人。
2.Tom,who is good at sports,won the first prize.A.whichB.thatC.whenD.where答案解析：A 选项which 不能引导修饰人的非限制性定语从句；B 选项that 不能引导非限制性定语从句；C 选项when 是引导时间状语从句的；D 选项where 是引导地点状语从句的。
who 引导非限制性定语从句，修饰先行词Tom，表示Tom 擅长运动，并且赢得了一等奖。
3.Linda,who has a beautiful voice,sings very well.B.thatC.whenD.where答案解析：A 选项which 不能引导修饰人的非限制性定语从句；B 选项that 不能引导非限制性定语从句；C 选项when 是引导时间状语从句的；D 选项where 是引导地点状语从句的。
who 引导非限制性定语从句，修饰先行词Linda，表示Linda 有一副美丽的嗓音，并且唱歌非常好。
4.Jack,who is tall and handsome,is popular among girls.A.whichB.thatC.whenD.where答案解析：A 选项which 不能引导修饰人的非限制性定语从句；B 选项that 不能引导非限制性定语从句；C 选项when 是引导时间状语从句的；D 选项where 是引导地点状语从句的。
高三英语非限定性定语从句练习题40题含答案解析
高三英语非限定性定语从句练习题40题含答案解析1.Charles Dickens, who is one of the greatest novelists in English literature, wrote many famous novels. In his works, he often described the lives of the poor. “who is one of the greatest novelists in English literature” is a non-restrictive attributive clause.A. which is one of the greatest novelists in English literatureB. that is one of the greatest novelists in English literatureC. as is one of the greatest novelists in English literature答案解析：先行词是Charles Dickens（人），关系代词在非限定性定语从句中作主语，只能用who，不能用which（（指物）、that（（不能引导非限定性定语从句）、as（（引导非限定性定语从句时，通常有固定的用法，在此不适用）。
2.Helen Keller, who overcame many difficulties in her life, became an inspiration to many people. “who overcame many difficulties in her life” is a non-restrictive attributive clause.A. which overcame many difficulties in her lifeB. that overcame many difficulties in her lifeC. as overcame many difficulties in her life答案解析：先行词是Helen Keller（（人），关系代词在非限定性定语从句中作主语，只能用who，不能用which（（指物）、that（（不能引导非限定性定语从句）、as（（引导非限定性定语从句时，通常有固定的用法，在此不适用）。
高三英语非限定性定语从句练习题40题带答案解析
高三英语非限定性定语从句练习题40题带答案解析1.She is a famous actress, who is loved by many people.A. whoB. whomC. whose答案解析：A。
本题中先行词是actress，指人，且在从句中作主语，所以用关系代词who。
2.The writer, whom I admire very much, has won many awards.A. whoB. whomC. whose答案解析：B。
先行词是writer，指人，在从句中作宾语，所以用关系代词whom。
3.The painter, whose works are very valuable, is from France.A. whoB. whomC. whose答案解析：C。
先行词是painter，指人，在从句中表示所属关系，“画家的作品”，所以用关系代词whose。
4.The singer, who has a beautiful voice, is very popular.A. whoB. whom答案解析：A。
先行词是singer，指人，在从句中作主语，所以用关系代词who。
5.The actor, whom everyone respects, is very talented.A. whoB. whomC. whose答案解析：B。
先行词是actor，指人，在从句中作宾语，所以用关系代词whom。
6.The scientist, whose discovery changed the world, is famous.A. whoB. whomC. whose答案解析：C。
先行词是scientist，指人，在从句中表示所属关系，“科学家的发现”，所以用关系代词whose。
7.The author, who writes amazing stories, is very creative.A. whoB. whomC. whose答案解析：A。
高三英语非限定性定语从句练习题40题含答案解析
高三英语非限定性定语从句练习题40题含答案解析1.Mary,who is very kind,always helps others.A.thatB.whichC.whoD.whose答案解析：C。
本题考查非限定性定语从句引导词。
先行词Mary 是人，且在从句中作主语，所以用who。
A 选项that 不能引导非限定性定语从句；B 选项which 引导非限定性定语从句时先行词为物；D 选项whose 在从句中作定语。
2.Tom,who has a great sense of humor,is popular among his classmates.A.thatB.whichC.whoD.whose答案解析：C。
先行词Tom 是人，在从句中作主语，用who。
that 不能引导非限定性定语从句；which 先行词为物；whose 在从句中作定语。
3.Jack,who is good at sports,often participates in various competitions.A.thatB.whichD.whose答案解析：C。
先行词Jack 是人，在从句中作主语，用who。
that 不能引导非限定性定语从句；which 先行词为物；whose 在从句中作定语。
4.Linda,who loves reading books,spends a lot of time in the library.A.thatB.whichC.whoD.whose答案解析：C。
先行词Linda 是人，在从句中作主语，用who。
that 不能引导非限定性定语从句；which 先行词为物；whose 在从句中作定语。
5.Mr.Smith,who is our English teacher,is very strict with us.A.thatB.whichC.whoD.whose答案解析：C。
先行词Mr.Smith 是人，在从句中作主语，用who。
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观察以下句子：1. Xie Lei, who is 21 years old, has come to our university to study for a business qualification.2. She is halfway through the preparation year, which most foreign students complete before applying for a degree course.3. “You have to get used to a whole new of life, which can take up all your concentration in the beginning,” explained Xie Lei, who had lived all her life in the same city in China.4. Living with host families, in which there may be other college students,gives her the chance to learn more about the new culture.5. Cuzco is a lively city with many hotels and inns, where both Indian and Spanish culture and art can be seen.这些句子中斜体词部分都是非限制性定语从句，有关系代词who/ which引导的，句1、句2和句3；有介词+which引导的，句4；也有关系副词引导的，句5。
另外as也能引导非限制性定语从句。
两种定语从句1. 区别例：People who often take physical exercise live longer.经常锻炼身体的人长寿。
(限制性：起限制作用，不能去掉)His daughter, who is in Boston now, is coming home next week.他的女儿现在在波士顿，下周要回来了。
（非限制性：补充说明，译成并列句）2. 用非限制性定语从句的情况：1）关系代词指代整个主句的内容She said she had finished her work, which I doubted very much.她说她已经完成了这项工作，我对此深感怀疑。
2）先行词是世界上独一无二的事物或专有名词The moon, which is 384,400 kilometers away from the earth, creates many beautiful stories. 月球，这个离地球384,400公里远的星球，给人们留下很多美好的故事。
3）先行词指的是某人的惟一某个亲属对比：His brother who is now a lawyer always encourages him to go to college. （限制性）他那个现在是律师的哥哥总是鼓励他上大学。
(他还有其他的哥哥)His brother, who is now a lawyer, always encourages him to go to college. （非限制性）他的哥哥，现在是律师，总是鼓励他上大学。
(他只有一个哥哥)4）“名词/代词/数词+介词+关系代词”结构中此结构常见的有：some (several, a few, many, most, part, the largest) of which/ whom等形式。
有时of which/ whom可以提前到名词/代词等前。
I bought a dozen eggs, six of which (=of which six) broke when I dropped the box.我买了一打鸡蛋，六个在我失手掉了盒子时摔碎了。
He went with a group of people, few of whom were correctly equipped for such a climb.他和一队人一起去了，其中没有几个人配有进行这样一次登山的适当装备。
You’ve made many mistakes, most of which were due to your carelessness.你犯了很多错误，大多数是由于你的粗心。
3.which与as引导定语从句的区别Ⅰ. 限制性定语从句中限制性定语从句的先行词前有as, such, the same时，引导定语从句的关系代词用as不用which。
例如：1. There are as many dictionaries as are needed. 词典你需要多少有多少。
2. I have never heard such stories as he tells.我从没有听过像他讲的这样的故事。
3. He is not such a man as I expected. 他并不是我期待的那样一个人。
4. We are facing the same problems as we did years ago.我们面对着几年前（所面对的）同样的问题。
5. This is the same wallet as I lost. 这个钱包和我丢的那个一样。
注意：是否用as取决于先行词前是否有某些固定的词（as, such, the same）修饰。
Ⅰ. 非限制性定语从句中在非限制性定语从句中，as和which都可以表示一句话、一个整个的情况。
1.which只放在主句后面，而as可在主句前，中，后。
As he realized, I was very useful to him. (在前)正如他所认识到的那样，对他来讲，我还是能帮忙的。
Air, as we know, is gas.（在中）空气，就像我们知道的那样，是气体。
He is a foreigner, as I know from his accent. (在后)他是外国人，我从他的口音中可以听出来。
2. as有“如同…… ,正如……”的含义。
Things will turn out contrary to one’s wishes, as is often the case.结果往往与愿望是相悖的，正如经常发生的那样。
注意：下面这些从句，我们经常放在句首。
as we know我们都知道as has been said above/before 如上所述as has been pointed out 如上所述as is known to all 众所周知turn out contrary to one’s wishes, as is often the case.结果往往与愿望是相悖的，正如经常发生的那样。
from which还是from where1. from which用法比较好理解，可以引导限制性和非限制性定语从句。
There are several books about this on the shelf, from which I chose one and began to read it.那个书架上有好几本有关的书，我选了一本开始读起来。
（from which相当于and from the books）2. from where常用于引导非限制性定语从句，在意义上相当于and from there（从那儿）。
He hid himself in a tree, from where he could see the enemy in the distance.他躲在一棵树上，从那儿他可以看到远处的敌人。
（from where相当于from in the tree）对比分析：He hid himself under the bed, from where he could hear what they were talking.他躲在床下面，他可以从床下听到他们谈话。
分析：from where 可理解为from under the bed，意思是“从床下面”。
但是：He hid himself under the bed, where he could hear what they were talking.他躲在床下面，在床那儿他听到他们谈话。
分析：where可指为“在床边”“在床上”“在床下”等，意思不够明确。
不能用from which。
定语从句的特殊结构一般定语从句紧跟着先行词，但实际运用时，具有较强的灵活性，下面是常见的特殊定语从句。
1. 分隔式：与先行词分离的定语从句The professor entered the hall who had just presented two lectures.刚刚作完两场报告的教授走进了大厅。
2.混杂式：先行词后插入I think, I believe, I guess, I expect, I am sure, they say等。
James is the only one who we expect will win. 詹姆斯是我们认为唯一能获胜的人。
3.省略式：有些定语从句在不引起歧义的情况下，可以省略一些成分，变成“介词+关系代词+不定式”的形式，从而使语句更加明快。
I have saved a sum of money with which to buy (=with which I’d like to buy) a newcomputer for myself.注意：此时主句的主语必须与不定式的逻辑主语一致。
如：I was trying to find a place in which to live (in which I could live).我正在找一处我可以住的地方。
I was trying to find a place in which my brother could live. （不能改为省略式）我正在找一处我弟弟可以住的地方。
定语从句中的主谓一致1. 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一致。
I, who am your close friend, will try my best to help you whenever you are in trouble.我，你的好朋友，当你陷入困境的时候会帮你的。
2.先行词是“one of+复数名词”时，从句谓语动词用复数；而先行词是“the (only) one of ＋复数名词”时，从句谓语动词用单数。