高中定语从句精讲与练习与答案
(完整版)高中英语定语从句讲解及练习题(含答案)
定语从句讲解一．基本介绍❶功能：相当于adj,修饰名词或代词，在句中作定语。
❷位置：被修饰词之后❸先行词：被定语从句修饰的词❹关系词：连接先行词与从句的词称为关系词。
❺确定关系词的步骤：先看先行词，指的是什么；看关系词在充当的成份。
二．特殊用法1.He was looking pleasantly at the children and parcels______filled his bus.2.The village is no longer the one ___it was five years ago. 5.Such books____you bought are useful.23.Which are the books____you bought for me? 6.____ is known,the earth is round.4.There is a room,_____window faces the river. 7.There is lots of air in loose snow,_____can keep the cold out.3高中定语从句练习（整理）1. They talked for about an hour of things and persons _____ they remembered in the factory.A. whichB. thatC. whoD. whom2. We are going to spend this Spring Festival in Beijing, _____ live our grandparents and some relatives.A. whichB. thatC. whoD. where3. There are many areas in the world _____ lack experienced doctors.A. whereB. in whichC. whichD. what4. The years and months _____ we spent together are really wonderful to us all.A. whenB. on whichC. in whichD. that5. _____ has been described above, it is a general rule that solids expand as the temperature increases and contract when they are cooled.A. ItB. AsC. ThatD. Which6. A. who’s B. which C. whose7. Susan is not the brilliant writer _____ she used to be. D. thisA. whichB. thatC. whoD. whom8. I, who _____ your friend, will try my best to help you.A. beB. amC. areD. is9. The size of the audience, _____ we had expected, was well over 1600.A. asB. thatC. whichD. who10. They have started an investigation, _____ are being kept secret.A. whose detailB. whose the detailsC. the details of whichD. the detail of it11. Have you ever asked him the reason _____ may explain his absence?A. whyB. for whichC. whichD. what12. There were two rooms in the beach house, _____ served as a kitchen.A. the smaller of themB. the smallest of whichC. the smaller of whichD. smallest of which13. He imagined various ways _____ he could teach her how to learn English well.A. /B. thatC. in whichD. A , B & C14. The speed _____ light travels is said to be the maximum in the universe.A. in whichB. by whichC. at whichD. from which15. Can you think out a situation _____ this idiom can be used?A. in whichB. thatC. whereD. A & C16. China has hundreds of islands, _____ is Taiwan.A. in which the largestB. its largest of whichC. of which the largestD. which the largest17. We ate in a luxurious restaurant but it wasn’t such a good dinner _____ she had promised us.A. thatB. whichC. asD. what18. They stayed with me for three weeks, _____ they drank all the wine I had.A. whichB. which timeC. during whichD. during which time19. She was dressed in the same way _____ she was when I saw her last time.A. thatB. asC. onceD. in which20. The fire started on the first floor of the hospital, _____ patients are mostly elderly people.A. itsB. whichC. whoseD. their21. The company official _____ I thought would be fired received a raise.A. whomB. whoeverC. whoD. of whom22. Alec asked the policeman _____ he worked to contact him whenever there was an accident.A. with himB. whoC. whomD. with whom23. We are living in an age _____ many things are done on computer.A. at whichB. thatC. whenD. which24. The factory produces half a million pairs of shoes every year, 80% _____ are sold abroad.A. whichB. which ofC. of whichD. of that25. The road conditions there turned out to be very good, _____ was more than we could expect.A. itB. whichC. whatD. that26. He’s such a good teacher _____ we all love and respect.A. thatB. as C who D. whom27. Today, more and more people are concerned about the way _____ the environment is being destroyed.A. whichB. in thatC. in whichD. how28. The old man finally got a chance to visit the school, _____ he used to study, _____ he had beendreaming of for years.A. that…whichB. where…thatC. in which…whatD. where…which29. This is the least interesting book _____ during my holidays.A. that I have ever read itB. what I have ever readC. I have ever readD. which I have ever read30. The result is not the same _____ they had expected, _____ was rather disappointing.A. which…asB. as... thatC. that…whichD. as…which31. We interviewed the old lady, _____ had been killed in the air crash last week.A. whose all childrenB. all her childrenC. all of her childrenD. all of whose children32. There are altogether eleven books on the shelf, _____ are mine.A. of which fiveB. in which fiveC. five of whichD. A & C33. ---Is this dictionary _____ you want to buy?---Yes, this is the very dictionary _____ I need.A. which…thatB. the one…whichC. the one…/D. the one that…which34. I’ll give you my friend’s home address, _______ I can be reached most evenings.A. whichB. whenC. whomD. where35. The friendship is like health, _____ is seldom known until it is lost.A. its valueB. the value of itC. the value of whichD. whose the value36. I can think of many cases _____ students obviously knew a lot of English words and expressions butcouldn’t write a good essay.A. whichB. in whichC. whereD. B & C37. The artist _____ the judge gave a prize is the teacher _____ I have been taught painting for two years.A. from whom…by whomB. to whom…whoC. to whom…by whomD. from whom…who38. American women usually identify their best friend as someone _____ they can talk frequently.A. whoB. asC. about whichD. with whom39. Last night I took a taxi, _____ took me straight home.A. and itB. itC. whichD. A & C40. I shall never forget the days _____ I lived in the countryside with the farmers, _____ has a great effecton my life.A. when…thatB. when…whenC. when…whichD. which…which41. The town _____ you visited last month is the one _____ Einstein was born.A. where…whereB. which…whichC. that…whereD. that...which42. He’s got himself into a dangerous situation _____ he is likely to lose control over the plane.A. whereB. whichC. at whichD. in that43. Tom’s mother kept telling that he should work harder, _____ didn’t help.A. but itB. asC. whichD. A & C44. I’m looking for a present for my mother’s birthday, _____ she can use and at a reasonable price.A. thatB. oneC. whatD. which45. There isn’t much _____ I can do, _____ makes me disappointed.A. that…whichB. which…thatC. that…thatD. which…which46. That e-book is no larger than an ordinary book with a screen _____ you can read novels.A. in whichB. thatC. whereD. of which47. "Who moved my cheese?”, _____ is a best-selling book, is written by Spencer Johnson.A. whichB. thatC. itD. whose48. Shirley said that she would have a two-week holiday in July, _____ I think, is impossible.A. itB. thatC. whenD. which49. It was an exciting moment for these football fans this year, _____ for the first time in years their teamwon the World Cup.A. thatB. whichC. whenD. while50. I was so angry at all _____ he was doing _____ I walked out.A. that…thatB. which…thatC. which…whichD. /…which51. The moment he set his foot in the new country, to his great surprise, he was surrounded by friendlypeople_____ he could turn for help.A. from whomB. to whomC. on whomD. by whom52. It was not until Mum agreed to take her to KFC, _____ was her favorite, _____ the spoilt girl stoppedcrying.A. that…thatB. that…whichC. which…thatD. which…which53. You can use a large plastic bottle, _____ cut off, as a pot to grow flowers in. Which is wrong?A. the top of which isB. whose top isC. its top isD. with its to54. The British are not so familiar with different cultures and ways of doing things, ______is often thecase in other countries.A. thatB. soC. whatD. as55. Keep the drug _____ is out of children reach.A. in a place whereB. whereC. in a place whichD. in which56. When we talk about the cities in United States, the first _____ comes into our mind is New York.A. oneB. cityC. thatD. which57. He arrived in Shanghai in 2003, _____, some time later, he became a teacher.A. whenB. whereC. thatD. which58. The challenge is to create a system, _____ the farmers can teach the world about plant medicine.A. whereB. whichC. whenD. for which59. Jogging on the road was one of the reasons _____ 21 people, including 20 students and 1 teacher, diedand another 16 were injured in the accident in Shanxi Province.A. becauseB. whichC. for whichD. how60. It was in the Beihai Park, _____ they made a date for the first time _____ the old couple told us their love story.A. where…thatB. that…whereC. that…thatD. where…when定语从句Key1. BDCDB 6. CBBAC 11. CCDCD 16. CCDBC 21. CDCCB 26. BCDCD 31. DDCDC 36. DCDDC 41. CADB A 46.CADC A 51.BCCDC 56. CBACA。
完整版)高中英语定语从句讲解及练习
完整版)高中英语定语从句讲解及练习定语从句是高中英语的重点知识，也是高考常考点。
本文将主要讲解关系代词引导的定语从句，并解释关系副词引导的定语从句，包括判断关系代词与关系副词限制性和非限制性定语从句等内容，并提供例题讲解。
定语从句在句中作定语，修饰一个名词或代词，被修饰的名词词组或代词即先行词。
通常出现在先行词之后，由关系词（关系代词或关系副词）引出。
关系代词有：who。
whom。
whose。
that。
which等。
它们代替的先行词是人或物的名词或代词，并在句中充当主语、宾语、定语等成分。
当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。
例如，当先行词是人时，可以使用who或whom作为关系代词。
如：Is he the man who/that wants to see you?（他就是你想见的人吗？）关系代词在从句中作主语。
而当先行词是物时，可以使用which或that作为关系代词。
如：The package（which / that）you are carrying is about to come unwrapped.（你拿的包快散了。
）关系代词在从句中作宾语。
除了who。
whom。
whose。
that。
which，还有关系副词when。
where。
why等。
关系副词引导的定语从句也可以修饰一个名词或代词。
例如：I still remember the day when we met.（我仍然记得我们相遇的那一天。
）关系副词when在从句中作时间状语，修饰先行词day。
总之，掌握定语从句的用法和关系词的选择是英语研究的重要内容。
通过不断的练和实践，相信大家可以掌握这一技能。
关系副词可以代替时间、地点或理由的名词，在从句中作状语。
例如，关系副词when。
where。
why的含义相当于“介词+ which”结构，因此常常和“介词+ which”结构交替使用。
比如，有时候我们必须屈服，这是任何人都会遇到的情况（There are ns when [on which] one must yield）。
高考英语语法定语从句讲解与练习附答案
定语从句与高考定语从句是高考的热点，主要考查关系代词和关系副词的正确运用，特别是它们在非限制性定语从句中的运用。
主要考点有：1.关系代词who, which, that, whom, as, whose的基本用法。
2.关系副词when, where, why的基本用法。
3.定语从句中关系词的特殊用法。
4.定语从句中“介词＋关系代词”介词的确定。
5. which/ as引导的非限制性定语从句的区别。
一、定语从句的分类限制性定语从句定语从句非限制性定语从句二、限制性定语从句和非限制性定语从句的区别区别一：形式不同限定性定语从句主句和从句之间不用逗号隔开；而非限定性定语从句与主句之间通常____用___逗号隔开。
区别二：功能不同限定性定语从句用于对先行词的意义进行修饰、限制和识别，如果去掉，就会造成句意____不明确___；而非限定性定语从句用于对先行词起补充说明作用，如果省略，句意不影响。
如：People who take physical exercise live longer. 进行体育锻炼的人活得长些。
(若把从句去掉句子就失去意义)His daughter, who is in Boston now, is coming home next week. 他女儿现在在波士顿，下星期回来。
(若把从句去句子意义仍然完整)比较下面的两个句子：I have a sister who is a doctor. 我有一个当医生的姐姐。
(姐姐不止一个)I have a sister, who is a doctor. 我有一个姐姐，她是当医生的。
(只有一个姐姐)区别三：翻译不同在翻译定语从句时，一般把限定性定语从句翻译在它所修饰的先行词之前，而把非限定性定语从句与主句分开。
如：He is the man whose car was stolen. 他就是汽车被窃的那个人。
I’ve invited Jim, who lives in the next flat. 我邀请了吉姆，他就住在隔壁。
高中定语从句讲解与练习（附答案）
高中定语从句讲解与练习（附答案）定语从句专项讲解与练习1、定语从句在句中修饰某个名词或代词，被定语从句修饰的词叫先行词。
定语从句需用下列关联词：关系代词和关系副词。
它们起连词作用，本身做从句的主语、宾语、表语或定语，本身在从句中作时间、地点或原因状语。
主要有who, whom, that, whose, which, as, when, where, why。
PS:what不能引导定语从句. 指人的关系代词有who、whose、whom、that. 指物的关系代词有which、whose(=of which)、that.The old man who/whom /that we visited yesterday is a famous artist.Miss Wang is taking care of the child whose parents have gone to Beijing .The man with whom my father shook hands just now is our headmaster. （=The man who/whom/ that my father shook hands with just now is our headmaster.）I like the books which / that were written by Lu Xun.The desks (which/that) we made last year were very good.This is the house in which we lived last year. (= This is the house which /that we lived in last year.)I live in the room whose windows face south. (= I live in the room ,the windows of which face south.)2、掌握以上关系代词、关系副词的含义及使用时，要特别注意以下几点：1）指人时宜用who 的情况：a. 当先行词是one, ones, anyone 或those , these 时，关系代词用who。
高中定语从句语法详解及练习题有答案
定语从句定语从句用来充当句中定语的主谓结构；它主要用于修饰句子中的名词、代词。
而定语从句的位置常常是紧跟在被修饰的名词、代词的后面。
在被修饰的名词、代词与定语从句之间往往有一个关系词将其前后两部分联系成一个整体，或是构成一个名词短语；或是构成一个代词短语。
但从结构上说，关系词与从句是一个整体。
排除句子的其他各部分，这种带有定语从句的名词短语或是代词短语的构成可演示如下：例：those who drink a lot 那些大量饮酒的人在这个带有定语从句的代词短语中：those是：被修饰的名词；who是：关系词;who drink a lot是：定语从句通过上面的演示,我们可以归纳出定语从句在句子中的位置、结构如下：被修饰的名词/ 代词+ 关系词+ 句子(其中，"被修饰的名词/代词"在语法叫作"先行词".)Ⅰ. 概念：(1) 定语从句：在主从复合句中用作定语的从句叫定语从句。
定语从句一般紧接在先行词(antecedent)后面。
(2) 先行词：被定语从句修饰的成份。
先行词可以为一个词，短语，或整个主句。
(3) 引导定语从句的词叫关系词，分为关系代词和关系副词。
关系词的作用：1) 引导定语从句，连接主句和从句，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）常用的关系代词: that、which、who、whom、whose、as 、but (文语, 置于否定词之后=that/who…not…, "没有……不……", 在从句中作主语，宾语)常用的关系副词（在从句中只作状语）: when、why、whereThe student who answered the question was John.I know the reason why he was so angry.The boy (whom) you are talking to is my brother.I'd like a room whose window looks out over the sea.定语从句三步：第一找出先行词；第二看先行词在定语从句中的语法功能（做主语、宾语或状语）；第三选择合适的关系词。
高中定语从句全面详细讲解附练习题加答案
高中定语从句详细讲解在复合句中，修饰某一名词或代词，用作定语的从句叫做定语从句(attributive clause)。
被定语从句所修饰的词叫做先行词(antecedent)。
定语从句必须放在先行词之后。
引导定语从句的关联词有关系代词who、whom、whose、which、that和关系副词when、where、why等。
Finally, the thief handed everything that he had stolen to the police.最后，那个小偷向警察交出他偷的所有的东西。
（引导词是关系代词that）His parents wouldn't let him marry anyone whose family was poor.他父母不让他和家庭困难的人结婚。
（引导词是关系代词whose）In the dark street, there wasn't a single person to whom she could turn for help.在那个黑暗的街道上，没有她可以求助的人。
（引导词是关系代词whom）In 1519 another traveller who went to America from Europe discovered the tomato.1519年另一位从欧洲去美洲的旅行家发现了西红柿。
（引导词是关系代词who）I still remember the day when I first came to Beijing.我仍然记得第一次去北京的那一天。
（引导词是关系副词when）This is the house where we lived last year.这就是我们去年住的房子。
（引导词是关系副词where）二、关系代词和关系副词的功用能关系代词和关系副词用来引导定语从句，在先行词和定语从句之间起纽带作用，使二者联系起来。
高中英语定语从句语法精讲练习(带答案)
高中英语语法讲解——定语从句(名师精讲必考语法知识点+实战训练，建议下载练习)一、先行词、关系代词和关系副词1．先行词(antecedent)就是被定语从句所修饰的名词。
在英语中，定语从句跟在被修饰词之后，所以被修饰词就是“先行”的词。
eg. The lovely girl often helps the old lady.She lives next door to our school.→The lovely girl who lives next door to our school often helps the old lady.→The lovely girl often helps the old lady who lives next door to our school.The lovely girl often helps the old lady.You met her at school yesterday.→The lovely girl (whom)you met at school yesterday often helps the old lady.→The lovely girl often helps the old lady (whom) you met at school yesterday.2．连接定语从句，要用关系代词(relative pronoun)和关系副词(relative adverb)。
关系代词和关系副词与连接词不完全相同，因为它们除了连接主句和定语从句，还在定语从句中代替一定的成分。
eg. The book which I bought yesterday is very interesting.← The book is very interesting. I bought the book yesterday.I have visited the house where Andersen wrote The Emperor’s New Clothes.←I have visited the house. Andersen wrote The Emperor’s New C lothes in the house.二、关系代词1．who的先行词是“人”，在从句中代替主语。
高中定语从句全面详细讲解附练习题加答案
高中定语从句详细讲解【摘要】定语从句是一种形容词的关系从句。
它由关系代词或关系副词引导（1）。
初中英语中的定语从句仅限于限制性定于从句，但对初中生来说，定语从句既是一个重点，也是一个难点。
【关键词】定语从句先行词关系代词关系副词一、英语中的定语从句与汉语中的定语位置不同。
在复合句中，修饰某一名词或代词的从句叫做定语从句。
英语中的定语从句始终要放在被修饰的词之后，而汉语中的定语则放在被修饰词之前。
如：The man who / that I saw at the school gate yesterday is my English t eacher.先行词定语从句昨天我在校门口看见的那个人是我的英语老师。
二、英语从句中的句型结构比较复杂，有先行词、关系代词或关系副词。
被定语从句修饰的词叫先行词，引导定语从句的关联词有关系代词或关系副词。
限制性关系分句和它的先行项的所指意义有着不可分割的联系（2）。
关系代词或关系副词放在先行词和定语从句之间起纽带作用，关系代词或关系副词在定语从句中要充当一个成分。
关系代词在句中可作主语、宾语或定语，关系副词在句中作状语。
如：I am waiting for the boy who /that is wearing a red coat. （主语）先行词关系代词我正在等穿着红色外套的那个男孩。
The dictionary that / which my sister gave me last Sunday is very ex pensive.(宾语)先行词关系代词我姐姐上周星期天给我的那本字典很贵。
The woman is his mother whose name is Linda Brown. (定语)先行词关系代词那个是他的母亲，名叫琳达·布朗。
That is the house where my father used to live.(状语)先行词关系副词那是我父亲曾经居住过的房子。
高中英语语法基础 ——定语从句知识点总结归纳讲解(附同步练习)(有答案)
高中英语语法基础——定语从句知识点归纳讲解（附同步练习）★先行词：被定语从句修饰的名词或代词叫先行词。
通常情况下，引导词前面的名词即为从句的先行词。
★关系词：引导定语从句的词叫关系词。
也可以称作引导词。
①关系代词：who，whom，which，that，whose，as，在从句内作主语、宾语等名词性成分。
②关系副词：when，where，why在从句内作状语。
（一）. 使用who、whom、which、that的定语从句1. whoThis is the boy who plays basketball very well.This is the teacher who is teaching us English.▲who 指人, 在从句中作主语。
2. whomThis is the boy (whom) I often help.The man is our headmaster (whom) you met just now.I met the girl (whom) you often praise.▲whom 指人,在从句中作宾语, 可省略。
3. whichThis is the farm which keeps many cows.This is the farm (which ) I visit every year.▲which 指事物, 在从句中作主语或宾语,作宾语时可省略。
4. that以上三种情况均可用that。
指人或指物，可作主语和宾语，作宾语时可省略。
（二）. 使用whose的定语从句Do you know the girl whose father is mayor.I used to work in an office whose window faces north.I work in a school whose students are excellent.▲whose 指人或物的所属关系，表示“某人的”或“某物的”。
高中定语从句全面详细讲解附练习题加答案
高中定语从句详细讲解〔一〕定义及相关术语1．定语从句：修饰某一名词或代词的从句叫定语从句。
定语从句一般紧跟在它所修饰的先行词之后。
2．先行词：被定语从句修饰的词叫先行词。
3．关系词：引导定语从句的词叫关系词。
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；关系副词有when, where, why等。
关系词通常有以下三个作用：A、引导定语从句；B、替代先行词；C、在定语从句中担当一个成分。
例如：The man who is shaking hands with my father is a policeman. 该句中，who is shaking hands with my father 是定语从句，修饰先行词the man，“who〞是引导定语从句的关系词，替代先行词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。
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. 昨天我援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。
Mr Liu is the person ( whom ) you talked about on the bus. 刘先生就是你们在公共汽车上谈论的那个人。
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定语从句1什么是定语从句？由一个完整的句子充当定语的从句为定语从句。
2特点：和其它类从句比较，除了有引导词（关系词）定语从句有“先行词”。
3什么是先行词：被定语从句修饰的名词/代词为先行词。
4定语从句的种类：限定性定语从句和非限定性定语从句。
5定语从句引导词（关系词）的种类：关系代词和关系副词。
例：I work in a school which was built 50 years ago.在此句中”school”为先行词，which 来引导定语从句，“which was built 50 years ago.”整句话来修饰先行词做定语，所以这是个定语从句。
注：定语从句的引导词通常置于先行词之后引导定语从句。
（一）代词性引导词和副词性引导词，即关系代词和关系副词。
代词性引导词有：that,which,who,whom,whose,as等，副词性引导词有：when,where,why等，代词性引导词在定语从句中充当主语/宾语，副词性引导词在定语从句中充当状语。
注：what 不能引导定语从句，因为what从句属于名词性从句。
（二）基本用法。
1．先行词性质不同要使用不同的引导词，先行词指人时，可用that,who,whom代指，who与whom的区别在于who是主格，在从句中作主语，whom是宾格，在从句中作宾语，而that作主语/宾语均可。
先行词指物时，用that/which代指，可见，that既可代指人的先行词，也可代指物的先行词。
例：Do you know the man that is standing by the door?此句that 引导定语从句，代指先行词the man.例：This is the book that I have been looking for .此句that引导定语从句，代指先行词the book.例：This is the book which I have been looking for.此句which引导定语从句，代指先行词the book.例：Do you know the man who is standing by the door?此句who 引导定语从句，代指行行词the man,作从句的主语。
也可用that引导从句，如” Do you know the man that is standing by the door?”例：The lady whom we saw this morning is Mrs.Brown.此句whom引导定语从句，代指先行词the lady，在从句中作宾语。
也可用that引导即“The lady that we saw this morning is Mrs.Brown.”例：As is known to all,China is a large country.As is know to all是个很常用的表达方式，这也是的定语从句，只不过它的位置不像别的定语从句在先行词的后面，本句as代指主句的含义“中国是个大国“。
As是一个特殊的引导词，引导定语从句时为代词。
不像其他的代词性引导词用来代指一个具体的先行词，as代指整个主句的含义，which引导非限定性定语从句时，也有类似的用法。
例：He is often late,which makes his teacher angry.此句which引导定语从句，代指主句的含义“他经常迟到“，作从句的主语，这时which 引导的就是非限定性定语从句。
Which和as的用法相似，但也有区别。
（1）which引导的定语从句只能位于主句后，但as引导的从句在主句前，中，后均可，在主句前居多。
（2）as常理解为“正如，正像“而which常理解为”这，这事，这点“（3）as常用的固定搭配有，as is often the case,as was expected,as often happens,as is known to all,as hasbeen said before,as is mentioned above等2．副词性引导词。
副词性引导词when.where,why.例：I often think of the happy days when I was in France. When引导定语从句，修饰先行词days意为“in the happy days”作从句的时间状语。
例：This is the building where my father works.Where引导定语从句，修饰先行词building，意为“in the building”，作从句的地点状语。
例：Do you know the reason why he was late.Why引导定语从句，修饰先行词reason意为“for the reason”，作从句的原因状语。
说明：从以上的例子可以看出，代词性引导词在从句中作主语/宾语，副词性引导词在从句中作状语。
注：如果引导词在从句中作宾语，则引导词可以省略。
(一)限定性定语从句和非限定性定语从句的比较。
限定性定语从句与先行词的关系密不可分，不可用逗号分开。
而非限定性定语从句只是到先行词起补充说明作用，与先行词关系松散，通常用逗号将其分开，非限定性定语从句不能用that代指先行词。
例：This is the photo that/which I took.The famous basketball player,who tried to make a comeback,attracted a lot of attention.（二）that与which的区别。
当先行词指物时才需要讨论这个问题。
1．当先行词为不定代词，如anything,everything,nothing,none,one,all,little,few,much等，或先行词被all,little,few,much,any,only,theevery,every,no等修饰时，要用that代指先行词。
例：All that is needed is a supply of oil.Finally,the thief handed everyting that he had stolen to the police.This is the only problem that remains to be settled.2.先行词是序数词/最高级形容词时，或先行词被序数词，最高级形容词，具有最高级意义的形容词（如last）修饰时，要用that作引导词。
例：This is the first/best film that I have seen since I came here.3.先行词同时包括人和物时，要用that作引导词。
例：They often talk about the people and the things that they like most.(三)不能用that引导的定语从句。
1.在非限定性定语从句中不能用that，而用who,whom,which等代指先行词。
例：I saw Mary just now,who seemed very excited.2.介词后不能用that。
例：This is the person to whom your father spoke just now.3.当先行词是all,any,few,one(s),anyone,everyone,those,people等且指人时，只能用who,不用that.例：Those who are present will have the chance to see thefilm star.(四)as与which代指主句的含义。
有的定语从句并不修饰一个具体的先行词，而是修饰整个主句，由which/as引导，这时which和as都代词性的，代指主句的含义，但是用法不同，上文有讲。
例1：_____is often the case,we have worked out the production plan.A. WhichB.WhenC.WhatD.As例2：_____is mentioned above,the number of the studentsin senior school is increasing.A．Which B.As C.That D.It例3：Helen was much kinder to her youngest son than to the others,____,of course,made the others envy him.A.whoB.thatC.whatD.which.例4：He made another wonderful discovery,____of great importance to science.A.which I think isB.which I think it isC.which Ithink it D.I think is例5：The weather turned out to be very good,____was morethan we could expect.A. whatB. whichC.thatD.it.(五)先行词前有such,so,the same修饰时。
这种情况下，定语从句用as引导，as代指先行词，在从句在作主语/宾语。
例：1.She is such a kind teacher as we all like.2.She is so kind a teacher as we all like3.She is such a kind teacher that we all like her.1和2句均为定语从句，先行词均为teacher,分别用了such a kind teacher和so kind a teacher结构，含义是一样的。
先行词有such/so修饰，要用as.在这两个句子中，as代指先行词，逻辑语序为we all like as,as作宾语。
句3用了such……that……结构that本身没有含义，也不是从句的成分，只是起到引导的作用，从句的主谓宾分别为，we,like,her。
这个问题的解题技巧是看从句是否主谓宾完整，如缺少宾语，必然要用引导词作宾语，选择as,如从句成分完整，选that,组成such……that…..结构。
例1．This is such a difficult problem____none of us can work it out2．This is such a difficult problem____none of us can work out3．This is a difficult problem____none of us can work out. 句1是个完整的句子，用that.句2从句中缺少宾语，且problem有such修饰，故是定语从句，用引导词as，句3从句缺少宾语，为定语从句，但没有such,so,the same修饰，故用that/which代指先行词。