二轮复习英语NO.2再研考点第二层级第二讲定语从句
初中英语二轮专项复习总结之定语从句学习要点
这里as表示“正如数据 所显示的”
非限制性：He mentioned several cases which we can learn from。
这里which引出一个特 定的例子
定语从句的省略形式
关系代词的省略
例如
The book
that/which
I read yesterday is very interesting。在非限制性定语从句中，关系代词 which，whose，whom，as，who等在从句中充当主语或宾语时可以省略。
关系副词的用法
例句：I don't know the reason why she cried.（我不知道她为 什么哭。）。
用来引导定语从句， 修饰地点
例句：I don't know the reason why she cried.（我不知道她为 什么哭。）。
why: 用来引导定语从 句，修饰原因
限制性定语从句和非限制性定语从句的区别
例子 限制性：As we can see from the data, the company is doing well。
非限制性：He mentioned several cases which we can learn from。
关系代词that和which在定语从句中的区别
例子 限制性：As we can see from the data, the company is doing well。
关系代词that和which在定语从句中的区别
这里that指代the person
非限制性：He mentioned several cases which we can learn from。
2021届高三英语二轮复习资料专题二定语从句(1)(附答案)
2021届高三英语二轮复习专题二定语从句（1）考点细则1. 只用which 不用that引导定语从句的情况(1) 当关系代词前面有介词或介词短语时。
(2) 引导非限制性定语从句或指代前面整个句子或句子的部分内容时。
(3) 当关系代词后面有插入语时。
2. 只用that不用which引导定语从句的情况(1) 当先行词是everything, anything, nothing, all, none, few, little, some等不定代词时。
(2) 当先行词被序数词、形容词最高级或the very, the right, the last, the only, any, every, no, all, few, little, much等词修饰时。
(3) 当主句的主语是疑问词who或which时。
(4) 当先行词既有人又有物时。
(5) 当有两个定语从句时，其中一个用关系代词which，另一个宜用that。
3. 关系代词as 的两种典型用法(1) as用作关系代词引导限制性定语从句，并在从句中作宾语、表语等，可构成the same…as…, such/so…as…等结构。
(2) as也可以引导非限制性定语从句，意为“正如”。
as在定语从句中作主语、表语或宾语，这个定语从句说明整个句子，可以放在主句之前。
常用的这种类似插入语的句式有：as is said above, as is already mentioned above; as is often the case, as is discovered, as is reported in the newspaper/ paper, as anybody can see; as often happens etc.4. 选择“介词+关系代词”中的介词的4种常见情形(1) 和先行词的固定搭配。
(2) 根据定语从句中的动词习惯搭配来确定。
(3) 根据定语从句中的形容词习惯搭配来确定。
2022年中考英语二轮专题复习课件——定语从句
后置定语
2. 形容词作后置定语（-able, -ible) 一些以后缀-able 和-ible 结尾的形容词，在意义上有 强烈的谓语色彩和被动意义时，也往往后置。
以a为首做后置定语的形容词还有： alone, alike, afraid, aware, ashamed, awake 等 。
后置定语
1. 形容词作后置定语（a-） 一些以a为词首的形容词作定语时，需要后置。 以a为首做后置定语的形容词还有： alone, alike, afraid, aware, ashamed, awake 等 。 但若这些词有一个状语修饰，则可以前置。
定语从句
I’Im’mBaebarroBwrnobwena.r.
Байду номын сангаас
定语的定义
I’m a brown bear. 定语
定语
定义 修饰、限定、说明 名词或代词的品质与 特征的词。
种类
名词、代词、数 词、介词短语、动词 不定式 （短语）、 分词、定语从句等… 相当于形容词的词、 短语或句子都可以作 定语。
例：He is the only person reliable. I know the actor suitable for the part.
后置定语
3. 形容词修饰不定代词
例：I'd like something cheaper. There is something strange in the sky. She doesn't like eating anything sweet.
高考英语二轮复习 语法部分之定语从句
2012届高考英语二轮专题复习精品语法部分之定语从句定语从句是由先行词+关系代词/关系副词引导的从句构成。
所谓的先行词，其实就是汉语中被修饰的中心词。
我们称它为先行词，是因为它的位置跟汉语中的位置是不一样的。
一般来说汉语句子中喜欢把把作修饰的定语成分放在被修饰的中心词之前。
而英语中，如果是单个形容词修饰，可以放在中心词之前；如果是短语或句子（从句），则要放在他们所修饰的中心词之后，也就是说要后置。
也就是这样的结构，中心词+句子（作定语成分起修饰作用）。
入乡随俗，人家英国人对此有自己的称呼，“中心词”----先行词，因为放在修饰成分之前。
（先锋官）；“句子（作定语成分起修饰作用）”，被称为定语从句。
先行词可以是单个名词，名词短语，或者是句子。
关系代词： that (表人, 表物，在从句中作主语或宾语)；who (表人, 在从句中作主语)；whom (表人, 在从句中作宾语)which (表物，在从句中作主语或宾语)whose (从句中作定语)关系副词： when (表时间); where(表地点)定语从句是复合句的一种。
复合句就是由两个或以上的句子组成，当然其中有组合规则，即所谓的语法规则。
I have a goose. The goose lays eight gold eggs every day.我有一只鹅。
这只鹅每天下8个金蛋。
我有一只每天下8个金蛋的鹅。
I have a goose the goose lays eight eggs every day. ( F )I have a goose that/which lays eight eggs every day. ( T )Is he the man who/that wants to see you?He is the man whom/ that I saw yesterday.The man who told me this refused to give me his name．The book is about a girl who falls in love with an ugly but talented boy.The noise that he made woke everybody up．She was annoyed by something that I had said．定语从句分为：限制性定语从句，非限制性定语从句。
2024年中考英语二轮热点题型归纳与演练12句法之宾语从句、定语从句
2024年中考英语二轮热点题型归纳与演练12句法之感叹句、祈使句、疑问句及其它【题型解读】宾语从句为中考的必考点，主要在单项选择题中考查，侧重考查其引导词、语序、时态的应用。
一般至少会涉及两个考查点：①引导词相同，语序和时态不同；②时态一致，语序和引导词不同。
而且通常都会在一些固定的句型中涉及，如I wonder，Would/Could you please tell me, Can you tell me, Do you know, I don’t know等等。
定语从句是在整个句子中充当定语的句子，他的作用就是用来修饰和限定名词的。
引导定语从句的关系代词有：that（指人或物），which（指物），who（指人）。
指人时可用that或who，指物时可用that或which，但有时只能用that不能用which。
常见的情况有下列四种：1. 当先行词是all, any, anything, everything, nothing等不定代词时。
2. 当先行词被形容词的最高级或序数词修饰时。
3. 当先行词有the only, the very, the same, the last等修饰时。
4. 当先行词既有人又有物时，用that不用which。
【命题规律】1. 宾语从句重点考查四个方面，即：时态、语序、引导词和人称。
根据宾语从句语义及语法成分确定连接词: when, where, why, whether/if, how, who, whom等。
宾语从句语法成分齐全时可用that连接，that也可省略。
2. 定语从句关系代词与关系副词的区别。
常见的关系代词包括that，which，who（宾格whom，所有格whose）等，关系副词包括where，when，why等。
关系代词和关系副词放在先行词及定语从句之间起连接作用，同时又作定语从句的重要成分。
一看指人还是物（指人用that、who、whom; 指物用that、which）二看在句中作什么成分（作主语用who、which、that;作宾语用who、whom、which、that; 作定语用whose;作状语用where、when等）三看是否属于特殊情况：即引导词只能用that的情况：（先行词是all、something等不定代词时; 先行词被最高级或序数词修饰时;先行词既指人又指物时)【解题技巧】做此类试题时，首先从语序着手，宾语从句的语序应该为陈述句语序，即：主语+谓语+宾语+其他；再从时态考虑，一般情况下，宾语从句的时态要和主句的时态保持一致，但是，如果有明显的时间状语，要以时间状语来判断时态；最后，再判断疑问词。
高考英语二轮复习专题定语从句课件 (共17张PPT)
• 如：Zhang Minghao is one of the students who/that ________(sstutuddyy) hard.
you have made. • ②He failed in the exam again, which
make his parents disappointed. • ③I like Boxing where I had many happy
memories.
介词+关系代词
• 1.关系副词=介词+关系代词 • 2.介词的选择主要看定语从句中谓语动词的
• 4. he didn’t tell me the reason why he told a lie.
关系词担当的句子成分
• 5.Do you know Tom whose father is policeman?
• 6.As we all know, failure is mother of success
• Guo Honglei is the only one of the students who/that__l_iv_e_s__ (live) in Yangguang XiaoQu.
定语从句需注意的几个问题
• 2.在考查定语从句的时候，经常会挖两个空，除了 定语从句还会涉及到一个强调句型。要善于思考， 找到切入点。
• 7.Tom is a good student, with whom you can study together.
高考英语二轮复习定语从句考点讲解含解析
学习资料高考英语二轮复习定语从句考点讲解含解析班级：科目：定语从句知识点一、定语从句与并列句的区别请观察下面三个句子：1．Wang Hong failed in the College Entrance Examination, ______ disappointed his mother.2．Wang Hong failed in the College Entrance Examination and ______ disappointed his mother。
3．Wang Hong failed in the College Entrance Examination; ______ disappointed his mother。
第一句话:句中有逗号，根据句意可知，空白处的内容应该指的是前面整个句子的内容，是对前文信息的补充说明，因此,此句是非限制性定语从句，用关系代词which；第二句话：句中有并列连词and，因此整个句子是一个并列句，所以可以用代词it指代前面句子的内容。
第三句话：句中有分号，这表明整个句子是一个并列句，因此可以用代词it指代前面句子的内容。
【解题技巧】判断是定语从句还是并列句，要注意句中的标点符号和句中的连接词。
如果句与句之间有连词或者分号，则是并列句;如果是逗号，且逗号后的内容是对前面某一名词的补充说明，则是非限制性定语从句，应该使用关系词.知识点二、“介词＋关系代词"引导的定语从句中介词的选择“介词＋关系代词”引导的定语从句中介词的选择是一个常考点，也是一个难点。
请看下面三个句子,填上合适的介词，并从中发现一些规律。
1．He was educated at a local grammar school, ______ which he went on to Cambridge.2．This is the farm ______ which he worked two years ago。
高考英语二轮复习定语从句课件(53张PPT)
点对点练习 单句语法填空 1.He is the student whose English is always at the top. 2.In our factory there are 2,000 workers，two thirds of whom are women. 3.He is working hard， which will make him pass the final exam. 4. As is known to all，there are 7 continents on the earth.
点对点练习
单句语法填空 1.The dictionary that/which the gentleman bought half an hour ago was very expensive. 2.The lady who is (be) standing behind the counter is my sister. 3.The man who/whom/that I served was wearing a hat. 4.This is the third apple that she has eaten in the afternoon.
playing cellphones.
注释：①先行词表示时间，从句不缺主语或宾语，用关系副词when。②先 行词表示原因，从句不缺主语或宾语，用关系副词why。③先行词表示 地点，从句不缺主语或宾语，用关系副词where。④先行词虽然表示地 点、时间或原因，但是从句缺主语或宾语，仍然用关系代词that/which。
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微小说导入
考点三 when/where/why
Xiao Ming still remembers the day when① he was seriously punished by his father.The reason why② he was punished was that he played
高考英语二轮复习：定语从句(1)(素材)
定语从句一、定义：在句中起定语作用，用于修饰某一名词或代词，或修饰整个主句的从句，叫做定语从句。
先行词：被定语从句修饰的词。
（定语从句通常跟在先行词之后，由关系词引出）Eg: The girl who is singing is my younger sister.先行词引导词（关系代词）二、定语从句的引导词（关系代词/关系副词）：1、引导词的作用：引导定语从句；代替先行词；在从句中充当一定的成分（主语宾语、定语和状语等）2、引导词的用法关系代词：关系副词：3、注意事项：■若介词(of/for/with/about/in/on....)放在关系代词前，关系代词指人时用whom，不可用who 或that；指代物时用which，不能用that。
eg: ①The girl with who/that you talked is my elder sister.(x)②The girl with whom you talked is my elder sister. (√)③The room in that we spent a night is very comfortable.(x)④The room in which we spent a night is very comfortable. (√)■”介词+关系代词“前可有some, any, both, all, neither, none, most, each, few等词。
eg: I love my grandparents deeply, both of whom are very kind to me.三、定语从句的分类（限制性定语从句/非限制性定语从句）1、限制性定语从句限制性定语从句对被修饰的先行词有限定制约的作用，说明先行词的性质、特征、身份和状况等，使该词的含义更加具体明确。
因此，限制性定语从句不能被省略，否则句意不完整。
Eg: A doctor is a person who cures patients.This is the book which I borrowed from my friend yesterday.■注意事项：关系代词一般只用that的情况①若先行词是anything, something, nothing, everything, all, few, little, none, some, every, any, no, much, each等不定代词时，关系代词一般只用that。
2024年中考英语二轮复习语法专项：定语从句课件+
5. 关系副词的用法（了解即可）
1) when表示时间，在从句中作时间状语。如: I still remember the year when you graduated from No. 8 Middle School.
2) where表示地点，在从句中作地点状语。如: That is the school where I studied three years ago.
D. whom
(2023四川遂宁中考)
3. Tea is the leaf of a plant ___C_____ grows widely in China,
Japan and other countries.
A. what
B. who
C. that
(2023湖南郴州中考)
4. Lei Feng is a great person ____A____ sets a good example to us.
6. The book sells well. The book was written by the young writer. T_h_e__b_o_o_k__w_h_i_c_h_/_t_h_a_t_w__a_s_w_r_i_tt_e_n__b_y_t_h_e_y_o_u__n_g_w__ri_t_e_r_s_e_ll_s_w_e_ll.
C. which
D. /
(2023新疆中考)
6. The students are reading books ____C____ are full of the “red
spirit” these days.
A. who
B. where
C. which
(2023吉林中考)
2021届高三英语二轮复习专题二定语从句(2)(附答案)
2021届高三英语二轮复习专题二定语从句（2）I单句填空1. If a shop has chairs ____________ women can park their men, women will spend more time in the shop.2. Those houses are sold at such a low price ____________ people expected.3. The terrible accident happened on the day ____________ my father left for America, a day ____________ we’ll never forget.4. They were well trained by their masters ____________ had great experience with caring for these animals.5. This city, ____________ lies in the northeast and ____________ I spent my childhood, has been one of the country’s busiest ports since the 1950s.6. There are many occasions ____________ which you are left in a helpless situation, ____________ which you can depend on no one other than yourself.7. The land is known for a historical site with beautifully colored walls, on ____________ are painted the events of the past.8. Peter and his car ____________ disappeared mysteriously in London in 1987 appeared mysteriously in New York in 1993.9. All ____________ happens during early years can influence children for the rest of their lives.10. Irresponsible drivers ____________ like to cut in on the road often make the drivers behind respond by suddenly braking.11. In the morning, two artists, ____________ acting skills were wonderful, came to our school as planned.12. There were sixty-six unprovoked (无端的) shark bite incidents around the world in 2018, only six of ____________ were dangerous, according to the ISAF.13. Still, when you start your journey of positive thinking, you shall meet wonderful new people, with ____________ you can share positive attitudes.14. This famous scientist then remarked that it was at that moment that he knew he didn’t need to be afraid to make mistakes ____________ were actually opportunities for learning something new.15. One of China’s six famous tea types is white tea, ____________ gets its name from its silver-white color.16. In China, a teahouse is a place ____________ people gather to enjoy tea, chat and socialize.17. Power walking uses both upper and lower body strength, ____________ results in stronger muscles and bones.18. Researchers followed a group of people ____________ attended free weekly singing workshops for six months.19. It cannot cover all ____________ Li endured to reach the top of the tennis world.20. In a culture ____________ people function according to ritual, music is used to help govern them.II语法填空AIt is practically inevitable: sometime around the age of 40, people start to need reading glasses. Try (1)____________ they might, there’s no avoiding it. One mobile app creator claims that practicing with their technology can train your eyes to see (2)____________ (well), though some eye doctors are not sure.The reason (3)____________ many people eventually need reading glasses is that the lens (晶状体) of the eye loses flexibility with age, and has trouble focusing on nearby objects. The condition is called presbyopia (老花眼), which is just a natural side effect of aging.The first app (4)____________ (claim) to work out the solution is called GlassesOff. First you take a test given by the app, and then follow its customized training course. Three days a week, for 12-15 minutes, you’ll go through a series of visual exercises, such as recognizing small gray letters on a gray screen. After two or three months, it claims that you can kiss your reading glasses goodbye.“We wanted to develop an application (5)____________ can help people improve their reading ability by improving the way that the brain processes information.” says GlassesOff CEO Nimrod Madar. Until recently it wasn’t possible because scientists did not understand how the image processing (6)____________ (capable) of the brain actually works. “GlassesOff comes up with the idea of neuroplasticity (神经可塑性). Studies have shown that through training new connections can be made in the brain so that it can continue adapting to the world around us. Interms of vision, this means that through training, the brain may be able to form new connections that allow it to clearly process text even when the text (7)____________ (blur) by aging eyes.In a 30-person study published in Scientific Reports in February, some participants were able to read letters 1.6 times smaller after using the app. Adults aged 40 to 60 years old had the most success. The study also found that the users’ eye health improved by (8)____________ average of 8.6 years.Sounds too good to be true? Well, it probably is. “Human vision quality is determined by the physical eye and the way (9)____________ his brain reads the information that the eye captures,” says Rhee, a doctor from Harvard University. “To think that we can reverse (逆转) presbyopia only by neuroplasticity is just not accurate.” It might not make a huge difference in terms of fighting presbyopia, but brain training could make a difference for younger people (10)____________ eyes are still more flexible.BMicroplastics are everywhere in our environment. It's hardly surprising that the tiny fragments have also been found in the human body. A new study shows that Americans are consuming as many as 121,000 particles each year.Measuring 50 to 500 microns in length, microplastics come from a variety of sources, including large plastics (1)____________ break down into smaller and smaller pieces. Therefore, much remains unknown about the common (2)____________ (exist) of these materials within the human body, as well as the impact on human health.Hoping to fill in some of these gaps, a research team, led by Kieran Cox, a Ph. D. candidate at the University of Victoria, looked at 26 papers assessing the number of microplastics in (3)____________ (common) consumed food items, among (4)____________ are seafood, sugar, salt, honey, alcohol and water. The team also evaluated the potential consumption of microplastics through inhalation (吸入) using previously reported data on microplastic concentrations in the air and the Environmental Protection Agency’s data on respiration rates. Based on these data, the researchers calculated that our annual consumption of microplastics via foods and drinks ranges from 39,000 (5)____________ 52,000 particles. When microplastics taken in through inhalation (6)____________ (take) into account, the range jumps to between 74,000 and 121,000 particles per year.The authors of the study found that people (7)____________ drink exclusively from plastic water bottles absorb additional 90,000 microplastics each year, compared with 4,000 among those who only consume tap water. “This shows that small decisions, over the course of a year, really matter and have an impact.” Cox says. The new study, according to its authors, was the first (8)____________ (investigate) “the accumulative human exposure to microplastics”. But in all likelihood, the research tells only a small part of the entire story. Collectively, the foods and drinks (9)____________ the researchers analyzed represent 15 percent of Americans' caloric intake. The team could not account for food groups like fruits, vegetables and grain because there simply is not enough data on their microplastic content.For those (10)____________ worried about microplastic consumption, cutting down bottled water is a good place to start. But for the heart of the problem, we have to stop producing and using so many plastics.III汉译英1. 更重要的是，网上有你可以求助的老师，而且这一切都是免费的。
中考英语二轮复习知识点清单(18)定语从句
（18）定语从句——中考英语知识清单一、定语从句的定义在复合句中，修饰某一名词、代词或某一句子起定语作用的从句叫定语从句。
例：He said he couldn't understand people who talked fat.他说他听不懂那些说话快的人。
I like the books that I can understand.我喜欢我能看懂的书。
上面两句中的people和books是定语从句所修饰的词，叫先行词，定语从句放在先行词的后面。
二、定语从句的关系词引导定语从句的词有关系代词that，which，who（宾格whom，所有格whose）和关系副词where，when，why。
关系代词或关系副词放在先行同和定语从句之间，起连接作用。
同时又作定语从句的一个成分。
1. 关系代词（1）定语从句中关系代词用that不用which的情况①当先行词中既有物又有人的时候。
例：I can't forget the people and the place that I know well.我不能忘记我所熟悉的人和地方。
②当先行词被the last，the very 或the only修饰时。
例：This is the very pen that I am looking for.这正是我正在找的钢笔。
The only book that I want to read is missing.我唯一想看的书不见了。
③当先行词有序数词或最高级修饰时。
例：You are the first person that I want to see.你是我想要见的第一个人。
This is the best book that I can find.这是我能找到的最好的一本书。
④当先行词被all，every，no等修饰时。
例：I want to read all the looks that were written by Lu Xun.我想读所有鲁迅写的书。
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第二讲定语从句一、明备考方向语法填空常考点短文改错常考点写作常用句式1.关系代词who, whom, whose, which, that, as的用法；2.关系副词where, when, why的用法；3.“介词＋关系代词”引导的定语从句。
1.引导非限制性定语从句该用which而误用其他关系词(如that)；2.关系代词who, whom,whose, which, that的缺失；3.关系代词who, whom的错用；4.先行词是人或物时，关系代词who, which的错用；5.关系代词as的错用；6.关系副词和关系代词的误用；7.人称代词与关系代词的误用。
1.As we all know .../As is known to all ...“众所周知……”2.As sb. puts it ...“按照某人所说的……”3.such ...as ...“像……这样的……”4.the same ...as .../the same as ...“像……一样的”5.one of the＋复数名词＋定语从句“……中的一个”6.the only one of the＋复数名词＋定语从句“……中唯一的一个”7.由which引导的非限制性定语从句。
..., which ...(which代替上文整句话，译为“这一点”)二、攻重点难点(一)who, whom, whose引导定语从句的用法1．先行词是人，关系词在定语从句中作主语时，用who/that，关系词不可省略；关系词在定语从句中作宾语时，用whom/who/that，关系词可以省略。
2．先行词those后常用who引导定语从句。
3．“介词＋关系代词”引导的定语从句，如果先行词指人，用whom指代人且不能省略。
4．whose引导定语从句时，作定语，且不能省略。
I've become good friends with several of the students in my school who/whom/that I met in the English speech contest last year.我与好几位去年在英语演讲比赛中遇到的同校同学成了好朋友。
I have many friends to whom I'm going to send post cards.我要寄贺卡给我的很多朋友。
The school shop, w hose customers are mainly students, is closed for the holidays.这家主要顾客是学生的校内商店，放假时关闭。
点津：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。
Tom is the only one of the engineers who h as come up with the solution.汤姆是这些工程师中唯一一个想出解决方法的人。
(二)that, which引导定语从句的用法1．that引导定语从句既可指人又可指物，指人时通常可与who, whom互换，指物时通常可与which互换。
在从句中作主语、宾语或表语，作宾语时可省略。
2．定语从句中用that不用which的情况：(1)当先行词是all, any, anything, everything, nothing等不定代词或被它们修饰时。
(2)当先行词被形容词的最高级或序数词修饰时。
(3)当先行词被the only, the very, the same, the last等修饰时。
(4)当先行词既有人又有物时。
(5)当定语从句出现在which或who的特殊疑问句中时。
(6)有两个定语从句时，其中一个关系代词宜用which，另一个宜用that。
(7)当先行词在主句中作表语，而关系代词在从句中也作表语时。
(8)主句以here, there开头且先行词是指物的名词时。
3．which引导定语从句(1)先行词为物。
(2)which在从句中作主语时不可省略，作宾语时可省略。
4．定语从句中用which而不用that的情况：(1)在非限制性定语从句中，关系代词用which而不用that。
(2)关系代词前面有介词时，用which而不用that。
(3)先行词为that/those时，用which而不用that。
She showed the visitors around the museum that/which was constructed three years ago.她带着这些游客参观了那座三年前建造的博物馆。
The first place that they visited in Guilin was Elephant Trunk Hill.他们在桂林参观的第一个地方是象鼻山。
Who is the man that is sitting on the rock smoking?坐在岩石上抽烟的那个人是谁？The boy was away from home for a week, which worried his parents very much.这个男孩离家一个星期了，这使他父母很担心。
(三)as引导定语从句的用法关系代词as既可以引导限制性定语从句，也可以引导非限制性定语从句，as在从句中作主语、宾语或表语。
1．as引导限制性定语从句时常用于下列句式：(1)such＋名词＋as ...像……这样的，像……之类的the same＋名词＋as ...和……一样的其中关系代词as在从句中作主语、宾语或表语。
(2)...such as ...凡是……的人(或事物)，所有……人(或事物)其意义相当于everything that, all those, those that (who)等。
as引导定语从句并在从句中担当成分，定语从句修饰先行词such。
Take such as you need.你需要什么就拿什么。
You may choose s uch as you prefer.你可挑选自己想要的东西。
2．关系代词as与which引导非限制性定语从句时的区别：as意为“正如，正像”，引导的非限制性定语从句既可在主句前，又可在主句后，有时还可插入主句中；而which意为“这件事，这一点”，引导的非限制性定语从句只能置于主句之后。
相同的是两者都可替代整个主句的内容。
Such machines a s are used in our workshop are made in China.像在我们车间使用的这样的机器是中国制造的。
Tom has made great progress, which makes his parents very happy.汤姆取得了很大进步，这使他父母很高兴。
“There is no such thing as a free lunch，”as the old saying goes.正如老话所说的那样：“天下没有免费的午餐。
”(四)关系副词when, where, why引导定语从句的用法1．when引导定语从句关系副词when指时间，在定语从句中作时间状语。
2．where引导定语从句(1)在定语从句中作地点状语。
(2)先行词可以是表示具体地点的名词(如place, home, school, village, city等)。
(3)先行词也可以是表示抽象意义的名词(如job, life, situation, point, case, stage, activity 等)。
3．why引导定语从句关系副词why指原因，在定语从句中作原因状语，相当于for which。
I'm looking forward to the day when my daughter can read this book and know my feeling for her.我正期盼那一天的到来，那时我女儿可以读这本书，并且了解我对她的感情。
Sing!China has set up a big stage for young people with a talent for music, where some have stood out among them.《中国新歌声》为有音乐天赋的年轻人建立了一个大舞台，在这个舞台上一些人从中脱颖而出。
They have reached the point where they have to separate with each other.他们已经到了必须分手的地步。
Do you know the reason why/for which he didn't attend the meeting?你知道他没参加会议的原因吗？(五)“介词＋关系代词”引导定语从句的用法1．介词和关系代词的确定若介词放在关系代词之前，关系代词指人时常用whom，指物时常用which。
另外，whose 也可以放在介词后，即“介词＋whose＋名词”结构。
一般来说，确定关系代词前的介词，可以从以下三方面入手：(1)先行词的意义；(2)从句中的动词或形容词与先行词的固定搭配；(3)句子的意思。
Trading leather shoes is the business to which the Greens are devoted.皮鞋生意是格林一家所致力于的事业。
(be devoted to “献身，致力于”，固定搭配) Care of the soul is a gradual process in which even the small details of life should be considered.心灵的呵护是一个渐进的过程，在这一过程中，即使是生活中微小的细节也应该考虑在内。
Recently I bought an ancient vase, the price of which(＝whose price) was very reasonable.最近我买了一个古代的花瓶，它的价钱很合理。
2．“of＋关系代词”引导的定语从句在some, any, few, little, none, all, both, neither, many, most, each等代词或数词的前、后表示整体与部分的关系可以用of which/whom。
He had a lot of friends, none of whom would offer help to him when he was in trouble.他有许多朋友，但当他遇到麻烦时没有人会给他提供帮助。