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考研英语语法：学会辨认六类从句说起英语，怎能忽视语法，单词背的再熟练，看完文章还是不懂含义，根源在于语法知识的匮乏。
中英文的语言思维模式并不相同，要想深入的学习考研英语，语法必不可少。
可是语法书那么厚，该怎么学呢?今天我们就来解读考研英语从句。
我们在阅读中，经常能够看到从句的身影，然而种类繁多的从句经常困扰着考生，使考生傻傻分不清眼中的从句究竟属于是哪一类从句，下面就对从句进行简单的剖析，希望对学生们的考研英语复习有所帮助。
►从句类型在英语中，经常使用的从句有以下六类：1.主语从句：一个句子在整个句子中充当主语的成分，该句子被称为主语从句。
2.宾语从句：一个句子在整个句子中充当宾语的成分，该句子被称为宾语从句。
3.表语从句：一个句子在整个句子中充当表语的成分，该句子被称为表语从句。
4.定语从句：一个句子在整个句子中充当定语的成分，该句子被称为定语从句。
5.状语从句：一个句子在整个句子中充当状语的成分，该句子被称为状语从句。
6.同位语从句：一个句子在整个句子中充当同位语的成分，该句子被称为同位语从句。
►从句的辨认如果想辨认从句类型，学生们应该对从句的基本形式有所认识。
无论是哪种从句类型，在句子中充当成分的"句子"应该都具备以下特征：从句=从属连词+句子了解了从句的基本结构，那么应该如何辨别从句类型呢?学生可以在句子中通过简单的公式进行辨认。
常见的从句出现形式有四类：1.名词+从属连词+句子=定语从句/同位语从句2.动词+从属连词+句子=宾语从句/表语从句3.[从属连词+句子=状语从句]+句子4.从属连词+句子+动词=主语从句对于以上四类从句出现形式有了一定的了解，那么今天就首先看看第一类从句出现形式的辨认方法和注意事项吧!1.名词+从属连词+句子=定语从句/同位语从句文都教育教学研究院11例子1： Yet, being friendly is a virtue that many Americans value highly and expect from both neighbors and strangers. (1997 年 Text2)从句类型：定语从句辨别方式： a virtue(名词)+that(从属连词)+many Americans value highly and expect from both neighbors and strangers(句子)译文：然而，表示友好是一种美德，美国人高度重视这种美德，并期望邻居和陌生人都能有这种美德。
2020高考英语语法复习：状语从句高考英语频道为大家提供2019高考英语语法复习：状语从句，一起来复习一下吧！更多高考资讯请关注我们网站的更新!2019高考英语语法复习：状语从句一、时间状语从句1、when的用法(1)when既可引导一个持续性动作，也可引导一个短暂性动作，可用于表示主句和从句动作同时发生或从句动作先于主句动作，有时还可表示从句动作后于主句，意为“当...时候”。
(2)when在beabouttodo...when...，bedoing...when...，haddone...when...，beonone’sway...when...，beonthepointofdoing...when...等结构中，作“那时突然”讲。
(3)when“既然、鉴于;尽管，虽然(位于主句之后);如果”2、while的用法(1)表示“当...时候”，引导的动作必须是延续性的。
(2)用作并列连词，表示相对关系“然而”。
(3)引导让步状语从句，相当于although,意为“虽然”，位于主句前。
(4)引导条件状语从句，相当于as/solongas，意为“只要”。
3、as的用法(1)表示“当...时候”，强调同时发生，不指先后。
(2)说明两种正在发展或变化的情况，表示“随着”，表示时间的推移。
(3)表示“一边...一边...”。
(4)强调两个动作紧接着发生。
(5)表示“虽然，尽管”。
(6)其他含义“正如，正像”，“作为”，“由于，因为”。
4、before的用法(1)一般意为“在...之前”“...才”，“...就”“还没有...”“免得”“不知不觉”“宁可，宁愿”，“否则，要不然”。
(2)It+willbe/was+时间段+before+一般现在时/一般过去时。
在肯定句中，意为“多长时间之后才”;在否定句中，意为“用不了多长时间就”。
5、until和till(1)与肯定句连用，必须是延续性动词。
(2)与否定句连用，必须是非延续性动词，表示“直到...才，在...之前不...”。
状语从句归纳复习一、时间状语从句.1. when, while, as引导的时间状语从句when从句的动作和主句的动作可以同时发生,也可不同时发生。
可以指时间点,也可指一段时间。
as指时间点时相当于when, 也可意为“一边...一边…”,“随着…”while表示从句的动作和主句的动作同时发生,强调一段时间。
1）_____________________________________, I will call you. 他明天来的时候2）Henry is in charge of the office____________________________________(Mr Smith不在的时候).3）He picked up some French________________________________________(在法国的时).4）____________________________________________(正走) in the street, he met Tim.5）____________________________________, the girls were singing happily. 一边采茶一边唱歌6）People’s living standard has been improved__________________________________________(随着科技的发展). 注意：(1) when还可作并列连词, 意为“正在这时”。
7) We were talking about him_______________________________________________(这时他进来了).8) _____________________________________________________(我正要离开)when the telephone rang.9) We had just walked a mile____________________________________________(这时就累了).(2) when还表示原因, 意为“既然”.10) It was foolish of you to take a taxi __________ you could easily walk there in five minutes.(3)while可作并列连词，意为“而”11) He likes pop music_____________________________________________. 而我喜欢古典音乐(4) when , while 可用于状语从句的省略，即当从句中的主语与主句的主语相同且谓语部分含有be，这时从句中的主语和be可以省略。
Unit4----unit6语法复习Adverbial Clause（状语从句）1状语从句的种类用来修饰谓语动词、其它动词、定语、状语或整个句子的从句叫做状语从句。
状语从句可分为： 1.时间状语从句；(adverbial clause of time) 2.地点状语从句；(adverbial clause of place) 3.原因状语从句；(adverbial clause of cause) 4.条件状语从句；(adverbial clause of condition) 5.目的状语从句；(adverbial clause of purpose) 6.让步状语从句；(adverbial clause of concession) 7.比较状语从句；(adverbial clause of comparison) 8.程度状语从句；(adverbial clause of degree) 9.方式状语从句；(adverbial clause of manner) 10.结果状语从句。
(adverbial clause of result) 2状语从句的时态特点一般情况下，时间和条件状语从句的谓语动词一般用“一般现在时”表示“一般将来时”，用“现在完成时”表示“将来完成时”。
例如： I will call you as soon as I arrive in Beijing. 我一到北京就给你打电话。
（这是由as soon as引导的时间状语从句，从句中的谓语动词arrive 是一般现在时，表示一般将来时，决不可用will arrive） As soon as I have finished this work, I will go home. 我一完成此工作，就回家。
（从句中的谓语动词用现在完成时have finished，表示将来完成时,决不可用will have finished） If he comes back, please let me know.如果他回来了，请通知我。
语法复习六：状语从句由从句担任的状语，在句子中可修饰谓语（或其它动词）、形容词、副词或是整个句子，它可以用来表示时间、地点、原因、目的、结果、条件、方式、比较、让步等。
状语从句是一较大的语法项目，也是近几年高考题中常见的一个重要试点。
高考中已考查了时间、让步、地点、条件、目的等状语从句，这些从句仍是今后高考热点，应作充分准备。
同时对方式状语从句也应引起重视。
（一）时间状语从句表示时间的状语从句可由when, as, while, whenever, after, before, till (until), since, once, as soon as (或the moment ), by the time, no sooner … than, hardly (scarcely) … when, every time等引导。
e.g. When I came into the office, the teachers were having a meeting.He started as soon as he received the news.Once you see him, you will never forget him.No sooner had I gone to bed than I went to sleep.（二）原因状语从句原因状语从句是表示原因或理由的，引导这类从句的最常用的连词是because, since, as , now that（既然）等，for 表示因果关系时（它引导的不是从句）为并列连词，语气不如because 强。
e.g. He is disappointed because he didn't get the position.As it is raining, I will not go out.Now that you mention it, I do remember.（三）地点状语从句引导地点状语从句的连词是where 和wherever等。
状语从句一、考点解读今天我们复习状语从句，英语中状语与中文的状语大致相同，分为时间状语、地点状语、原因状语、目的状语、结果状语、条件状语、方式状语等等。
如果一个主从复合句中的从句是用来表示时间，原因等等时，那就称为状语从句。
在主从复合句中修饰主句中的动词、形容词、副词等的从句叫做状语从句，又由于其功能与副词非常相近，又称做副词性从句。
状语从句一般可分为时间状语从句、地点状语从句、原因状语从句、目的状语从句、结果状语从句、条件状语从句、让步状语从句、比较状语从句和方式状语从句九种。
这节课我们主要复习如下的内容：1．时间状语从句2．地点状语从句3．原因状语从句4．目的状语从句5．结果状语从句6．条件状语从句7．让步状语从句8．比较状语从句9．方式状语从句二、专题梳理（一）时间状语从句在句子中起时间状语作用的句子称为时间状语从句。
时间状语从句可以放在句首、句中和句尾。
常用来引导时间状语从句的引导词有：when 当……时候while 当……时候as 当……时候、一边after 在……之后before 在……之前since 自从ever since 自从once 一……就……whenever 不管什么时候by the time 到……as long as 长达……as soon as 一……就……till/until 直到……1．when，while，as的用法从属连词when，while，as都可用来引导时间状语从句，意为“在……时候”。
但在具体用法上又不尽相同。
（1）这三个连词中，when用得最广，常可代替while与as。
与while相比，when引导的从句动词既可是延续性的，也可是终止性的。
as在这一点上与when相同，while所引导的从句中，动词只能是延续性的。
在初中阶段，我们几乎很少讲as引导时间状语从句。
是因为as在初中阶段是一种供了解性的内容。
e.g.When the fire broke out, all the studentswere sleeping soundly.（终止性的）当火灾发生时，所有的学生正在熟睡中。
语法复习六：状语从句由从句担任的状语，在句子中可修饰谓语（或其它动词）、形容词、副词或是整个句子，它可以用来表示时间、地点、原因、目的、结果、条件、方式、比较、让步等。
状语从句是一较大的语法项目，也是近几年高考题中常见的一个重要试点。
高考中已考查了时间、让步、地点、条件、目的等状语从句，这些从句仍是今后高考热点，应作充分准备。
同时对方式状语从句也应引起重视。
（一）时间状语从句表示时间的状语从句可由when, as, while, whenever, after, before, till (until), since, once, as soon as (或the moment ), by the time, no sooner … than, hardly (scarcely) … when, every time等引导。
e.g. When I came into the office, the teachers were having a meeting.He started as soon as he received the news.Once you see him, you will never forget him.No sooner had I gone to bed than I went to sleep.（二）原因状语从句原因状语从句是表示原因或理由的，引导这类从句的最常用的连词是because, since, as , now that（既然）等，for 表示因果关系时（它引导的不是从句）为并列连词，语气不如because强。
e.g. He is disappointed because he didn't get the position.As it is raining, I will not go out.Now that you mention it, I do remember.（三）地点状语从句引导地点状语从句的连词是where 和wherever等。
e.g. Sit wherever you like.Make a mark where you have a question.（四）目的状语从句引导目的状语从句最常用的词（组）是so, so that（从句谓语常有情态动词）, in order that, in case（以防，以免）等。
e.g. Speak clearly, so that they may understand you.She has bought the book in order that she could follow the TV lessons.He left early in case he should miss the train.（五）结果状语从句结果状语从句是表示事态结果的从句，通常主句是原因，从句是结果。
由so that （从句谓语一般没有情态动词）, so … that, such … that等引导。
e.g. She was ill, so that she didn’t attend the meeting.He was so excited that he could not say a word.She is such a good teacher that everyone admires her.（六）条件状语从句条件状语从句分真实性（有可能实现的事情）与非真实性（条件与事实相反或者在说话者看来不大可能实现的事情）条件句。
引导条件状语从句的词（组）主要有if, unless, so (as) long as, on condition that, so (as) far as, if only ( = if )。
注意：条件从句中的if 不能用whether替换。
e.g. If he is not in the office, he must be out for lunch.You may borrow the book so long as you keep it clean.So far as I know（据我所知）, he will be away for three months.You can go swimming on condition that ( = if ) you don’t go too far away from the river bank.If he had come a few minutes earlier, he could have seen her.（七）让步状语从句让步状语从句可由although, though, as, even if (though), however, whatever, whether … or, no matter who (when, what, …)等引导。
注意：as引导的让步状语从句一般是倒装的。
e.g. Though he is a child, he knows a lot.Child as he is, he knows a lot.Whatever ( = No matter what ) you say, I’ll never change my mind.（八）方式状语从句方式状语从句常由as, as if (though), the way, rather than等引导。
e.g. You must do the exercise as I show you.He acted as if nothing had happened.（九）比较状语从句比较状语从句常用than, so (as) … as, the more … the more等引导。
e.g. I have made a lot more mistakes than you have.He smokes cigarettes as expensive as he can afford.The busier he is, the happier he feels.（十）使用状语从句时要注意的几个问题1、在时间和条件（有时也在方式、让步等）从句中，主句是一般将来时，从句通常用一般现在时表示将来。
e.g. We’ll go outing if it doesn’t rain tomorrow.I’ll write to you as soon as I get to Shangh ai.2、有些时间、地点、条件、方式或让步从句，如果从句的主语与主句主语一致（或虽不一致，是it），从句的谓语又包含动词be ，就可省略从句中的“主语+ be”部分。
e.g. When (he was) still a boy of ten, he had to work day and night.If (you are) asked you may come in.If (it is) necessary I’ll explain to you again.3、注意区分不同从句：引导的是什么从句，不仅要根据连词，还要根据句子结构和句意来判别。
以where为例，能引导多种从句。
e.g. You are to find it where you left it.（地点状语从句）Tell me the address where he lives.（定语从句，句中有先行词）I don’t know where he came from.（宾语从句）Where he has gone is not known yet.（主语从句）This place is where they once hid.（表语从句）练习、状语从句一、用横线划出下列句子中的状语从句，并指出是哪种状语从句：1. Child as she is, she knows a lot of things.2. The more I can do for the class, the happier I’ll be.3. He talks as if (as though) he knew all about it.4. He is such a good teacher that the students love and respect him.5.I shall go to the park unless it rains.6. No sooner had I got home than it began to rain.7. Where there is water, there is life.8. He studied hard so that he could catch up with his classmates.9. Since you are very busy, I won't trouble you.10. Even if (though) I fail. I’ll never lose heart.11. Once you begin the work, you must continue.12. I will find her wherever she may be.13. Now that you've come, you'd better have dinner with us.14. He was so excited that he couldn't fall asleep.15. We must do everything as he tells us.16. India is much bigger than Japan.17. No matter when you come, you are warmly welcome.18. As (So) long as you work hard, you can catch up with the other classmates.二、用适当的连词填空：1. Dr. Bethune (白求恩) came to China __________ he was fifty.2. He began to work __________ he got there.3. Let's begin our meeting __________everyone is here.4. I like the English people, __________ I don't like their food.5. __________ you go in China, you can see smiling faces.6. He didn't come to the lecture, __________ he was very busy.7. __________we had enough time, we walked to the cinema.8. They will help you __________ you meet with difficulty.9. _________ we came to the university, we have learnt quite a lot.10.I didn't join them yesterday evening __________ I had to go to an important meeting.11. We would try to get a car __________we could all travel together more easily.12. She wouldn't forget her mother's birthday __________ she seldom wrote to her family.13. We're doing everything we can to make things as easy for you ___________we can.14. The meeting became so disorderly __________ the speaker had to shout the audience down.15. He was angrier __________ ever before.16. __________ you lock all the doors, he can still manage to get in.17. The boy was so tired __________ he fell asleep on the bus.18. Hard _________ he tried, he couldn’t force the door open.三、选择填空：1. I’ll let you know ____ he comes back.A. beforeB. becauseC. as soon asD. although2. She will sing a song ____ she is asked.A. ifB. unlessC. forD. since3. We will work ____ we are needed.A. wheneverB. becauseC. sinceD. wherever4. Read it aloud _____ the class can hear you.A. so thatB. ifC. whenD. although5._____ you go, don't forget your people.A. WheneverB. HoweverC. WhereverD. Whichever6. It is about ten years _____ I met you last.A. sinceB. forC. whenD. as7. They will never succeed, _____ hard they try.A. becauseB. howeverC. whenD. since8. _____ still half drunk, he made his way home.A. WhenB. BecauseC. ThoughD. As9. _____ she was very tired, she went on working.A. AsB. AlthoughC. EvenD. In spite of10. Busy _____ he was, he tried his best to help you.A. asB. whenC. sinceD. for11. I learned a little Russian _____ I was at middle school.A. thoughB. althoughC. as ifD. when12. _____ we got to the station, the train had left already.A. IfB. UnlessC. SinceD. When13. _____ the rain stops, we' 11 set off for the station.A. BeforeB. UnlessC. As soon asD. Though14. She was _____ tired _____ she could not move an inch.A. so, thatB. such, thatC. very, thatD. so, as15. We didn’t go home _____ we finished the work.A. sinceB. untilC. becauseD. though16. I'll stay here _____ everyone else comes back.A. even ifB. as thoughC. becauseD. until17. Although it's raining, _____ are still working in the field.A. theyB. but theyC. and theyD. so they18. Speak to him slowly _____ he may understand you better.A. sinceB. so thatC. forD. because19. You'll miss the train ______ you hurry up.A. unlessB. asC. ifD. until20. When you read the book, you' d better make a mark _____ you have any questions.A. at whichB. at whereC. the placeD. where21. We'd better hurry ______ it is getting dark.A. andB. butC. asD. unless22. I didn' t manage to do it _____ you had explained how.A. untilB. unlessC. whenD. before23._____ he comes, we won't be able to go.A. WithoutB. UnlessC. ExceptD. Even24. I hurried _____ I wouldn't be late for class.A. sinceB. so thatC. as ifD. unless25. _____ I catch a cold, I have pain in my back.A. Every timeB. ThoughC. EvenD. Where26. What's the matter _____ they still haven't answered the telegram?A. whenB. thatC. thoughD. however27. Bring it nearer _____ I may see it better.A. althoughB. even thoughC. so thatD. since28. You may arrive in Beijing early _____ you mind taking the night train.A. thatB. thoughC. unlessD. if29. Helen listened carefully _____ she might discover exactly what she needed.A. in thatB. in order thatC. in caseD. even though30. More people will eat out in restaurants _____ they do today.A. thanB. whenC. whileD. as31._____ hard she tries, she can hardly avoid making mistakes in her homework.A. MuchB. HoweverC. AsD. Although32. Poor _____ it may be, there is no place like home, _____ you may go.A. as; whereverB. though; wheneverC. in spite of; whenD. that; wherever33. The child was __ immediately after supper.A. enough tired to go to bedB. too tired to go to bedC. so tired that he went to bedD. very tired, he went to bed34. The history of nursing __ the history of man.A. as old asB. is old thanC. that is as old asD. is as old as35. _____ born in Chicago, the author was famous for his stories about New York.A. SinceB. OnceC. WhenD. Although36._____ we stood at the top of the building, the people below were hardly visible.A. AsB. AlthoughC. UnlessD. In spite of37. Scarcely was George Washington in his teens _____ his father died.A. thanB. asC. whileD. when38. _____ David goes, he is welcome.A. WhicheverB. HoweverC. WhereverD. Whatever39. The house stood _____ there had been a rock.A. whichB. at whichC. whenD. where40. Small _____ it is, the pen is a most useful tool.A. becauseB. soC. ifD. as41. After the new technique was introduced, the factory produced _____ tractors in 1988 as the year before.A. as twice manyB. as many twiceC. twice as manyD. twice many as42. The piano in the other shop will be _____, but _____.A. cheaper; not as betterB. more cheap; not as betterC. cheaper; not as goodD. more cheap; not as good43. John plays football _____, if not better than, David.A. as wellB. as well asC. so wellD. so well as44. Although he is considered a great writer,A. his works are not widely readB. but his works are not widely readC. however his works are not widely readD. still his works are not widely read45. ___ the day went on, the weather got worse.A. WithB. SinceC. WhileD. As46.—What was the party like?—Wonderful. It' s years _____ I enjoyed myself so much.A. afterB. whenC. beforeD. since47. It was not _____ she took off her dark glasses _____ I realized she was a famous film star.A. when; thatB. until; thatC. until; whenD. when; then48. If we work with a strong will, we can overcome any difficulty, _____ great it is.A. whatB. howC. howeverD. whatever49. After the war, a new school building was put up _____ there had once been a theatre.A. thatB. whereC. whichD. when50._____, Mother will wait for him to have dinner together.A. However late is heB. However he is lateC. However is he lateD. However late he is51. He will come to call on you the moment he ____ his painting.A. will finishB. finishedC. has finishedD. had finished52. ____ difficult the task may be, we will try our best to complete it in time.A. No matterB. No wonderC. ThoughD. However53. It was ____ that she couldn’t finish it by herself.A. so difficult a workB. such a difficult workC. so difficult workD. such difficult work。
