状语从句详细讲解

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内容提示： 状语从句状语从句时间状语从句地点状语从句原因状语从句的状目的状语从句结果状语从句条件状语从句方式状语从句让步状语从句比较状语从句从句 1 .时间状语从句1)由连词when, while, as, as soon as, before, after, since, till/ until等引导。�6�1 主句用将来时， 从句常用一般现在时表将来I will tell him when he comes back. 2)while, when, as辨析While引导的时间状语从句只指一段时间，强调某一段时间内， 主从句动作同时发生。 从句动词常是延续性的When既可以指一个时间点,也可以是一段既可以指个时间点,也可以是时间， 可表示主从句的动作同时或先后...
状语从句状语从句时间状语从句地点状语从句原因状语从句的状目的状语从句结果状语从句条件状语从句方式状语从句让步状语从句比较状语从句从句 1 .时间状语从句1)由连词when, while, as, as soon as, before, after, since, till/ until等引导。• 主句用将来时， 从句常用一般现在时表将来I will tell him when he comes back. 2)while, when, as辨析While引导的时间状语从句只指一段时间，强调某一段时间内， 主从句动作同时发生。 从句动词常是延续性的When既可以指一个时间点,也可以是一段既可以指个时间点,也可以是时间， 可表示主从句的动作同时或先后发生。 从句动词可以是延续性的， 也可以是非延续性的。As强调主句、 从句动作相并发生,译为” 一边…一边…”段 When he returned , his wife was cooking.While he was reading, his wife was cooking.He hurried home, looking behind as he went . 对比训练 1____ he heard this, he got very angry. 2. I met Lucy____ I was walking along the river.3. ____ a child, he lived in the countrysidecountryside.A. when B. while C. as 另外, when/while还作并列连词,连接并列分句,while表示 “而,可是” 如:I like reading while my wife enjoys watching TV.when表示 “就在这时” 在下列结构中， 表示某件事正在发生或刚刚发生， 另一动作同时发生。1.be about to do… when…2.be doing… when…3.had done… when…e.g. We were about to start when it began to rain.I was playing computer games when mom came in. while的用法小结 ：①While I was walking down the street, Icame across an old friend. ( while=_______)②He likes pop music, while I am fond offolk music. ( whilefolk music. ( while③While I really don’t like art, I find hiswork impressive. (while=___________)whenwhenbutbutalthoughalthough We were about to leave____ it began to rain.2. She thought I was talking about her son, ____, in fact, I was talking about my son.3. Hardly had I finished my composition ____ the bell rang.A. when B. while C. as D. during 3)until/till(不用于句首)“延续的动词（肯定式） +until ”表示“直到…为止”I waited for him until he came back.“非延续性动词（否定式） +until ”表示“直到才”“直到┅才”He didn’t go to bed until he finished his work.注意: not until 在句首时要倒装Not until he saw it himself did he believe it. 4)表示“一…就…”的句型(1)as soon as, once, the moment/ minute/ second, immediately/ directly/ instantlyAs soon as he comes, I’ll tell him.The moment I saw him, I recognized him.I l ft idi t l thI left immediately the clock struck 5.(2)on / upon doing / on (upon) one’s +nOn arriving at the station, the thief was arrested.On his arrival in Paris, he was recognized as a famous person.lk tk 5 (3)no sooner… than/ hardly… when / scarcely… whenNo sooner had they reached home than it started to rain.Hardly had I entered the room when the telephone rangtelephone rang. 5)Every time, each time等也可以引导时间状语从句Every time I caught a cold , I had pain in my head. 连接词before的小结：1. We had sailed four days and four nights before we saw land.2. We hadn’t run a mile before he felt tired.4. Before I could get in a word, he had measured me.“……“……才”才”“ “不到不到…………就”就”“ “还没来得及”还没来得及”It will be a long time It will be a long time beforeIt won’t be long It won’t be long beforeIt is / has been two years It is / has been two years sincesthsth. .before………before…since sbsb did did 1 1） 句型） 句型It will be/wasIt will be/was＋段时间＋“ “还要过多久才还要过多久才……” 如：如： It will be two years It will be two years before the country.the country.2 2） 句型） 句型It will be/was notIt will be/was not＋一段时间＋“ “不多久就不多久就……”……”如：如：It wasn’t two years It wasn’t two years beforecountry.country.＋段时间＋before………” before he leaves before…he leaves ＋一段时间＋before…before…before he left the he left the y y 一、 若since引导的状语从句的谓语动词是终止性的过去时， 则从句表示的时间是“从动作开始的那一时刻起” 。 如：He has studied very hard since he came to our school.自从他来到我们学校自从他来到我们学校， 他学习就非常努力。We have been missing them since they left here自从他们离开这里， 我们就一直很想念他们。他学习就非常 二、 若since引导的状语从句的谓语动词是持续性动词或表示状态的动词的过去时时， 则从句表示的时间是“从那持续动作或状态结束时算起” 。 如：I haven’t heard any noise since I slept. Sleep 为持续性动词， sleep的动作结束时，即“醒来” 时， 这句应译为“我醒后还未听到任何声音” 。John is now with his parents in New York, it is already three years since he was a teacher约翰现在和父母一起住在纽约， 他不当教师已经三年了。 How long is it since you lived in Shanghai?你离开（没住在） 上海多久了 延续性； 不… 多长时间了It is half a month since he was a League member.他退团（不当团员） 半个月了。It’s been quite some time since I was last in London我离开伦敦已很长时间了。比较比较： He has written to me frequently since I was ill.自从我病愈以来， 他屡次给我写信。（从句谓语为状态动词）He has written to me frequently since I fell ill.自从我生病以来， 他就屡次给我写信。（从句谓语为终止性动词） ’ll let you know ____ he comes back.A. before B. becauseC. as soon asD. althoughIt is about ten years _____ I met you last.A.since B. forB.C. whenD. asB.C. when D. as____ we got to the station, the train had left already.A.If B. UnlessC. Since D. When We didn’t go home _____ we finished the work.A. since B. until C. because D. thoughIt was not ______ she took off her dark glasses ______ I realized she was a ffiltAfamous film star. A. when; that B. until; that C. until; when D. when; thenhth tB. He was about halfway through his meal ______ a familiar voice came to his ears. A. why B. where C. when D. while Scientists say it may be five or six years ______ it is possible to test this medicine on human patients. A. since B. after C. before D. whe　Why didn’t you tell him about the meeting? 　He rushed out of the room____I could say a word. A. before B. until C. when D. after _____ I accept that he is not perfect, I do actually like the person. A. While B. Since C. Before D. Unless　Did you remember to give Mary the money you owed her?money you owed her? 　Yes. I gave it to her ______ I saw her. A. while B. the moment C. suddenly D. once 2. 让步状语从句引导词有：although, though, even if/though, as , while（尽管） whether…or…( 无论…还是… ),whoever= no matter whowhoever= no matter who whenever= no matter whenwhatever= no matter whatwherever= no matter wherehowever= no matter how 1)as 引导的让步从句要倒装， 句型为：形容词/ 副词/ 名词（不带冠词） / 动词（原形） +主语+谓语Young as he is, he knows a lot.Much as I like it, I can’t afford it.Farmer as he is he is well-educatedFarmer as he is, he is well-educated.Try as I might, I couldn’t lift the stone.2） although不倒装，不倒装, as 必须倒装though可倒装也可Although/Though he was ill he didn’t stop working. 3） no matter +疑问句引导让步状语从句No matter what happened, he shouldn’t mind.=Whatever happened, he shouldn’t mind.No matter who you are, you should obey the social rules.=Whoever you are, you should …oe e you a e, you s ou d4) whether …orWhether you believe it or not, it is true.whether… or…不管…还是…a. Whether the weather is good or bad, they will set off as they planned. B.Whether he drives or takes the train, he will be here on time. 1 、difficult it was. A. however B. no matter C. whatever D although 2、 The old tower must be saved, ______the cost. A． however B． whatever C． whichever D． wherever 对比训练 3 1 . Child ____ she is, she know a lot.2. He did the experiment ____ he was told.3. The pianos in the other shop will be cheaper, but not ____ good.A. during B. as C. so D. thoughE. both B and CHe tried his best to solve the problem, ___ 3. 地点状语从句引导词有: where, whereverI’ll follow you wherever you go.Where there is a will , there is a way.注意： 不要混同于where 引导的定语从句注意： 不要混同于where 引导的定语从句(有志者， 事竟成）与定语从句的区别： where引导定语从句，从句前有一个表示地点的名词。Go back where you came from.Go back to the village where you came from. When you read the book ,you 'd better make a mark ___ you have any question. A at which B at where C the place where D whereWhen you read the book ,you 'd better ymake a mark at the place _____ you have any question.A which B at whereC the place where D wherey 4. 原因状语从句由because, since, now that, as引导。(1). because 语气最强， 用来回答why提问，可用在强调句型中,引导的从句表示直接的、根本的原yin It was because he was ill that he didn’t go with us.(2).Since语气比because弱， 表示关系上的自然结果， 一般译成“既然， 鉴于” （往往放于主句之前） 表示显然的或已知的原表示显然的或已知的原因因..Since no one is against it ,let’s carry out the plan.（既然没人反对, …) (3).as语气最弱， 只说明一般的因果关系（可放于主句之前， 也可放于主句之后）Wear strong shoes as we shall do a lot of walking today.与与sincesince没多大区别(4).for也可以表示原因， 不是说明直接原因， 而是对某种情况加以推倒， 用于表示补充说明理由补充说明理由。He must be ill, for he is absent today.(5).now that用来说明一种新情况， 然后加以推理， now that放于句首时， that可省略。Now ( that) everybody is here, let’s begin.没多大区别 ______ the day went on, the weather got worse.A With B Since C While D AsA. With B. Since C. While D. AsHe took off his coat _______ he felt hot.A. because B. as C. if D. since 5. 目的状语从句引导词： in order that, so that(为了 ） ,for fear that , in case,谓语动词常含有can, could, may, might, will, would等情态动词。I’ll speak slowly so that everybody can understand me.He wrote the name down for fear that( in case) he would forget. in casein case与与for fear thatfor fear thatI will have to stay at home this evening I will have to stay at home this evening ______________ my teacher comes.______________ my teacher comes.in casein casebecause of the possibility of because of the possibility of sthsth happeninghappeningStudents of Class 13 are working hard Students of Class 13 are working hard theses days _________________ they theses days _________________ they might fail the exam.might fail the exam.for fear thatfor fear thatto avoid the danger of to avoid the danger of sthsth happeninghappening Ann listened carefully _____ she could discover what she needed.A. such thatB. in order thatC. becauseD. even though11 . I hurried ____ I wouldn’t be late for class.AiBA. sinceB. so thatC. as ifD. unlessth t 6. 结果状语从句：引导词有： so…that, such…that, so that常用句型：1)so+ adj. (adv.) + that2)so+ adj + a (an) + n +that2)so+ adj. + a (an) + n. +that3)Such +a (an) +adj. + n. + that4)Such +adj. + n (s) +thatHe spoke so fast that I couldn’t follow him.It was such a good day that we all went swimming. He left in ___a hurry ___he forgot to lock the door.A. such, that B. so, that B.C. such, as D. so, when.Farmers rotate (轮作) their crops _____ the soil will remain fertile.A. so that B. because of C. in order to D. rather thanIt was ____ a hundred people looked lost in it.A. so large a room that B. so large roomC. a such large room D. such large a roomHe has ____ little education that he can’t teach ____ little children. A. so; such B. too; such C. a; so D. very; so 7. 条件状语从句1. 由if, unless(= if not), so/ as long as(只要), suppose/supposing(假设，如果), in case(以防), on condition that, only if , if only引导。e g You may use the room as long as youe.g. You may use the room as long as you clean it up afterwards.2.“祈使句+and/ or/ or else/otherwise”引导的结果句， 祈使句在实际意义上相当于条件状语从句。Use you head, and you will find a way.Get up now, or you will be late. 1 、 The WTO cannot live up to its name ____ it does not include a country that is home to one fifth of mankind. A． as long as B． while2、It is known to all that _____ you exercise regularly, you won’t keep good health. A. unless B. whenever C. although D. if unless 相当于 if not， 意思是“除非…”“如果不…就…”。 这也是高考的热点之一。 复习时也应给予高度重视。1 、 _____ I can see, there is only one possible way to keep away from the danger. A. As long as B. As far as C. Just as D. Even if 2、 I always take something to read when I go to the doctor’s ________ I have to wait. A． in caseB． so that C． in order D． as if C． if D． even though 8. 方式状语从句引导词有: as(如同 ), as if/though (好像)They are talking as if (as though) they were old friends.注意：注意：as， like 都表示“像” ，as 是连词 ， 后加句子like 是介词， 后加名词、 代词、 名词短语I work as others do .I work like others. 9.比较状语从句由as… as, not as/ so…as, than, the more… the moreHe ran as far as he could.The harder you try, the better you will understand. 四. 状语从句的时态问题问题1：1、 The house could fall down soon if no one______ some quick repair work. A has doneB is doingdone 2、 It is almost five years _______ we saw each other last time. A. before B. since C. after D. when 在条件， 时间和让步从句中， 用一般现在时表示一般将来时， 用现在完成时表将来完成时， 用一般过去时表过去将来时。 在 since 引导的时间状语从句中， 动词一般都用一般过去时， 而主句常用现在完成时。C doesD had 五、 状语从句的倒装问题问题1：1、 So difficult _____ it to live in an English-speaking country that I determined to learn English. A. I have felt B. have I felt C. I did feel D. did I feel2、 Not until all the fish died in the river _____ how serious the pollution was. A. did the villagers realize B. the villagers realizedC. the villagers did realize D. didn’t the villagers realize 状语从句的倒装一般有下面几种情况： ① 否定词开头； ② so 加 adj. 开头； ③ as / though引导的让步状语从句。Hardly had he got to the station when the train left.No sooner had he got to the station than the train left.Child as he is, he can speak seven foreign languages.

状语从句.概念

状语从句修饰主句中的动词,形容词,副词等,在复合句中作状语.引导状语从句的关联词是从属连词.状语从句用陈述句语序,一般位于复合句的句首或句末.当从句在句首时,从句后常用逗号和主句相隔.状语是句子谓语动词的重要组成部分。它的主要语法功能是说明谓语动词，在时间、地点、方式、原因、结果，条件等方面对谓语动词作细节上的描述这些状语经常由副词、短语和从句表示。起状语作用的从句就是状语从句。

状语从句可分为：1时间 2地点 3目的 4原因 5结果 6方式 7条件 8让步 9比较九个种类。

考点分析：

1. 状语从句虽然有完整的主谓结构，却是不能独立的从句。

2. 状语从句它由从属连词引导成为整个句子一个不可缺少的部分。

3. 考查的热点有条件、时间、地点、让步等状语从句的连接词词义辨析.

4. 动词的时态呼应、状语从句的省略等。

5. 题干结构呈交叉和综合特征，选项设计多从定语从句和名词性从句的角度进行思维干扰。

引导状语从句的连接词列表

状 语 从 句连 接 词时间状语从句常用引导词：when, as, while, as soon as(一……就……), while, before, after, since , till, until。 特殊引导词：the minute, the moment, the second, the day，the instant, immediately , directly, no sooner … than, hardly …when, barely \ scarcely … when(一……就……)，each time, the first（第一次）, last time。every time（每次）,地点状语从句常用引导词：where。 特殊引导词：wherever, anywhere, everywhere原因状语从句常用引导词：because, since, as, since。特殊引导词：seeing that, now that, in that, considering that, given that, considering that, in as much as,条件状语从句常用引导词：if, unless,。 特殊引导词：as/so long as, only if, provid

一 状语从句的种类

§ 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2.地点状语从句；3.原因状语从句；4.条件状语从句；5.目的状语从句；6.让步状语从句；7.比较状语从句；8.程度状语从句；9.方式状语从句；10.结果状语从句。

§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”。

二 时间状语从句

§3时间状语从句（adverbial clause of time）

1.由when, while, as引导的时间状语从句。

【区别】when, while和as的区别：when引导的从句的谓语动词可以是延续性的动词，又可以是瞬时动词。并且when有时表示“就在那时”。

While引导的从句的谓语动作必须是延续性的，并强调主句和从句的动作同时发生（或者相对应）。并且while有时还可以表示对比。例如：

While my wife was reading the newspaper, I was watching TV. (was reading是延续性的动词，was reading和was watching同时发生)

As表示“一边……一边”，as引导的动作是延续性的动作，一般用于主句和从句动作同时发生；as也可以强调“一先一后。
As we was going out, it began to snow.当我们出门时，开始下雪了。（as强调句中两个动作紧接着先后发生，而不强调开始下雪的特定时间）

2.由before和after引导的时间状语从句。注意before引导的从句不再用否定式的谓语，并且当before引导的从句位于主句之后，有时译成“就，才”。还要注意主句和从句之间的时间关系。当主句用将来时，从句总是用现在时；如果before引导的从句谓语用的是过去时，则主句动词多用过去完成时，这样以便体现动作发生的先后。After表示主句动作发生在从句动作之后。主句和从句的动作的时间关系正好与before引导的从句相反。
3.由till或until引导的时间状语从句。till和until一般情况下两者可以互换，但是在强调句型中多用until。并且要注意的是：如果主句中的谓语动词是瞬时动词时，必须用否定形式；如果主句中的谓语动词是延续性动词时，用肯定或否定形式都可以，但表达的意思不同。例如：

4.由since引导的时间状语从句。 since引导的从句的谓语动词可以是延续性的动词，又可以是瞬时动词。一般情况下，从句谓语动词用一般过去时，而主句的谓语动词用现在完成时。但在It is ＋时间＋since从句的句型中，主句多用一般现在时。例如：

5.由as soon as, immediately, directly, instantly, the moment, the instant, the minute, 等引导的时间状语从句。这些连词都表示“一……就”。

【注意】hardly(scarcely, rarely)…when / before, no sooner…than相当于as soon as之意。主句用过去完成时，从句用一般过去时。当hardly, scarcely, rarely和no sooner位于句首时，主句应用倒装语序。
6.由by the time引导的时间状语从句。注意时态的变化：在一般情况下，如果从句的谓语动词用一般过去时，主句的谓语动词用过去完成时；如果主句的谓语动词用一般现在时，主句的谓语动词用将来完成时。
7.由each time, every time和whenever引导的时间状语从句。
8.由as long as和so long as引导的时间状语从句。这两个连词表示“有多久……就多久”。

三 地点状语从句

§4地点状语从句 (adverbial clause of place)

地点状语从句一般由连接副词where, wherever等引导，已经形成了固定的句型，例如：

句型1：Where＋地点从句，（there）＋主句。

【注意】此句型通常译成“哪里……哪里就……”；主句在从句后面时，there可用可不用；如果主句在从句的前面时，一般都不用there。
句型2：Anywhere/ wherever＋地点从句，＋主句。
状语从句是句子的状语由一个从句充当，来修饰主句中的动词，形容词或副词等。状语从句都由从属连词引导，与主句连接，放在句末时，一般不在前面加逗号。

状语从句根据它表示的意思可分为时间，原因，条件，比较，结果，目的等类。

时间状语从句：是由when, as, while, after, before, since, until, as soon as 等从属连词引导的状语从句。

时间状语从句中的谓语动词不能用一般将来时，只能用一般现在时表示将来发生的动作或存在的状态。

原因状语从句： because, since, as和for都表示原因。because语势最强，回答why提出的问题，用来说明人所不知的原因。当能够很明显的看出原因或人们已知原因，就用as或since。

由because引导的从句如果放在句末，且前面有逗号，则可以用for来代替。但如果不是说明直接原因，而是多种情况加以推断，就只能用for。

目的状语从句：表示目的状语的从句可以由in order that, so that,等词引导。

结果状语从句：结果状语从句常由so...that 或 such...that引导，要掌握和区分这两个句型，

首先要了解so和such后面分别跟什么词。such是形容词，修饰名词或名词词组，so是副词,只能修

饰形容词或副词。so 还可与表示数量的形容词many, few, much, little连用，形成固定搭配。

如：The box is so heavy that I can't carry it.

让步状语从句：是由though, although 引导的状语从句。

                                            高考英语11大语法总结之状语从句

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专题二 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be about to do...when...，be doing...when...，had done...when...，be on one’s way...when...，be on the point of doing...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/so long as，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 + will be/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...”。

注意：not until可用于强调句和倒装句

强调句：It is/was not until…that…倒装句：not until 放句首时，主句要部分倒装。

6、since的用法

（1）since后是非延续性动词，时间起点从该动作发生算起，意为“做某事多久了”；since后是延续性动词，时间起点从该动作结束算起,意 为“不做某事已有多长时间”。

（2）It is/has been +时间段+since+一般过去时

7、表示“一......就.....”的句型

（1）as soon as, once,immediately,directly,instantly,the moment,the minute等引导的从句都表示从句的动作一发生，主句的动作随即发生，常译作“一.....就.....”，这类从句中，经常用一般现在时态代替将来时态。

（2）on doing sth.或“on one’s+名词”作时间状语。

8、有些名词和副词可以起连接词的作用，引导时间状语从句。

注意：时间状语从句中不用将来时态。若要表示将来时间，可用一般现在时态表示。但when引导名词性从句时，从句中要使用将来时。

二、地点状语从句

1、地点状语从句由where,wherever引导。

注意：where与where的区别：Where表特定的地点，而wherever非特定的地点表。

Wherever=to/at any place where

2、地点状语从句与定语从句的区别

Where引导定语从句时，从句前应有一个表示地点的名词作先行词；而状语从句前则无先行词。

三、原因状语从句

引导词：because, since,as, now that, not that…, but that…, seeing that, considering that, in that

注意：for也可以表示原因，属并列连词，但不是说明直接原因，而是对某种情况加以推断，用于表示补充说明理由。

四、目的状语从句

引导词：so, so that, in order that, that, to the end that（以便，为了），in case,for fear that,lest（以免，以防），

目的状语从句中通常有情态动词can,could,may,might,should,would等。

注意：1、in case 还可表示“万一，假如”。

2、目的状语从句可以用so as to, in order to 等不定式代替，但主句和从句的主语必须一致。

五、结果状语从句

引导词：so...that（如...以至于...），such...that（如此...以至于...），so that（结果是），with the result that（所以，结果是）

注意（1）so...that与such...that的区别

So+形容词such+a/an+形容词+单数名词

So+形容词+a/an+单数名词such+形容词+复数名词

So+副词such+形容词+不可数名词

So many/few+复数名词

So much/little+不可数名词

（2）so that引导的目的状语从句与so that 引导的结果状语从句

目的状语从句一般使用情态动词，结果状语从句一般不使用情态动词；

结果状语从句常常用逗号与主句分开。

（3）so...that与so...as;such...that与such...as

So...that/such...that为结果状语从句；so...as/such...as为定语从句。

六、条件状语从句

引导词：if（如果），unless（除非），if only（只要，但愿），only if（只有），in case（万一），suppose/supposing(that)

（假设），provided/providing(that)（只要，假若），on condition that（要是，在...条件下），so/as long as（只要），（let's/let us)say（假设）

七、方式状语从句

引导词：as（像...一样，正如...），as if/as though（好像，宛如）

注意：1、固定句型A is to B what C is to D.意为“A对B而言正如C对D一样”。

2、as if, as though引导的从句若与事实相反，用虚拟语气；若与事实相符，不用虚拟语气。

八、让步状语从句

引导词：though/although/as（虽然，尽管），even if/though（即使，尽管），whether/no matter whether...or(not)

（不管...是否，不管是...还是）wh-ever/no matter wh-(无论...）

注意：（1）though,although,as的区别

A、Though,although的主句中可以用yet, still, nevertheless,但不可使用but。

B、though引导的从句可以倒装，也可以不倒装；as引导的从句必须倒装；although引导的从句不能倒装。

其结构为：形容词/分词/副词/动词原形/名词（无冠词）+as/though+主语+谓语……

（2）though可用作副词，放在句末，意为“不过，但是”。Although无此用法。

（3）某些短语也引导让步的从句或短语，意为“尽管”，如：in spite of the fact that, despite the fact that, regardless of（the fact that）

九、比较状语从句

引导词：as...as（和...一样），not as/so...as（和...不一样），than（比），the more...the more...（越...越...）

十、状语从句中的省略问题

1、在状语从句中如果主语与主句的主语一致，同时从句中又含有系动词be，则通常可省去从句的主语和系动词be,留下其余部分。

2、若状语从句中主语是it, 动词是系动词be, 则通常可省去主语it及系动词be,留下其余部分。

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