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状语从句状语从句在历年来的高考试题中也是一个测试的热点项目。
对于这一语法项目，应该重点把握以下内容：一、状语从句的分类及引导各类状语从句的从属连词：1．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，the minute), by the time, no sooner ... than, hardly (scarcely) ... when, every time等引导。
2. 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有because, since, as, for,有时候也用now that（既然），seeing that（既然）, considering that(照……来看), in that（因为）等。
Now that you have finished the work, you are free to do whatever you like.3. 地点状语从句：引导地点状语从句的连词有where，wherever等。
如：Sit wherever you like. / Make a mark where you have a question.4. 目的状语从句：引导目的状语从句最常用的词（组）是so，so that, in order that，in case / for fear that（以防，以免），lest（以防）等，目的状语从句中的谓语动词前常带有情态动词。
如：Speak clearly, so that / in order that they may understand you.The farmers put up iron fences around the flower garden for fear that the neighbor’s sheep (would) break in.5. 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。
高考英语重要语法知识：状语从句定义：在句中作状语的从句是状语从句，修饰主句中的动词、形容词或副词等。
状语从句由从属连词引导，从属连词在句中不充当句子成分，只起连接作用，状语从句放在句首时，要用逗号，放在句尾时不用。
分类：根据意义上的不同，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目的状语从句⑤条件状语从句⑥结果状语从句⑦让步状语从句⑧方式状语从句⑨比较状语从句一、时间状语从句引导时间状语从句的连词有：as, when(whenever),while, before, after, as soon as, until(till), since,every/each/next time, once.（ as, when, while都有“当……的时候”，可以互用）◆When、While、as的区别：①when是at or during the time ,既指时间点，也可指一段时间，因此when引导的时间状语从句中的动词可以是终止性动词，也可以是延续性动词；while是during the time,只指一段时间，所以while从句中的动词必须是延续性动词。
②when说明从句的动作和主句的动作可以是同时，也可以是先后发生；when从句多用一般过去时while主从句动作或状态同时发生。
while从句多用过去进行时eg. When the teacher came in,we_____________________(talk).When the clock struck twelve,all the lights went out.When we arrived at the station,the train had left.While we _____________(have)supper,all the lights went out.While I was writing letters last night,he was watching TV.④when和while还可作并列连词when表示“就在那时”； while表示“然而”，表前后意思的对比。
状语从句1.引导状语从句的连词时间状语从句when（as、while）（当……时候）、since（自从）、before（在……之前）、after（在……之后）、until（till）（直到……才）、whenever（每当）、once （一旦）、every time（每当）、the day（在……那天）、as soon as（一……就）、hardly（scarcely）……when（一……就）、no sooner……than（一……就）、instantly（immediately、directly）（一……就）、the moment（minute、second、instant）（一……就）地点状语从句where（在……地方）、wherever（在任何地方）、every where（在每个地方）原因状语从句because(as、for)（因为）、since（既然）、when（既然）、now（that）（既然）、in that（因为、既然）条件状语从句if（如果）、unless（除非）、as（so）long as（只要）、providing （provided）（that）（假如）、suppose（supposing）（that）（假如）、in case（如果）、only if（如果）、if only（但愿、如果……就好了）、on condition that（条件是）让步状语从句though（although）（虽然）、even if（even though）（即使）、while（虽然、尽管）、whatever（no matter what）（无论如何）、whenever（no matter when）（无论何时）、wherever（no matter where）（无论哪里）、whoever（no matter who）（无论谁）、however（no matter how）（无论怎样）、for all（that）（尽管）、granting（granted） that（即使）、whether……or（不论……还是）、in spite of （despite）the fact that（不管）结果状语从句so that（so、that）（结果）、so（such）……that（如此……以至于）、but that（but）（要不是）目的状语从句so that（so、that）（为了、以使）、lest（以防）、in case（以防、以免）、for fear that（以防）、in order that（为了）比较状语从句than（比……）、as……as（像……一样）、not so（as）……as （不像……一样）、（not）the same as（（不）同……一样）、not so as（不如）、（not）such……as（（不）如……）方式状语从句as（像……、犹如……）、as if（as though）（好像、仿佛）、the way（……的样子）2、时间状语从句（表示时间的状语从句）①when、whenever、while和aswhen意为“当……时候”，表示某个具体的时间。
高考状语从句总结高考三大从句：定语从句、名词性从句和状语从句。
状语从句：句子的状语部分由一句话构成。
Tome will tell me the truth when he comes back.(时间状语）If it doesn’t rain,we will go swimming.(条件状语）二．分类1.时间状语从句2.地点状语从句3.原因状语从句4.结果状语从句5.条件状语从句6.目的状语从句7.让步状语从句8.方式状语从句9.比较状语从句三．化解1.时间状语从句：when,since,until,beforeWe have lived in Chengdu since we came to Sichuan.Finish your homework before you go out to play.主要考的是时态。
2.地点状语从句：where,wherever,anywhereThey are planting the trees where there is plenty of water and sunlight.Wherever you go , I will follow you.3.原因状语从句：because,as,for,sinceAs the weather was fine ,we decided to climb up the mountain.Since you have finished your work,let’s go now.4.结果状语从句：so...that,such...thatHe ran so fast that we couldn’t catch up with him.It is such fine weather that we decide to have a picnic.5.条件状语从句：if,unless,as long as,so long as,in case,providedAs long as he is alive,he will work.Take a taxi in case you are late for the class.6.目的状语从句：so that,in order thatHe spoke slowly so that everyone could understand him.You will need to study for many years in order that you may become a doctor.7.让步状语从句：although,though,as(although可放在句首，though不能放在句首）Although he was tired,he still kept working.8.方式状语从句：as,as ifIt looks as if it is going to rain.9.比较状语从句：as...as,thanThis machine is much heavier than that one.四．落地检验——高考真题__volleyball is her main focus,she is also great at basketball.A.SinceB.OnceC.WhileD.Unless___they decide which college to go to,students should research the admission procedure.A.AsB.WhileC.UntilD.OnceOnce bitten ,twice shy.一朝一朝被蛇咬，三年怕井绳。
高考英语语法：状语从句一.定义: 在句中作状语的从句就叫做状语从句二.分类: 状语从句包括以下八类1.时间状语从句: 由when, while, as, before, after, since, till / until, as soon as等引导a. I shall tell him the good news when he comes.2.原因状语从句: 由because, as, since, for等引导a. He didn’t hear me because he was listening to the radio.b. Since you are free today, you had better show me how to use the computer.3.地点状语从句: 由where等引导a. Please put the book where it was after you finish reading it.4.条件状语从句: 由if, unless等引导a. I will come to see you if I have time on Sunday.5.比较或方式状语从句: 由than, as, as if, as...as...等引导a. I know you do better th an he does.b. The old worker runs very fast as if he were a young man.6.目的状语从句: 由so that, in order that等引导a. They set out early so that they could arrive at the station in good time.7.结果状语从句: 由so, so that, so / such...that...等引导a. They set out early so that they arrived at the station in good time.b. He finished his work so well that the boss praised him in public.8.让步状语从句: 由though / although, even if, whatever, whoever, whenever, no matter what / who等引导a. He is in very good health though he is old.b. They didn’t stop working even if it began to rain hard.三.应注意的问题:1.时间和条件状语从句中常用一般时代替将来时a. I will go and see a film if I have time tomorrow.b. I will tell the about it as soon as he comes back.c. He said he would go out for a walk when he finished his work.2.状语从句中可有省略: 在一个含有状语从句的复合句中, 如果主句和状语从句的主语相同, 或状语从句的主语是it, 并且状语从句的谓语含有be动词时, 可以将状语从句的主语和be 一起省略掉a. As (she was ) a child, she began to learn English.b. If ( he was ) al ive, he must be at least ninety years old.c. Althou gh ( he was ) told to stop, he kept on working.d. If ( it is) necessary, ring me up.e. He didn’t say a single word unti l ( he was ) asked.3.as和than引导的比较状语从句中, 从句中和主句中相同的部分往往省略, 从句中只剩下比较对象a. He is a head taller than I ( am tall ).than之后的人称代词是主格或宾格时, 有时意思不同, 如:a. She likes the dog more than me.=She likes the dog more than she likes me.她喜欢狗比喜欢我更多b. She likes the dog more than I.=She likes the dog more than I like the god. 她比我更喜欢狗4.含有no soonerthan和hardly / barely / scarcely when的句子相当于含有as soon as引导的时间状语的句子.no sooner或hardly放在句首时, 主谓要部分倒装a. He had no sooner seen the policem an than he ran away. =No sooner had he seen the p oliceman than he ran away. =He ran away as soon as he saw the policemen.b. He had hardly sat down when the telephone rang. =Hardly had he sat down when the telephone rang. =The telephone rang as soon as he sat down.5.immediately, directly, instantly等词也可以作为连词引导时间状语从句, 相当于as soon as引导的时间状语a. I went to see him immediately I heard from him. =I went to see him as soon as I heard from him.6.the moment, the minute, the second引导时间状语从句, 相当于as soon as引导的时间状语a. He let out a cry the moment he saw the snake.=He let out a cry as soon as he saw the snake.7.each time, every time, any time, last time, next time, first time可以引导时间状语从句a. They shake hands with each other each time they meet.8.since引导的时间状语从句中, 若谓语动词是延续性动词或状态动词, 则其过去时表示动作的完成或状态的结束a. It is five years since he lived here. 他不住这里己有五年了a. They shake hands with each other each time they meet.8.since引导的时间状语从句中, 若谓语动词是延续性动词或状态动词, 则其过去时表示动作的完成或状态的结束a. It is five years since he lived here. 他不住这里己有五年了。
高考英语语法复习：八种状语从句的用法状语从句状语从句有时间、地点、原因、目的、方式、结果、条件、让步等八种。
一、时间状语从句：引导词有after，before，as，once，since，till，until，when，whenever，while，as soon as，the moment/minute…(一…就)，the time,the day,every time,next time,each time，by the time of，no sooner…than(一…就)，hardly…when(一…就).例如：Each/Every time he comes here,he will drop in on me.每次他来这儿他都顺便看我.He was ill last time I saw him.上次我见到他时他病了.No sooner had she heard the news than she cried.她一听到这个消息就哭了.[辨析]when与whilewhen引导的从句动词可以是延续性的或短暂性的，while引导的从句中动词必须是延续性的;在“be…when…”句式中when表“at that time(就在这时)”意，这样用的when不能换为while;while有时并不表示时间，而表示对比，意“而”、“却”，when无这样的用法。
例如：When I got home I found the door locked./While(或When)we were working in the fields,it suddenly began to rain./He was wandering through the streets when a bike hit him./His pencil is red,while mine is yellow.[辨析]till与until一般情况下可以互换，但until可以位于句首，till则不能。
高中英语语法：状语从句知识点状语从句(adverbial clause)在句中作状语，可修饰主句中的动词、形容词和副词等。
状语从句由从属连词引导。
状语从句可放在句首或句末。
放在句首时，从句后面常用逗号；放在句末时，从句前面往往不用逗号。
状语从句根据它们的含义分为时间、地点、原因、目的、结果、方式、让步、条件、比较等九种。
一、时间状语从句1、while, when, whenever和as的用法比较（1）while常表示一段较长的时间或一个过程，强调主句的动词和从句的动词所表示的动作或状态是同时发生的。
它不能表示一时性或短暂的动作。
Don't talk so loud while( as) others are working.别人工作时，请勿大声说话。
（2）when引导的时间状语从句，可指时间的一点，也可以指一段时间，从句的谓语动词可用终止性动词，也可用持续性动词。
when引导的从句表示的具体的时间，从句的动作和主句的动作可以同时，也可以先于主句的动作。
Whenever指任何一个不具体的时间。
It was raining when we arrived. 我们到达时，天正下着雨。
（动作同时，指时间点）When you read the poem a second time, the meaning will become clearer to you.当你再读一遍这首诗，你就更清晰它的含意。
（动作有先后，指时间点，不能用while）Come whenever you like. 你爱什么时候来就什么时候来。
（3）as用as时主句和从句的动作往往同时发生，具有延伸意义，一般同延续性动词连用，有时可译作“一边…一边…”。
As time went on, his theory proved to be correct.随着时间的推移，他的理论被证明是正确的。
As（when）he finished the speech, the audience burst into applause.他讲话结束的时候，听众掌声雷动。
高中英语语法状语从句一、基本概念状语(副词性)副词 动词/句子（形容词/其它副词）介词短语、动词不定式、分词短语、形容词、状语从句分类时间、地点、原因、目的、结果、条件、让步、比较、方式二、分论（一）时间状语从句(1) when 引导的时间状语从句①when 引导的时间状语从句，其动词既可以是延续性动作的动词，也可以是瞬间性动作的动词，而且可以表示主句的动作和从句的动作同时发生，或者从句的动作发生在主句的动作之前。
when you apply for a job, you must present your credentials.当你申请工作时，你必须递交你的有关证件。
（同时）when the students heard the teacher’s footsteps, they all atopped talking.当学生们听到老师的脚步声时，他们都停止了讲话。
（从句动作发生在前） ② when 还可表示just then （正在那时，突然）的意思，此时其所引导的从句只放在主句之后。
be about to do …when … 正要去做某事，突然……be doing …when…正在做某事，突然……be on the point of doing …when…正在做某事，突然……We were about to start when it began to rain.我们正要动身，突然天下起雨来。
The game had hardly/scarcely/barely begun when it started raining.比赛刚刚开始就下起雨来。
(2) as引导的时间状语从句as引导的时间状语从句其动词的动作是延续性的，而且侧重表示主句和从句的动作交替或同时发生，译为“一边……，一边……”或“随着……”We were having breakfast as she was combing her hair.她梳头时我们在吃早饭。
高考英语语法考点之时间和地点状语从句考点详解【命题解读】历年高考对状语从句得考查集中在九大状语从句上，尤其是when, ,while, as等等从属连词引导的时间状语从句、让步状语从句、条件状语从句上。
【命题预测】预计2021年高考仍然对状语从句的考查将集中在从句的引导词上，还会结合其它考点一起考查。
【复习建议】1.掌握各种从属连词；2.熟悉九大状语从句；3.掌握状语从句中的省略以及常考的重点句型。
作状语的句子为状语从句，修饰主句中的动词、形容词或副词等。
状语从句放在主句之前时，常用逗号隔开;放在主句之后时，一般不用逗号。
状语从句按其意义和作用可分为时间、地点、原因、目的、结果、条件、方式、比较、让步等。
引导状语从句的连词归纳如下:考向一时间状语从句一、when/while/as引导的时间状语从句1. when引导的时间状语从句1. when引导的时间状语从句，其动词既可以是延续性动作的动词，也可以是瞬间性动作的动词，而且可以表示主句的动作和从句的动作同时发生，或者从句的动作发生在主句的动作之前。
When you apply for a job, you must present your credentials. 当你申请工作时，你必须递交你的有关证件。
（同时）When the students heard the teacher’s footsteps, they all atopped talking. 当学生们听到老师的脚步声时，他们都停止了讲话。
（从句动作发生在前）2. when还可表示just then（正在那时，突然）的意思，此时其所引导的从句只放在主句之后。
be about to do ... when ... 正要去做某事，突然……be doing ... when ... 正在做某事，突然……be on the point of doing ... when ... 正在做某事，突然……We were about to start when it began to rain. 我们正要动身，突然天下起雨来。
The game had hardly/scarcely/barely begun when it started raining. 比赛刚刚开始就下起雨来。
2. while引导的时间状语从句while表示＂在某一段时间里＂或＂在……期间＂，其所引导的从句的动作是延续性的，并侧重表示和主句的动作同时发生。
When the teacher paraphrased the text in English, the students listened attentively and took notes. 当老师用英语解释课文时，学生们聚精会神地听并做着笔记。
I can learn while I work. 我可以边工作边学习。
4.as引导的时间状语从句as引导的时间状语从句其动词的动作是延续性的，而且侧重表示主句和从句的动作交替或同时发生，译为＂一边……，一边……＂或＂随着……＂。
We were having breakfast as she was combing her hair. 她梳头时我们在吃早饭。
It will warm up a little bit on Sunday as the cold front passes. 寒流一过，星期日就会有点暖意了。
二、before引导的时间状语从句1、before的常见意思1). before＂在……之前＂。
I have finished my dissertation before my supervisor went abroad. 在我的导师出国之前，我已完成了我的学位论文。
I’ll be back before you have left. 你离开之前我就会回来。
2). before＂……之后才＂。
It may be many years before we meet again. 可能要过许多年我们才能再见了。
It was three days before he came back. 他三天后才回来。
3). before＂尚未来得及＂Before she could move,she heard a loud noise,which grew to a terrible roar.她还没有来得及动弹，就听见有很响的声音，接着就成了可怕的隆隆轰鸣声。
Before they reached the house,a new great wave came,sweeping down trees,and sweeping them down too.他们还没到屋子，又一个巨浪打来，冲倒了树，也冲倒了他们。
4). before＂要……先……＂You should be a pupil before you become a teacher.要当老师，先作学生。
5).before＂趁……＂You should do it before it is too late.趁现在还不算太晚，你应该赶快做它。
2. 掌握热点句型用法1). it was（not）/had done＋一段时间＋before（vt-ed）…＂还要过多久才……（不多久就……了）＂It was not long before he returned to Beijing.不久他就回到北京。
It was long before he married Wei Fang.过了很久他才娶魏芳。
2).it will（not）be＋一段时间＋before（一般式）… ＂还要过多久才……（不多久就……了）＂It will be long before he goes abroad.要过很久他才出国。
3.there is +一段时间+to go（=left）＋before（一般式）... ＂在……之前＂4.long before ＂不久前＂, 用于一般过去时和完成时中；before long = soon/not long after ＂不久后＂，用于一般将来时和一般过去时中。
三、as soon as/once/directly/the instant等引导的时间状语从句as soon as 是最常见的表示＂一……就……＂的从属连词，其他连词还有once（一旦），directly（老式英国英语），immediately（主要用于英国英语），instantly，the instant (that)，the minute(that) ，the moment(that)等，它们通常都可与as soon as换用。
As soon as we got home, the telephone rang. 我们一到家，电话就响了。
I recognized her immediately I saw her. 我一看见她就认出她来了。
Directly the teacher came in everyone was quiet. 老师一进来，大家就静了下来。
四、hardly...when/no sooner...than引导的时间状语从句hardly/barely/scarcely...when和no sooner...than的意思是＂刚……就＂，它们所引导的从句中的谓语动词通常为过去完成时。
He had no sooner (no sooner had he) arrived home than he was asked to start on another journey. 他刚一到家，就又要他出另一次差。
★hardly/barely/scarcely和no sooner置于句首时，从句要倒装。
No sooner had the words been spoken than he realized that he should have remained silent. 这些话刚一出口，他就意识到自己应该保持沉默。
五、since引导的时间状语从句在含有since引导的时间状语从句的复合句中，从句的谓语动词通常为一般过去时，主句的谓语动词通常为现在完成时。
We’ve never met since we graduated from the college.大学毕业后我们就再没见过面。
Great changes have taken place since you left. 你走了以后，这里发生了巨大的变化。
六、till/until引导的时间状语从句till和until同义，作＂直到……时(为止)＂解，till多用于非正式文体，until多用于句首。
Donald will remain in college until (till) he finishes his Ph.D course. 唐纳德将留在学校直到完成他的博士学位课程。
I won’t go with you until (till) I finished my homework. 等我做完作业我才和你一起去。
注意：not until 置于句首，主句要倒装。
Not until 4:00 in the morning can he fall asleep.直到凌晨4点他才睡着。
(He can’t fall asleep until 4:00 in the morning.)Not until he returned did we have supper.直到他回来我们才吃晚饭。
(We didn’t have supper until he returned.)七、each time/every time等引导的时间状语从句这类连词主要有every time(每次)，each time(每次)，(the) next time(下次)，any time(随时)，(the) last time(上次)，the first time(第一次), by the time(当……的时候)。
如：You can call me any time you want to. 你随时都可以给我打电话。
Each time I went there, I saw him working. 我每次去那儿都看见他在工作。
Every time I see her I'll think of it. 每次我看到她，我就想起这事。
Next time you come in, please close the door. 下次你进来，请关门。
He didn't tell me the last time I saw him. 我上次见到他时他没告诉我。
