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高中英语状语从句用法详细解析之五兆芳芳创作一、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，放在句尾时不必.二、分类按照意义上的不合，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方法状语从句⑨比较状语从句三、时间状语从句（一）引导时间状语从句的连词有：as, when(whenever), before, after, as soon as,until(till), since, every time, once.（二）、“as” as, when, while都有“当……的时候”，可以互用When she was a child.While she was a child. She Lived in Paris.As she was a child.as有“一边…一边”的意思He sang as he walked.“when” When the clock struck twelve, all the lights went out.I was sleeping when she came in. 动补When we arrived at the station, the train had left.“while” 主、从句动作或状态同时产生.用while引导的从句用延续性动词，常暗示较长的时间或一个进程.While we were having supper, all the lights went out.Please keep quiet while others are studying.While I was writing letters last night, he was watching TV. when, while并列连问.when和while都可用作并列连问，连接并列分句.When暗示“就在……的时候”, while意反而，可是，暗示转折.One evening Beethoven was walking in a street, when he suddenly stopped outside a little house.并列连词引导并列句，意思是就在那时.（三）、主句是一般未来时，时间状语从句用一般现在时表未来，主句是过来未来时，从句用一般过来时暗示过来未来时，主句是一般过来时，从句用一般过来时.1. I' ll call you when I get there.2. They said they would leave when they got the new.3. They left as soon as they got the new.Whenever 无论什么时候，随时1. Whenever someone throws in some rubbish, the truck produces a piece of music.每当有人扔进一些垃圾时，它（汽车）就放一段音乐.2. Whenever we' re in trouble, they will help us.3. I go to the theatre, whenever I am free.4. Come and see me whenever you want to.你随时来看我.till和until(暗示“直到……”)句首多用until1、在肯定句中暗示“直到……为止”，主句谓语动词要用延续性动词.I was waiting until/till he arrived.2、在否认句中暗示“直到……才”主句谓语动词经常使用终止性动词，这时until和till常被before替换.I didn' t leavetill/until she came back.since: 主句用完成时，从句用一般过来时，since引导的从句间或可用现在完成时.It is two years since I have studied English.1. We have known each other since we were children.2. We have been friends (ever since) since we met at school.3. It is ……(一段时间)+since+一般过来时态句子.It is two years since my sister married.……(一段时间) have/has passed since +一般过来时态句子Two sisters have/has passed since my sister married.Since+时间点1. I have been at home since three o' clock this afternoon.2. Maria has been in China since two years ago.*every time, each time, next timeEvery time you get back at night, you drop your boots on the floor.Every time I catch cold, I have pain in my back.(every time 分写不成以合写) 比较everyday (adj) 日常的，普通的every day 是名词短语，每天，天天Next time I go there, I will visit them.* once 一旦…就Once you begin, you must go on. 你一开了头，就应该持续下去.四、地点状语从句地点状语从句用where, wherever引导We should go where the people need us.我们应该去人民需要我们的地方.Where there is a will, there is a way.有志者，事竟成.Wherever they went, they received a worm welcome.无论他们走到哪儿都受到热烈欢送.She follow him whose he goes. 他无论到哪里她总随着.五、原因状语从句原因状语从句用because(因为)，since(既然), as(由于)引导1、字母由多到少，语气由强到弱.2、由why提问必须用because答复.Since, as不答复why的提问，并且从句一般放在句首，because一般放在主句之后.3、 before of +名词Because of the rain, we didn' t go to the park.4、 because 和so不成连用，只能选其一.（另有although, but）Why didn' t he come to school? Because he was ill.Since I must die, I must. 既然我一定要死，我一定这样做.Since a lot of people make mistakes in life, Mr Smith wanted to give John a Chance.5、 for并列连词，不克不及放在句首，主要放在两个并列句之间.For所提供的理由为一个弥补说明，并且前面常有逗号离隔.The days we short, for it is December now.*改错 Because he is ill is the reason why he can' t come. (Because改成that)六、目的状语从句目的状语从句用so(经常使用于口语), that, so that, in order that引导目的状语从句的谓语常含有may, might, can, could, should, would等情态动词.1. We' ll sit never to the front so we can hear better.2. He studied hard so that he mightsucceed.他努力学习，以便成功.3. I' ll speak slowly so that you can take notes.我慢慢讲，以便你们能做笔记.4. They hurried to the station in order that they could catch the train.他们仓猝赶往火车站，以便能遇上火车.5.I took a taxi so that I could get there earlier.6.I' m going to the lecture early so that I may get a good seat.我打算早些去听讲座，以便找个好座位.七、条件状语从句条件状语从句由if, unless, (so) as long as(只需)引导在条件状语从句中要用一般时暗示未来时（与时间状语从句相同）We will miss the train if you don' t hurry.He said we would miss the train if we didn' t hurry.You will fail the exam unless you study hard. (if you don' t study hard)He won' t come unless he is invited. (if he isn' t invited)Eat less food unless you want to become fatter. (if you don' t want to become better)As long as you are not afraid of difficulties, you are sure to succeed.As long as you don' t lose heart, you will succeed.八、结果状语从句结果状语从句由such…that, so….that, s o that, that 引导1. such… that 的经常使用句型such +a/an +形容词+可数名词单数+thatsuch +形容词+可数名词单数+thatSuch+形容词+可数名词单数（不成数名词）+that注意so many (much, few, little) +名词，such a lot of (或lots of)+名词是习用法，不成乱用.She is such a beautiful girl that we all like her.They were such beautiful flower that we bought home.It was such delicious food that they ate it up.2. so+形容词或副词+thatso+形容词+a/an+可数名词单数+thatHe is so rich that he can buy lot of things for himself.He works so hard that he did everything well.It was so hot a day that we all went swimming.It was such a good day that we all went swimming.3.so that, that都可以引导结果状语从句He didn' t study hard, (so) that he failed theexam.4.too…to, enough…to 可以引导结果状语从句与so…that 替换，so…that结构可以用too…to替换必须具备两个条件，一是主句和结果状语从句的主语必须一致，二是从句中的谓语部分必须含有can(could) not.She is young that she can' t go to school.She is too young to go to school.She isn' t old enough to go toschool.九、让步状语从句although, thougheven though = even if, whether…orhowever = no matter howwhatever = no matter whatwhoever = no matter whowhenever = no matter whenwherever = no matter where*although和though都暗示“虽然”只是although 更正式，多用于句首，而though用于句中，两者都可与yet, still连用，但不与but连用Although/Though they are poor, they often help others.They are poor, but they often help others.Although he has failed many times, he doesn' t give up trying.Whatever/No matter what you say, I won' t believe you.No matter what you say, I don' t care.No matter who you are, you must obey the rules of our school.However hard he tried, he failed again.No matter what the weather is like, you can always find surfers out riding the waves.十、方法状语从句方法状语从句由as(如同，依照)，as if (though)引导*as和like都有“像”的意思，as是连词，前面连接句子，like是介词前面可加名词、代词或名词性短语.I did the work as others did. 相当于 I did like others.You must do as I do.asif(though)两者意义相同，从句谓语动词经常使用虚拟语气，但实现可能性较大，则用连接词.It seems asif/though it' s going to rain.They are talking as if/though they were old friends.She treats me as if I were her brother.When you are in home, do as the Romans do.例You must do ______ I told you.A. after B. before C. where D. as (D)The students must do ______ the teacher told them.A. as B. before C. after D. if (A)十一、比较状语从句比较状语从句由as…as, not as(so)…as, than, the+比较级，the+比较级引导He swims as well as you. (do)He doesn' t swim as well as you (do).He got here earlier than you. (did)The busier he is, the happier he feels.英语语法状语从句类型综述状语从句主要用来修饰主句或主句的谓语.一般可分为九大类，辨别暗示时间、地点、原因、目的、结果、条件、让步、比较和方法.尽管种类较多，但由于状语从句与汉语结构和用法相似，所以理解和掌握它其实不难.状语从句的关头是要掌握引导不合状语从句的经常使用连接词和特殊的连接词即考点.现辨别列举如下: 1．时间状语从句经常使用引导词：when, as, while, as soon as, while, before, after, since , till, until 特殊引导词：the minute, the moment, the second, every time, the day，the instant, immediately , directly, no sooner … than, hardly …when, scarcely … whenI didn’t realize how special my mother was until I became an adult. While John was watching TV, his wife was cooking. The children ran away from the orchard(果园) the moment they saw the guard. No sooner had I arrived home than it began to rain.Every time I listen to your advice, I get into trouble.2．地点状语从句经常使用引导词：where特殊引导词：wherever, anywhere, everywhereGenerally, air will be heavily polluted where there are factories. Wherever you go, you should work hard.3．原因状语从句经常使用引导词：because, since, as, since特殊引导词：seeing that, now that, in that, considering that, given that, considering that, inasmuch as, insomuch asMy friends dislike me because I’m handsome and successful. Now that everybody has come, let’s begin our conference. The higher income tax is harmful in that it may discourage people from trying to earn more. Considering that he is no more than 12 years old, his height of 1.80 m is quite remarkable.4．目的状语从句经常使用引导词：so that, in order that特殊引导词：lest, in case, for fear that，in the hope that, for the purpose that, to the end thatThe boss asked the secretary to hurry up with the letters so that he could sign them. The teacher raised his voice on purpose that the students in the back could hear more clearly.5．结果状语从句经常使用引导词：so … that, so… that, such … that, 特殊引导词：such that, to the degree that, to the extent that, to such a degree that,He got up so early that he caught the first bus.It’s such a good chance that we must not miss it. To such an degree was he excited that he couldn’t sleep last night.6．条件状语从句经常使用引导词：if, unless, 特殊引导词：as/so long as, only if, providing/provided that, suppose that, in case that, on condition thatWe’ll start our project if the president agrees.You will certainly succeed so long as you keep on trying. Provided that there is no opposition, we shall hold the meeting here.7．让步状语从句经常使用引导词：though, although, even if, even though特殊引导词： as(用在让步状语从句中必须要倒装)，while ( 一般用在句首 )，no matter …， in spite of the fact that, while, whatever, whoever, wherever, whenever, however, whicheverMuch as I respect him, I can’t agree to his proposal. 尽管我很尊敬他，我却不合意他的建议.The old man always enjoys swimming even though the weather isrough. No matter how hard he tried, she could not change her mind. He won’t listen whatever you may say. 8．比较状语从句经常使用引导词：as(同级比较), than(不合程度的比较)特殊引导词：the more … the more … ; justas …，so…; A is to B what /as X is to Y; no … more than; not A so much as B She is as bad-tempered as her mother. The house is three times as big as ours. The more you exercise, the healthier you will be.Food is to men what oil is to machine. 食物之于人，犹如油之于机械.9．方法状语从句经常使用引导词：as, as if, how 特殊引导词：the way When in Rome, do as the Roman do. She behaved as if she were the boss. Sometimes we teach our children the way our parents have taught us.。
高中英语状语从句讲解与练习高中英语状语从句一、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）则表示“当……时候”，鼓励的动作必须就是延续性的。
（2）用做同列连词，则表示相对关系“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）则表示“当……时候”，特别强调同时出现，不所指先后。
（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“正像，正如”，“做为”，“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）itwillbe/was时间段before通常现在时/通常过去时。
在肯定句中，意为“多长时间之后才”；在否定句中，意为“用没法多长时间就”。
5、until和till（1）与肯定句连用，必须是延续性动词。
（2）与否定句属格，必须不为延续性动词，则表示“直至……才，在……之前不……”。
特别注意：notuntil可以用作特别强调句和倒装句强调句：itis/wasnotuntil…that…倒装句：notuntil放句首时，主句要部分倒装。
高中易考知识点状语从句的种类和用法状语从句是汉语中一个重要的语法结构，它能够在句子中作为修饰成分，用来描述动作或状态的情况。
在高中的语文考试中，状语从句是一个常见的知识点。
本文将介绍高中易考的知识点——状语从句的种类和用法。
一、状语从句的概念与基本特点：状语从句是指在复合句中做状语的从句，它可以用来修饰动词、形容词、副词或整个句子。
状语从句通常由连词引导，与主句之间有一定的逻辑关系。
二、状语从句的种类：1. 时间状语从句：时间状语从句表示动作发生的时间，在句子中可以作时间状语，修饰主句的谓语动词。
常用的引导词有when, as, while, before, after, since 等。
例如：- I will call you when I arrive home.（当我到家的时候，我会给你打电话。
）- He became a teacher after he graduated from university.（他大学毕业后成为了一名教师。
）2. 地点状语从句：地点状语从句描述动作的地点，在句子中作地点状语，修饰主句的谓语动词。
常用的引导词有wherever, wherever, anywhere等。
例如：- She will follow you wherever you go.（无论你去哪里，她都会跟随你。
）- I can find happiness anywhere I am.（无论我在哪里，我都能找到快乐。
）3. 原因状语从句：原因状语从句描述动作的原因，在句子中作原因状语，修饰主句的谓语动词。
常用的引导词有because, since, as, for等。
例如：- I stayed at home because it was raining heavily.（因为下大雨，所以我呆在了家里。
）- Since you are tired, you should rest.（既然你累了，你应该休息一下。
状语从句一：状语从句的定义、功能、分类定义：在复合句中作状语的从句功能：状语从句在主从复合句中修饰主句中的动词，形容词或副词，或整个主句分类：按意义可分为时间、地点、原因、目的、结果、条件、方式、比较、让步等状语从句。
位置：从句的位置放在句首，也可放在句末。
放在句首时，从句后面常用一个逗号，放在句末时，从句前一般不用逗号。
二：考点与难点1、各种从属连词的含义及用法比较；2、no matter wh- 与wh-ever 引导的从句的区别；3、状语从句的时态问题；4、状语从句倒装及省略；5、状语从句与其它从句的区别。
三：九种常见状语从句用法1. 时间状语从句引导时间状语从句的从属连词1）.基本类：before、after、when、while、as、since、till、until、once, as soon as, etc.2）. 名词类the moment ,the minute, the second, the instant,etc. (一…就…); every time, each time, the last time, the first time, the day, the year, the morning etc.3）. 副词类：immediately, directly, instantly, etc. (一...就...)4）.句型类：no sooner…than…, hardly/scarcely…when…, etc. (一…就…)注意：1. when, as, whileWhen ①when表示时间点时，从句中用短暂性动词；表示时间段时，用持续性动词。
Eg:. When they were still talking and laughing, the teacher came in. （when表示段时间）2). He waved a hello when he saw her.（when表示点时间）②. 可用作并列连词，其意义为“这时,突然”，相当于and then suddenly。
高中英语状语从句用法详解内容提要：一、时刻状语从句二、地点状语从句三、方式状语从句四、程度状语从句五、缘故状语从句六、结果状语从句七、目的状语从句八、条件状语从句九、让步状语从句十、比较状语从句一、时刻状语从句:1、时刻状语从句通常用下列从属连词来引导：after, before, as, once, till, until, (ever) since, when, whenever, while, now (that), as long as, as soon as。
如：Now (that) you’ve grown up, you must stop this childish behaviour.Whenever we met with difficulties, they came to help us.Come and see us whenever you have time.People do not know the value of health till they lose it.2、有些词，如immediately, directly, instantly 等，当用于as soon as 意义时，也能够引导时刻状语从句，如：I got in touch with him immediately I received his letter.My sister came directly she got my message.The machine will start instantly you press the button.I’ll telephone you directly I hear the news.Will you look for it immediately you get there?3．某些表示时刻的名词词组，如the (very) moment ( = as soon as ), the minute ( = as soon as ), the instant ( = as soon as ), the day, theyear, the morning, every time, each time, next time, the first time 等，也能够引导时刻状语从句，如：I’ll tell you about it the moment you come.I started the instant I heard the report.The instant she saw him she knew he was her brother.Every time I catch a cold, I have pain in my back.I’m going to see him next time he comes to Shenzhen.He left Europe the year World WarⅡbroke out.He had impressed me that way the first time I met him.I started the very moment I got your letter.I’ll tell him the minute (that) he gets here.4．有些关联从属连词，如no sooner …than / hardly …when / sca rcely …when / barely …when 等，也能引导时刻状语从句。
高中英语状语从句讲解状语从句在句中作状语，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，常用逗号分开：放在主句之后，一般不用逗号。
状语从句按其意文和作用可分为时间、条件、原因、让步、目的、结果、方式、比较、地点等九种。
1.时间状语从句时间状语从句常用连词有when，as，while，before，after，since，till（until），as soon as，hardly…when…，no sooner…than，the moment等。
时间状语从句一般不用将来时，因此，主句若为将来时，时间状语从句要用一般现在时。
如：I'll go on with the work when I come back tomorrow.⏹when, while与as的异同作为从属连词，三者的意思都是“当…时候”，在用法上有如下异同点。
1.在主句的谓语动词表示短暂动作，而从句说的是一段时间发生的动作时，三个连词都可以。
如：I met him as／when／while I was doing some shopping.2.从句动作发生的时间如果是某一点，而且主句动作同时或几乎同时发生时，不能用while，而只能用when或as。
如：I met him as/when I was getting off the bus.3.当从句动作发生在主句动作之前时，只能用when，如：I will ring you up when I return.4.主句用进行时态，从句动作发生的时间如果是某一点，只能用when。
如：My mother was cooking the supper when I got home.5.如果主句和从句的动作都在一段时间发生，可用as或while，只不过as强调主句和从句中的动作同时发生，而while强调主句的动作延续于while所指的整个时间。
As I put on my coat，something fell out of the pocket onto the floor.While he was in prison，Joe Hill continued to write songs to keep up the worker's fight．⏹when的从属连词用法when作为从属连词引导时间状语从句，既可放在主句之前，也可放在主句之后。
高中英语知识点归纳状语从句的引导词和用法总结状语从句是指在复合句中，用来修饰或限制主句动词、形容词、副词或整个句子的从句。
状语从句的引导词即是用来引导状语从句的连接词，根据不同的状语从句种类和构成，引导词也不尽相同。
下面将对高中英语中常见的状语从句引导词及其用法进行归纳和总结。
1. 时间状语从句：时间状语从句用来表示主句的动作发生的时间关系。
常见的引导词有：when（当…时候）、while（当…的时候）、before（在…之前）、after（在…之后）、as（当…的时候）、since（自从…以来）、until/till（直到…为止）、once（一旦）、whenever（无论何时）等。
例如：- I will call you when I arrive. （我到了之后会给你打电话。
）- She waits for him until he finishes his work.（她等他直到他工作完成。
）- After she finished her homework, she went to bed.（她完成作业后就去睡觉了。
）2. 地点状语从句：地点状语从句用来表示主句的动作发生的地点或位置。
常见的引导词有：where（在哪里）、wherever（无论哪里）、anywhere（任何地方）等。
例如：- I will meet you where we agreed.（我会在我们约定的地方见你。
）- You can go anywhere you want.（你可以去任何你想去的地方。
）3. 原因状语从句：原因状语从句用来表示主句的动作发生的原因或理由。
常见的引导词有：because（因为）、since（因为）、as（因为）、now that（既然）、due to（由于）等。
例如：- She didn't come to the party because she was sick.（她因为生病没来参加聚会。
状语从句1. 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，可以表示主句的动作和从句的动作同时发生，或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 adopted 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）②when还可表示just then（正在那时）的意思，此时其所引导的从句只放在主句之后。
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侧重表示主句和从句的动作并相发生,翻译成一边，一边。
We were having breakfast as she was combing her hair. 她梳头时我们在吃早饭。
(3) while引导的时间状语从句while或“在……期间”，所引导的从句的动作是延续性的，并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) before引导的时间状语从句①before“在……之前”I’ll be back before you have left.你离开之前我就会回来。
②before“……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 I came back. 他三天后才回来。
(5) 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immediately，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。
(6) hardly...when/no sooner...than引导的时间状语从句关联从属连词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。
如：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。
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。
(7) 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、过去完成时和一般现在时：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，这里发生了巨大变化。
(8) till/until引导的时间状语从句till和until同义，作“直到……时(为止)”解，till多口语话，until多用于句首。
如：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。
2. 地点状语从句(1) where引导的地点状语从句，很简单，最基础的。
从属连词where“在（或到）……的地方”Where there is a will, there is a way. 有志者事竟成。
Put it where you found it. 把它放在原来的地方。
①where 在地点状语从句中，除指地点外，还可指处境等。
就看句子翻译了。
如：He said he was happy where he was. 他说他对自己的处境很满意。
It’s your fault that she is where she is.她今天落到这个地步都怪你。
(2) wherever引导的地点状语从句wherever=no matter where,后者只能放句首。
从属连词wherever“在（或到）……的各个地方”：You can go wherever(anywhere) you like these days. 这些天你可以去你想去的地方。
Where (no matter where) they went, the experts were warmly welcomed.专家每到一处，都受到热烈的欢迎。
Sit down wherever you like. 你喜欢坐哪儿就坐哪儿wherever不可以换成no matter where 3. 原因状语从句(1) because引导的原因状语从句通常用于回答why引出的疑问句，语气最强，该从句一般位于主句后面。
I didn’t go abrord with her because I couldn’t afford it.我没有和她一起出国是因为费用太高。
Don’t scamp your work because you are pressed for time.不要因为时间仓促而马马虎虎。
(2) as引导的原因状语从句as引导的原因状语从句多位于主句之前，通常可以和since换用。
如：As I didn’t know the way，I asked a policeman. 我不认识路，因而问警察。
As it is snowing, we shall not climb the mountain. 由于在下雪，我们不去爬山了。
(3) since引导的原因状语从句since引导的原因状语从句多位于主句之前，通常可以和as换用。
与as用法一样Since traveling by air is much faster,they decided to take a plane. 既然乘飞机旅行快得多，他们就决定坐飞机。
Since you won’t help me ，I’ll ask someone else. 你既然不帮我，那我就请别人帮忙。
(4) now(that)引导的原因状语从句now(that)“既然”，Now(that) you have passed your test you can drive on your own. 你既已考试合格，就可以独自开车了。
(5) seeing (that)引导的原因状语从句Seeing (that)“鉴于；由于”，通常用于非正式文体。
如：Seeing (that) the weather is bad，we’ll stay at home. 天气不好，我们还是呆在家里吧。
4. 目的状语从句(1) in order that引导的目的状语从句in order that“为了；以便”。
多用于正式文体，通常可以与so that换用。
如：You stopped at Hangzhou in order that they could go around West Lake.他们在杭州停了下来，以便游览西湖。
The expert spoke slowly in order that everyone should understand.专家讲得很慢，以便人人听得懂。
(2) so (that)引导的目的状语从句so that“为了；以便”。
so that通常可以与in order that换用，它所引导的目的状语从句总是放在主句之后，在非正式文体中，常省略that。
如：Speak clearly so that they may understand you. 你要讲得清楚，他们才听得懂。
She wanted tea ready at seven so she could be out by eight.她要七点钟备好茶点，这样她八点以前就可以出门了。
(3) in case/for fear (that)等引导的目的状语从句in case，for fear(that)这俩个从属连词都表示否定目的，意思是“以免”,“以防”。
in case它所引导的从句中的谓语动词可以是陈述语气形式，也可以是虚拟语气形式；for fear(that)引导的从句中的谓语带有may，might，should等情态动词Take your umbrella in case it rains. 带上你的伞，以防下雨。
He took an umbrella with him for fear that it might rain. 他带了一把伞，以防下雨。
1. 结果状语从句(1) so that引导的结果状语从句①so that引导的结果状语从句只能位于主句之后，so that”引导什么从句根据句意来判断Suddenly it began to rain heavily，so that it was almost impossible to carry on driving.突然下起了大雨，几乎无法继续开车。
