as引导的方式状语从句

as引导方式状语从句,限制定语从句和非限制定语从句的区别是什么1. 方式状语从句:方式状语从句通常由as, (just) as…so…, as if, as though引导。

1)as引导行为方式状语从句时,意为“如同……”､“按照……的方式(样子,办法)”｡这种从句常位于主句之后｡例如:You must try to hold the tool as I do. 你必须像我这样拿工具｡Leave the things as they are. 别动这些东西｡We must do as the Party tells us (to do). 我们必须按照党的指示办事｡2)(just) as…so…结构中位于句首，这时as从句带有比喻的含义，意思是"正如…"，"就像"，多用于正式文体.例如：Always do to the others as you would be done by. 你希望人家怎样待你，你就要怎样待人。

As water is to fish, so air is to man. 我们离不开空气，犹如鱼儿离不开水。

Just as we sweep our rooms, so we should sweep backward ideas from our minds. 正如打扫房屋一样，我们也要扫除我们头脑中落后的东西。

2) as if/though引导的方式状语从句比较容易区分,这里不做解释.2. as引导限制性定语从句时,构成“the same ... as ...”, “such ... as ...”, “as many (much, few, little) ... as ...”等结构｡as可替代先行词,在从句中作主语､表语､宾语或状语｡例如: He isn’t the same person as he used to be. 他不再是过去那个样子了｡I have never heard such a story as he is telling. 我从来没有听见过像他正在讲述的这种故事｡Here is a bottle of pure water. You may use as much of it as you need. 这里有一瓶纯净水,你需要多少就用多少｡This is the same watch as I have lost. 这块表和我丢失的那块表一样｡In those days, many youths lived in the same way as the villagers did in the mountains. 那些日子里很多青年人跟山区的老百姓一样生活｡3. as引导的非限制性定语从句,可以修饰整个主句和主句中的一部分｡从句可位于主句之前､句中或主句之后,通常用逗号将其与主句隔开｡这时as可译为“正如”､“正像”｡例如:As is reported in the newspaper, talks between the two countries are making progress. 正如报纸上报道的那样,两国之间的会谈正取得进展｡He is an Englishman, as I know from his accent. 从他的口音,我知道他是英国人｡As was usual with him, he went out for a walk after dinner. 像往常那样,他吃完饭后就出去散步了｡As is often the case, we have overfulfilled the production plan this year. 像往常一样,我们今年又超额完成了生产计划｡This machine, as might be expected, has stopped operating. 正如人们所料,这台机器已停止转动了｡He came very early this morning, as (was) usual. 像往常一样,他今天早上来得很早｡常见的这种定语从句还有: as has been said before(如前所述); as is mentioned above(如上面提到的); as may be imagined(正如可想象的那样); as is well known to us all(众所周知); as (sb) all know(众所周知); as often happens(正如经常发生的那样); as has already been pointed out(正如已经指出的那样); as we all can see(正像我们都能看到的那样)等｡4. 最后做个总结,估计楼主你也看得个头晕脑涨,找不到要害所在!1) 定语从句你很应该明白的,此时的as一定会具有先行词(名词短语,代词,主句或主句的一部分)的含义,并一定要在定语从句中做一定的成分.你可以再去看看上面的那些例子!如:This is the same watch as I have lost.as代替the watch在定语从句中充当lost的宾语.而as引导方式状语从句时,你可以看出as只是个连词而已,它既不会代指主句的任何成分,更不在从句中做什么成分,它只是引导词起个引出从句的作用而已,就像when/while/if/although一样.而且as的前面不一定就是名词性的结构(就好比先行词一样),它引导这个从句只是整个大句的一个状语而已.如:We must do as the Party tells us (to do).当然as引导的方式状语从句经常出现省略的语法现象,这时只有靠你自己慢慢去体会,不要又混同于定语从句了.2)至于as引导的限制性和非限制性定语从句之间的区别,这就简单多了.最明显的区别就是主句和从句之间有没有逗号隔开;而且as引导的非限制性定语从句的位置灵活,可在主句前后甚至是中间都可以,经常会有一些"as we all know"这样常见的结构.但是as引导的限制性定语从句则是较为固定的“the same ... as ...”, “such ... as ...”, “as many (much, few, little) ... as ...”等结构.最后一点,as引导的非限制性定语从句,as可代指整个主句; 而as引导的限制性定语从句中,as所代替的一般只是名词短语.。

as 引导方式状语从句
as引导方式状语从句:表示“按照”，“以..…方式”，“像.....一样”，“正如”。

Do as the Roman。

as引导时间状语从句:与when、while相比,as多用于口语，强调“同一时间”或“时间一先一后”或者“随着”。

as引导原因状语从句:与because相比，较口语化，所表达的原因语气较弱，所表达的原因比较明显，或是已知的事实。

as引导比较状语从句:基本结构是as...as，前一个as是副词，后一个as是比较状语从句的连词。

as引导让步状语从句:表示“尽管。

方式状语从句
方式状语从句是英语语法状语从句的一种，常见的引导词有表示“像……”的as和表示“好像……”的as if/as though。

方式状语从句的例句有：Let’s study as Lei Feng studied. 让我们像雷锋那样学习吧；Think as I think. 像我这样去想。

状语从句知识点
状语从句= 引导词/词组+ 主谓结构，状语从句位于句首/句中时通常用逗号与主句隔开；位于句尾时可以不用逗号隔开。

当具备以下两个条件时，状语从句中可以适当进行省略。

主句和从句的主语一致，或从句主语为it，从句主要动词是be的某种形式。

从句中的主语和be动词常可省略。

As引导从句专属，看完就不用愁了？as一词在不同的句子中有不同的含义和用法，且可引导多种从句。

因此，弄清楚as引导各种从句的特征，对理解句子的含义至关重要。

一、as作从属连词，引导不同种类的状语从句1、as引导时间状语从句此时，as译作“当……时候”，可以放在主句之前，也可以放在主句之后。

例如：He smiled as he said goodbye to me.他向我道别时微笑了一下。

As she was walking in the park, she heard a girl singing. 她在公园里散步时，听到一位女孩在唱歌。

I sang an English song as I went along the river.我边沿河边走边唱英文歌。

2、as引导原因状语从句表示已知的原因，译作“既然；由于；因为……”，通常放在句首。

例如：As it is too late for you to go home, you’d better stay over night at this place.由于天太晚，你不能回家了，你最好留在这儿过夜。

As it is going to rain, the sports meet will be put off until next week.由于天要下雨，运动会将推迟到下星期开。

3、as引导比较状语从句as引导比较状语从句有两种结构，分别是“as…as”和“not as / so …as”结构。

第一个as是副词，第二个as是连词。

译作“跟……一样”、“跟……不一样”。

这种从句有三种不同的结构形式和意义。

（1）表示两个不同的人（或物）在相同（或不同）方面的比较。

例如：He is as careful as his elder brother.他和他哥哥一样细心。

She is not so clever as her sister.她不如她姐姐聪明。

介词as的用法总结
1、as做介词，意思是“作为”
例句：
French is known as the most beautiful language in the world.
法语以世界上最美丽的'语言著称。

2、as做连词，引导时间状语从句，意思是“当……的时候”
例句：
My mother was cooking fish as I arrived home.
当我到家的时候，我妈妈正在做鱼。

3、as做连词，引导原因状语从句，意思是“因为”
例句：
As rain has fallen, the air is cooler.
因为下过雨，所以空气比较凉爽。

4、as做连词，引导让步状语从句，意思是“虽然”
例句：
Young as he is, he has been one of the most famous painters in our country. 虽然他还很年轻，但已经成为我们国家最有名的画家之一。

5、as做连词，引导方式状语从句，意思是“以……方式”
例句：
Do as the Romans do when in Rome.
入乡随俗
6、as做关系代词，引导定语从句
例句：
This is the same game as I played yesterday.
这和我昨天玩的游戏一样。

as引导的五种状语从句以as引导的状语从句是英语中常用的一种从句结构，可以用来修饰句子的动作或状态，表达原因、方式、时间、条件和比较等关系。

下面列举了十个以as引导的状语从句，分别用于不同的语境和目的。

1. 原因状语从句：As it was raining heavily, we decided to stay indoors. (因为下大雨，我们决定待在室内。

)在这个例子中，as引导的状语从句表达了下雨的原因，解释了为什么我们决定待在室内。

2. 方式状语从句：He speaks English fluently, as if he were a native speaker. (他说英语很流利，就像是母语一样。

)这个例子中的as if引导的状语从句用于描述他说英语的方式，暗示他非常熟练。

3. 时间状语从句：She left early for work, as she didn't want to be late. (她早早就去上班了，因为她不想迟到。

)as引导的状语从句表达了她早早离开的时间原因，解释了她为什么不想迟到。

4. 条件状语从句：As long as you study hard, you will pass the exam. (只要你努力学习，你就会通过考试。

)这个句子中的as long as引导的状语从句表示条件，说明只要你努力学习，就能通过考试。

5. 比较状语从句：She is as tall as her sister. (她和她妹妹一样高。

)这个例子中的as引导的状语从句用于进行比较，表示她和她妹妹的身高一样。

6. 原因状语从句：As I was tired, I decided to go to bed early. (因为我累了，所以我决定早点上床睡觉。

)这个例句中的as引导的状语从句解释了我决定早点上床睡觉的原因，即因为我累了。

7. 方式状语从句：He ran as fast as he could to catch the bus. (他尽可能快地跑去赶公交车。

as的倒装用法归纳总结as的倒装用法主要有以下几种情况：1. as引导的让步状语从句倒装：He is beautiful as he is. （正常语序：He is as beautiful as he is.） Young as he is, he has achieved great success. （正常语序：He has achieved great success as young as he is.）2. as引导的方式状语从句倒装：Try as he might, he couldn't open the door.（正常语序：He couldn't open the door as he might try.）Clever as he is, he failed the exam.（正常语序：He failed the exam as clever as he is.）3. as引导的原因状语从句倒装：As it rained heavily, we decided to stay at home.（正常语序：We decided to stay at home as it rained heavily.）As she was sick, she couldn't come to the party.（正常语序：She couldn't come to the party as she was sick.）4. as引导的让步状语从句倒装：Do as he says.（正常语序：Do as he says.）Speak as he did, nobody could understand him.（正常语序：Nobody could understand him as he spoke.）5. as引导的比较状语从句倒装：Young as he is, he is very responsible.（正常语序：He is veryresponsible as young as he is.）Difficult as it is, she enjoys the challenge.（正常语序：She enjoys the challenge as difficult as it is.）需要注意的是，as引导的倒装句通常只用于口语或文学作品中，书面语中较少使用。

as状语从句的用法
as 引导的状语从句
1） as 引导时间状语从句,意为“随着……”,常与比级连用.
例如：We get wiser as we get older.
2). as 引导让步状语从句.需将表语或状语前置,有时也可用that / though 代替 as .
例如：Clever as he was, he still failed in examinations.
3） as 引导比较状语从句.与 than 引导的比较状语从句类似,有时从句用部分倒装.
例如： She took as much responsibility as her husband did.
4） as 引导表示强调意义的特殊比较句型.
－ as … as anything; as … as can be; as …as one can “极其…… , 到了最……的程度”
例如：He is as naughty as anything .
－ as … as one can; as … as permit; as best one can
“尽可能”
例如：He began to run, as fast as he could.
－as 引导类比从句,与 so 连用.表示“正如……所以……”
例如：As you brew, so must you drink.
－as 引导比例从句,与 what 用法相同.
例如：Books are to the mind as food is to the body。

as的句型和用法as是一个多功能的词，它可以作为连词、副词、介词、形容词、名词等词性使用。

下面将会详细介绍它的句型和用法。

1. 作为连词（conjunction）：1.1 表示原因：as可以引导原因状语从句，说明事件的原因，“由于”，“因为”。

例如：- As it was raining, we decided to stay at home.（由于下雨，我们决定待在家里。

）- He didn't go to the party as he was feeling sick.（由于他感到不舒服，他没有去参加派对。

）1.2 表示方式：as可以引导方式状语从句，表示某个行为或状态的方式，“如同”，“像”。

例如：- He worked as if he had never been tired.（他工作得好像从未疲倦过一样。

）- She spoke to me as though I were a child.（她对我说话的态度像对一个小孩子一样。

）1.3 表示时间：as可以引导时间状语从句，表示某个动作发生的时间，“当...时候”，“一边...一边”。

例如：- As I was walking home, I saw a shooting star.（当我走回家的时候，我看到了一颗流星。

）- As he was talking, I was listening attentively.（他一边说话，我一边专心听着。

）2. 作为副词（adverb）：2.1 表示程度：as可以用来修饰形容词或副词，表示程度，“同样地”，“一样”。

例如：- She is not as tall as her sister.（她不如她姐姐高。

）- He sings as beautifully as a professional.（他唱得像一个职业歌手一样动听。

）2.2 表示比较：as可以用来比较两个事物或人，“像...一样”，“如同”。

as在句首的用法
as是一个多功能的词汇，可以作为不同的词性和用法。

当它出现在句首时，通常有以下几种用法：
1. 引导比较从句
As和比较级连用，表示“像……一样”，例如：As he grows older, he becomes wiser.（随着他年龄的增长，他变得更加聪明。

）
2. 引导原因从句
As表示“因为”，引导原因从句，例如：As I was feeling tired, I decided to go to bed early.（因为我感到疲倦，我决定早点睡觉。

）
3. 引导方式从句
As表示“以……方式”，引导方式从句，例如：As she spoke, her voice shook with emotion.（她说话时，声音因为情感而颤抖。

）
4. 引导时间状语从句
As表示“当……的时候”，引导时间状语从句，例如：As I was walking home, I saw a shooting star.（当我走回家的时候，我看到了一颗流星。

）
5. 引导让步状语从句
As表示“尽管”，引导让步状语从句，例如：As difficult as it was, he refused to give up.（尽管很困难，他仍然拒绝放弃。

）总之，as在句首的用法多种多样，我们需要根据不同的语境和句子结构来理解它的具体含义。

有关as作连词的用法一．as引导状语从句as作为连词可以引导状语从句，表示时间、原因、方式、让步等。

1. 引导时间状语从句，意思是“当``````的时候”，同when/while,更强调“一边``````一边``````”。

表“随着``````”的意思时同with,但with是介词，不可以跟从句。

eg: I saw him as he was getting off the bus.He often listens to the music as he is doing his homework.As time goes by, his illness is getting worse.2. 引导原因状语从句，同since。

eg: We had better hurry as it is getting dark.As she has no car, she can’t get there easily.有关as作连词的用法一．二．as引导定语从句1. as引导限制性定语从句。

as作为关系代词可以引导限制性定语从句，通常与the same或such连用，构成the same ``````as和such``````as句型。

eg: I have never heard such stories as he tells.This is the same dictionary as I lost.有关as作连词的用法要用倒装结构。

可以把从句中表语、状语甚至谓语动词置于句首，如果是带有冠词的可数名词单数作表语，置于句首时应省去冠词。

eg: Young as he is, he knows a lot about history.Much as I like you, I will not marry you.Try as she might, Mary couldn’t get the door open.Boy as he is, he is very shy. (boy前省略冠词a)4. 引导方式状语从句，表示方式。

as翻译成正如引导什么从句
As翻译为正如时，引导定语从句；
1.As可以引导定语从句.有时可译为“正如”.此时,常常是as从句在前,主句在后。

2.As 还可引导原因状语从句,“因为,由于”。

3.As还可引导时间状语从句,“当...时”。

扩展资料
4.As还可引导方式状语从句,“按照”
5.As还可引导让步状语从句.“尽管”.但是注意,as引导方式状语从句时从句必须倒装.而且这种倒装和一般的倒装不一样.as从句的.倒装一般是把从句的表语或作状语的副词提到as之前,（如果表语是一个带有不定冠词a或an的单数名词,倒装后a或an必须省略)。

as引导的状语从句及其用法as引导的状语从句通常用来表示原因、方式、时间、比较等，常见于复合句中。

其基本结构为“as+主句”。

下面详细介绍其用法： 1. 表示原因例如：As I was too tired, I decided to go to bed early. (由于我太累了，我决定早点睡觉。

)2. 表示方式例如：He spoke as if he knew everything. (他说话的样子好像什么都知道。

)3. 表示时间例如：As soon as he arrived, he called me. (他一到就打电话给我。

)4. 表示比较例如：As big as it is, the new shopping mall is always crowded. (虽然这个新的购物中心很大，但总是很拥挤。

)5. 表示条件例如：As long as you work hard, you will succeed. (只要你努力工作，你就会成功。

)6. 表示让步例如：As busy as he is, he always finds time to exercise. (虽然他很忙，但他总是能找到时间锻炼身体。

)需要注意的是，as引导的状语从句与since引导的状语从句有时会混淆。

它们都可以表示原因，但as表示的是一个具体的原因，而since表示的是一个持续的原因。

例如：As I was tired, I decided to go to bed early. (由于我太累了，我决定早点睡觉。

)例如：Since I started working here, I have been very busy. (自从我来这里工作以来，我一直很忙。

)以上是as引导的状语从句的基本用法及注意事项。

希望对大家有所帮助。

as引导的状语从句及其用法
as引导的状语从句是英语中常见的一种从句结构，用来表达某种条件、原因、方式等。

它通常放在句首，后面接一个逗号，与主句之间构成一种关系。

常见的as引导的状语从句有以下几种用法： 1. 表示时间：As the sun rises, the birds begin to sing.（随着太阳升起，鸟儿开始唱歌。

）
2. 表示原因：As it was raining heavily, we decided to stay indoors.（由于雨下得很大，我们决定待在室内。

）
3. 表示方式：As he spoke, he gestured wildly with his hands.（他说话时，用手大力地挥舞着。

）
4. 表示条件：As long as you study hard, you will pass the exam.（只要你努力学习，你就能通过考试。

）
5. 表示比较：As big as the elephant is, it is not the largest animal in the world.（虽然象很大，但它并不是世界上最大的动物。

）
总之，as引导的状语从句可以在英语的写作和口语中发挥重要的作用，能够帮助我们更加准确地表达自己的意思，增强语言表达的能力。

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as的用法总结大全as可以在句子中充当不同成分，是英语语法中非常常见的成分之一。

那么你知道as的用法有哪些吗？下面小编给大家整理了as的用法总结,希望大家喜欢!● as的用法1、as做介词，意思是“作为”例句：French is known as the most beautiful language in the world.法语以世界上最美丽的语言著称。

2、as做连词，引导时间状语从句，意思是“当……的时候”例句：My mother was cooking fish as I arrived home.当我到家的时候，我妈妈正在做鱼。

3、as做连词，引导原因状语从句，意思是“因为”例句：As rain has fallen, the air is cooler.因为下过雨，所以空气比较凉爽。

4、as做连词，引导让步状语从句，意思是“虽然”例句：Young as he is, he has been one of the most famous painters in our country.虽然他还很年轻，但已经成为我们国家最有名的画家之一。

5、as做连词，引导方式状语从句，意思是“以……方式”例句：Do as the Romans do when in Rome.入乡随俗6、as做关系代词，引导定语从句例句：This is the same game as I played yesterday.这和我昨天玩的游戏一样。

as相关短语as well 也;同样地;还不如as well as 也;和…一样;不但…而且as one 一致的as soon ◎宁愿…，宁可… , ◎同样乐意，同样愿意(常用于 would，had 之后)[亦作as lief] , ◎同样高兴(或愿意) , ◎宁愿,宁可(与 would, had 连用)as soon as 一…就…as long as 只要;和…一样长as if 犹如，好似as much 也;同样多的as for 关于，至于as soon as possible 尽快as a whole 总的来说as far as adv. 至于，直到，远到;就…而言as of 自……起as though 好像;仿佛as being 就是;即像as early as 早在…的时候as usual 像往常一样;照例as good as 和…几乎一样，实际上等于…as per 按照，依据;如同as such 同样地;本身;就其本身而论● As 用法专练1.It is generally believed that teaching is ____ it is a science.A. much as an art asB. as much an art asC.an art as much asD.as much as an art2. _____ I admire David as a poet,I don’t like him as a man.A.Only ifB.If onlyC. As muchD.Much as3. ____ ,he talks a lot about his favourite singers after class.A.A quiet student as he may beB.Quiet student as he may beC.Quiet as he may be a studentD.As he may be a quiet student4.I wonder why you don’t do it as ____ and it’s the third time you have done so.A.told youB. be toldC. told toD. you told5.( 1) ___I explain on the phone,your request will be considered at the next meeting.(2)____ I explain on the phone is that your request will be considered at the next meeting.A. WhatB.WhenC.AfterD. As6.(1)That is ____ problem____can’t be worked out by anyof us .(2)That is ____problem____none of us can work it out.A.a such difficult , thatB.so difficult a ,thatC.such a difficult, asD.a so difficult ,as7.There were not so many jobs available ____ were asked for.A. thatB. whichC. whatD. as8.____ time went on,Einstine’theory_____ r ight.A. With, proved B As, be provedC.With, be provedD. As, proved9.He will surely finish the job on time ____ he’s left to do it in his own way.A.as ifB.even ifC.so long asD. so that10.Scientists generally agree that the earth’s climate will warm up over the next 50 to 100years____it has warmed in the 20,000 years since Ice Age.A.As long asB.as much asC.as long asD. as well as11.Do come to my party,and bring your sister____.A.as goodB.as a wholeC.as wellD.instead12.It’s useless trying t o argue with the sort of him.You might____ go and stand upon the beachand argue with the sea.A as wellB also C.as if D. as well as13.(1) We all passed the exam,but ___ him, he alone failed.(2) ____ running, learning English needs will.A. As/as withB. As/as toC.As/as forD.As/as if14.I thought things would get better, but ___ it is they were gettting worse.A before B.because C.as D.after15.All the gifts must be mailed immediately____ in time for Christmas.A in order to have received B.in order to receivedC.so as to be receivedD.so as to be receiving16(1)Look! The clouds are gathering. It looks as if it ______ (rain).(2)If you put a chopstick into water , it looks as if it _____(break)Answers:1-4 B D B C 5. DA 6.CB 7-10 D D C B11-12 C A 13.CA 14-15 C C16.1)is going to rain 2) were broken。

AS引导的方式状语从句是英语语法中常用的一种方式状语从句。

在这种从句中，AS是一个连词，引导了一个描述方式、方式、状态等的从句。

它通常用来表示一个行为是以什么方式进行的，或者说明一个情况的状态是怎么样的。

AS引导的方式状语从句与其他的方式状语从句（比如用LIKE或者IN THE WAY THAT引导的从句）不同，它通常用在复杂句中，作为主句或者从句的一部分。

以下是AS引导方式状语从句的用法和示例：用法一：AS + 形容词/副词+ 主语/谓语在这种情况下，AS引导的方式状语从句用来描述一个情况的状态或者一个动作的方式。

它通常放在主句的后面，例如：She looked at me as if she didn't believe what I was saying.她看着我，就好像不相信我说的话一样。

He drove as fast as he could to get to the hospital.他开车尽可能快地去医院。

She spoke to him as though he was a child.她跟他说话，就好像他是一个孩子一样。

用法二：AS + 名词+ 谓语在这种情况下，AS引导的方式状语从句用来描述一个动作或者情况的方式。

它通常放在主句的后面，例如：She writes poetry as she breathes.她写诗就像呼吸一样。

He played the guitar as though he was born to do it.他弹吉他，就好像天生就是这个样子。

She looked at the painting as an expert would.她看着画，就像专家一样。

用法三：AS IF/AS THOUGH + 从句在这种情况下，AS引导的方式状语从句用来描述一个情况的状态或者一个动作的方式。

它通常放在主句的后面，例如：She talked to him as if he was her best friend.她跟他说话，就像他是她最好的朋友一样。

as 引导的各种从句as 作为英语中一个非常活跃的词，其引导的从句在中学阶级较为多见，它们的种类应根据实际意义具体分析判定。

如下：一、as 充当连词，引导状语从句。

1. 引导时间状语从句，主句动作与从句动作同时发生，译为“当……的时候；一边……一边”。

如：As the students watched him quietly，he mixed the three together.当学生们静静地看着他的时候，他把这三种液体搅和在一起。

As the pupils walked along the lake，they sang happily.学生们沿着湖一边走，一边高兴地唱着。

2. 引导原因状语从句，从句所表达的原因是比较明显的，已为人们所知的。

如：As he did not know much English，he got out his dictionary and looked up the word “ cough ” .由于他英语懂得不多，就拿出字典来查“咳嗽”这个词。

As it was getting very late，we soon turned back.因为很晚了，我们很快就回来了。

3. 引导方式状语从句，此时as 可译为“如；像；按照”。

如：Remember，you must do everything as I do.记住，你们都要照我这样做。

When at Rome do as the Romans do.（谚语）入乡随俗。

I have changed it as you suggested.我已经按照你的建议把它改好了。

4. 引导让步状语从句，多用于书面语中，且须用部分倒装语序，即将从句的表语或状语等前置。

它比though 和although 引导的让步状语从句更有表现力，语气更强。

如：Poor as he was （＝Though he was poor ）he was honest.他虽然贫穷，但很诚实。

as作为介词时，用法和语义较单一，其含义为“作为”。

但是as作为连词词性时，其用法和功能较多，可以引导各类从句，as引导原因状语从句、时间状语从句、方式状语从句、让步状语从句和定语从句。

as的六种用法1、as做介词，意思是“作为”eg.French is known as the most beautiful language in theworld.法语以世界上最美丽的语言著称。

2、as做连词，引导时间状语从句，意思是“当……的时候”eg.My mother was cooking fish as I arrived home.当我到家的时候，我妈妈正在做鱼。

3、as做连词，引导原因状语从句，意思是“因为”eg.As rain has fallen, the air is cooler. 因为下过雨，所以空气比较凉爽。

4、as做连词，引导让步状语从句，意思是“虽然”eg.Young as he is, he has been one of the most famous painters in ourcountry. 虽然他还很年轻，但已经成为我们国家最有名的画家之一。

5、as做连词，引导方式状语从句，意思是“以……方式”eg.Do as the Romans do when in Rome. 入乡随俗6、as做关系代词，引导定语从句eg.This is the same game as I played yesterday.这和我昨天玩的游戏一样。

as引导定语从句as引导定语从句时，既可以引导限定性定语从句，又可以引导非限定性定语从句。

区分as引导定语从句和其它从句的关键特征是：as引导定语从句时在从句中做成分，通常做主语或宾语。

1、as引导限定性定语从句。

如从句所修饰的名词前有such、the same、as出现，后面的定语从句将由as引导，形成such...as，thesame...as，as…as这样的固定结构，译为“和……一样”。