As引导的各种从句归纳
as作连词的用法归纳总结
as作连词的用法归纳总结一、as作为连词的基本用法作为一个连词，as在句子中具有多种用法。
它可以引导原因状语从句、方式状语从句、时间状语从句以及让步状语从句等。
下面将对这些不同用法进行详细的归纳总结。
1. 引导原因状语从句当as引导原因状语从句时，表示结果发生的原因或理由。
常与such/as such、especially/as especially、particularly/as particularly等词搭配使用。
例如：- I couldn't sleep as the room was too noisy.- As it was raining heavily, we decided to stay home.2. 引导方式状语从句在此情况下，as引导的方式状语从句表达某个动作或状态发生的方式或方式特点。
例如：- She treated me as if I were a stranger.- He ran as fast as he could to catch the bus.3. 引导时间状语从句当as引导时间状语从句时，意味着两个动作同时发生。
例如：- As she was cooking dinner, her phone rang.- As the game started, the crowd cheered loudly.4. 引导让步状语从句在这种情况下，as除了表达对比之外，还表示两个行为具有相似性质但存在明显差异。
例如：- Rich as he is, he is not happy.- Clever as she is, she still made a mistake.二、as作为连词的扩展用法除了上述基本用法外，as还有其他一些特殊的用法。
下面将介绍其中几种常见的用法。
1. 表示"像...一样"在这种情况下，as可以引导一个比较状语从句，表示两个事物之间的相似性。
As引导从句常见用法归纳
As引导从句常见用法归纳下面是店铺为同学们归纳了As引导从句常见用法，希望大家学以致用!一、表示比较，意为“象……一样，正如，如同”She’s very tall, as is her mother. 她个子很高，和她母亲一样。
二、表示方式、程度、情况。
意即“照……方式、如同、象”They did as I had asked. 他们是按照我的要求做的。
三、表示时间，意为“当……时候”，“一边……一边”“随着……”As he grow older he gained in confidence. 随着年龄的增长他的信心增强了。
四、表示原因，意为“因为，由于”As you were out, I left a message. 你不在，所以我留下了一张字条。
五、表示让步，意为“尽管;虽然;即使”(表语一般放在本从句之首;如有可数名词单数，前面也不要冠词)Child as he is ,he can tell black from white. 尽管他是个孩子，但他能够分辨黑白。
Happy as they were, there was something missing. 尽管他们很快乐，但总缺少点什么。
六、引导定语从句1)as引导非限制性定语从句，常指主句所表达的整个事情，可置句首、句中、句末，常见 as we all know,as I see it 照我看来，as it appears to me 依我看来。
As we all know, oceans cover more than 70 percent of the earth.正如我们所知道的，海洋占地球面积70%以上。
2)as引导限制性定语从句From every corner of the island little people came to see the"Man Mountain~as they called Gulliver. 小人们从海岛的各个角落来看他们叫做‘人山’的格利佛。
as引导的定语从句
as引导的定语从句
1. as soon as（一…就…）：引导一个时间性定语从句。
例如：I will call you as soon as I finish my work.（我一做完工作就给你打电话。
）2. as long as（只要）：引导一个条件性定语从句。
例如：You can borrow my car as long as you promise to drive carefully.（只要你答应小心驾驶，你可以借用我的车。
）
3. as far as（就…而言，就…而论）：引导一个程度或范围的定语从句。
例如：As far as I know, he is still living in New York.（就我所知，他仍然住在纽约。
）
4. as well as（和…一样；不仅…而且）：引导一个并列关系的定语从句。
例如：He speaks French as well as English.（他不仅会说英语，还会说法语。
）
5. as if / as though（好像；仿佛）：引导一个比拟关系的定语从句。
例如：She looks as if she hasn't slept for days.（她看上去好像已经好几天没有睡觉了。
）。
as引导的五种状语从句
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。
(完整版)As引导从句归纳总结
As引导从句归纳总结一、as引导定语从句一）as引导限制性定语从句主要结构有：the same…asas…assuch…asso…as主句中出现the same, as, such, so修饰先行词，需选择as做关系代词在定语从句中做主语或宾语。
1. It’s the same person as we wanted to find yesterday .我们昨天要找的是同一个人。
2. Such girls as he knows are good at English .他所认识的女孩都擅长英语。
3. Do you have such books as we like ?你有我们喜欢那种书吗？4. She will marry as healthy a man as she can find .她将嫁给她能找到的任何一个有钱人。
5. There is so warm a house as we want to live in .这里有如此暖和的房子，我们都想住在里面。
6. He has so difficult a problem , as none of us can solve .他有如此难的一个问题，我们没有人能解决。
二）引导非限制性定语从句1. as引导非限制性定语从句，指代整个主句内容，从句可置于句首，句中或句尾1) As everyone knows ,China is a beautiful country with a long history .每个人都知道，中国是一个有着悠久历史的美丽国家。
2) The earth , as we know , moves round the sun .地球，我们都知道，围着太阳转。
3) Tom works hard and is willing to help others, as we all know.汤母工作努力，并且乐于助人，这一点我们都知道。
as的用法归纳
as的用法归纳
“as”是一个英语连词，具有多种用法。
以下是“as”的用法归纳：
1、引导时间状语从句：as表示“当……时候”，“随着……”，“一经……就……”，强调主句和从句中的动作或状态同时发生或进行。
例句：As time goes by, I grow more and more confident. 随着时间的推移，我变得越来越自信。
2、引导原因状语从句：as表示“因为”，与because相比，语气较轻。
例句：As it was getting dark, we decided to stay in the hotel. 因为天色渐渐暗了，我们决定在旅馆里待着。
3、引导方式状语从句：as表示“以……方式”，“像……一样”。
例句：She looks at the world as if she were the only person in the world. 她看待世界的方式就像她是世界上唯一的人一样。
4、引导让步状语从句：as表示“尽管”，“虽然”。
例句：Young as he is, he knows a lot. 尽管他很年轻，但他知道很多事情。
5、引导比较状语从句：as表示“与……一样”，“像……一样”。
例句：He is as tall as his father. 他和他父亲一样高。
6、作为介词：as还可以作为介词，表示“作为”，“以……身份”。
例句：He works as a teacher. 他作为一名教师工作。
综上所述，“as”是一个非常灵活的连词，具有多种用法。
掌握其用法可以更准确地表达思想和意义。
as引导的五种状语从句
as作从属连词用时,可以引导五种状语从句。
现归纳如下：1. as表示“当……的时候”,引导时间状语从句,多强调主句和从句中的动作或状态同时发生,从句可放在主句前,也可放在主句后。
例如：As I waited at the stop, I heard a big noise. 当我在车站等车的时候,我听到一个很大的声响。
She rose up as he entered. 当他进来时,她站了起来。
2. as表示“因为”、“由于”,引导原因状语从句,其语气不如because强,通常为附加说明的理由,且是已知晓的原因,主句与从句没有逻辑上的因果关系。
例如：As she was not well, I went there alone. 因为她身体不好,所以我独自到那里去了。
As he is a tailor, he knows what to do with this material. 由于他是个裁缝,他知道怎样利用这块布料。
3. as表示“虽然……但是……”,引导让步状语从句,从句通常用倒装语序,把从句的表语、状语或动词原形放在as前面,可以用though替代。
例如：Child as he is, he knows a lot. 虽然他是个孩子,但他知道的东西很多。
Hard as it was raining, they went on working in the field. 虽然天下大雨,但他们继续在田地里干活。
4. as表示“按照”、“依照”、“像”,引导方式状语从句,从句置于主句之后。
例如：You should do as the teacher tells you.你应当依照老师所说的去做。
The absence of air also explains why the stars do not seem to twinkle in space as they do from the earth. 空气的不存在,也说明了为什么在空中星星看来并不闪烁,而不像从地球上看的那样。
as 引导的各种从句
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作随着引导什么从句
as作随着引导什么从句
as引导的从句有定语从句、时间状语从句、方式状语从句、原因状语从句、让步状语从句。
as：
prep.像;如同;作为;当作。
adv.(比较时用)像…一样，如同;(指事情以同样的方式发生)和…一样。
conj.当…时;随着;照…方式;因为;由于。
扩展资料
You need to be able to work as part of a team.
你必须能作为团队的一员去工作。
She used her family's history as a base for her novel.
她以她的家族史作为小说的素材。
My new job is much the same as the old one.
我的新工作和旧工作差不多。
Take as much time as you like.
你想花多少时间就花多少时间。
Research will be needed as a preliminary to taking a decision.
作出决定之前需要进行研究。
盘点as引导的六种从句
as表⽰“按照”，“以……⽅式”，“像……⼀样”，“正如”。
例：Do as the Romans do when in Rome. ⼊乡随俗 注：as在引导⽅式状语从句时，还常出现在⼀个固定的类⽐结构中：(just) as …, so…。
这⼀句型表⽰类⽐，基本含义是“正如……，所以……”。
例：Just as virtue is its own reward, so is vice its own punishment. 善有善报，恶有恶报。
五、as引导让步状语从句 as可以表⽰“尽管”，“虽然”，引导让步状语从句，但必须构成倒装。
让步状语从句倒装规则有两类： 1、形容词/副词/分词/名词(⽆冠词)/介词短语等 as 主语谓语动词，主句。
例1：Much as I like you, I couldn’t live with you. 我尽管很喜欢你，却不能和你在⼀起⽣活。
例2：Child as he is, he knows to help others. 尽管他是个孩⼦，他懂得帮助别⼈。
2、动词原形 as 主语助动词(may/might, will/would, can/could, do/does/did)，主句。
例：Try as we may, we cannot sense directly the television signal sent out from the broadcast station. 尽管我们费了很⼤的劲，也⽆法直接觉察发射台发出的电视信号。
六、as引导⽐较状语从句 as引导⽐较状语从句，其基本结构是as…as。
前⼀个as是副词，后⼀个as是⽐较状语从句的连词。
否定结构为not so much … as …。
例1：Small as it is, the ant is as much a creature as are all other animals on the earth. 尽管蚂蚁很⼩，但是它同地球上的任何其他动物⼀样，也是⼀种动物。
高中英语as引导从句用法全归纳
as的用法灵活，词义繁多，特别是在复合句中更能体现其用法的多样性和灵活性，但如果同学们能正确掌握as的高考资源网词性和词义，是不难掌握其用法的。
一、as用作关系代词引导定语从句1. as 引导非限制性定语从句，一般不指代某个具体的名词或代词，而是代表整个主句或主句的一部分。
这种从句可放在主句之前，也可以放在主句之后，有时还可以放在主句的中间。
如：As is reported in the newspapers, talks between the two countries are making progress. 正如在报纸上所报道的，两国间的谈判有所进展。
Grammar is not a set of dead rules, as has been said above. 如上所说，语法不是一套死条文。
Spiders are not insects, as many people think, nor even nearly related to them. 蜘蛛不是昆虫，尽管许多人都这样认为，它甚至与昆虫几乎没有联系。
2. as 引导限制性定语从句，主要用于the same…as（与……相同），such…as（像……一样），as…as（与……一样）。
如：She knew he felt just the same as she did. 她知道他的感受和她一样。
Such a man with a good temper as Mr. Li is is easy to get along with. 像李先生这样好脾气的人是容易相处的。
He smokes as expensive a cigarette as he can afford. 他抽一种他买得起的最贵的烟。
二、as作为从属连词引导时间状语从句表示“当……的时候”或“一边……一边”，强调主句的动作和从句的动作同时发生。
如：I saw him as he was getting off the bus. 当他下公共汽车的时候我看见了他。
(完整版)as引导的各种从句
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引导的七种从句
as引导的七种从句as引导的七种从句As引导的从句在英语中使用非常广泛。
它可以引导时间、原因、结果、方式、条件、让步和比较等不同类型的从句。
下面将详细介绍as引导的七种从句。
1. 时间从句：as引导的时间从句表示两个事件同时发生或者一个事件发生在另一个事件之后。
例如：'As I was leaving the house, it started to rain.'(当我离开房子的时候，开始下雨。
)2. 原因从句：as引导的原因从句表示某个事件的原因。
例如：'As he was tired, he decided to go to bed early.'(因为他累了，他决定早点上床睡觉。
)3. 结果从句：as引导的结果从句表示某个事件的结果。
例如：'He failed the exam as he didn't study enough.'(他因为学习不够而考试不及格。
)4. 方式从句：as引导的方式从句表示某个事件的方式或者方法。
例如：'She cooked the dinner as her mother had taught her.'(她做晚饭的方式是按照她妈妈教的那样。
)5. 条件从句：as引导的条件从句表示某个事件发生的条件。
例如：'As long as you study hard, you will pass theexam.'(只要你努力学习，你就能通过考试。
)6. 让步从句：as引导的让步从句表示尽管某个条件成立，但是结果仍然如此。
例如：'As difficult as the task was, hemanaged to complete it.'(尽管任务很困难，但他还是完成了。
)7. 比较从句：as引导的比较从句表示两个人或事物之间的比较。
例如：'She is not as tall as her sister.'(她不如她姐姐高。
as引导的各种从句归纳
as引导的各种从句归纳1. 哎呀呀，as 引导时间从句的时候，就像我们排队等车一样，“As I was waiting for the bus, I saw an old friend.”（当我在等公交车时，我看到了一位老朋友。
）你说是不是很形象呀？2. 嘿，as 引导原因从句呀，那简直就是在解释为啥会发生某件事呢，比如“As it was raining, we decided to stay at home.”（因为下雨了，我们决定待在家里。
）这不是很容易理解嘛！3. 哇塞，as 引导方式从句的时候呀，就好像在告诉你做事的方法，“Do as I say.”（照我说的做。
）是不是很直接明了呢？4. 哟呵，as 引导让步从句，那可有点厉害啦，“Poor as he is, he is happy.”（尽管他穷，但他很快乐。
）这不是很神奇吗？5. 嘿呀，as 引导比较从句呢，就像是在比较两个东西，“He is as tall as his father.”（他和他父亲一样高。
）是不是很容易感受到呀？6. 哎呀，as 引导定语从句的时候呀，就像给一个东西加上了特别的描述，“Such people as you describe are rare.”（像你描述的那样的人很少。
）这不是很有趣吗？7. 哇哦，as 引导条件从句，那就是在设定一个前提呢，“As long as you work hard, you will succeed.”（只要你努力工作，你就会成功。
）是不是给人很大的动力呀？8. 哈哈，as 引导结果从句，就像是事情发展的一个结果展示，“He worked hard, as a result, he passed the exam.”（他努力学习，结果，他通过了考试。
）是不是很清晰呀？9. 咦，as 引导目的从句呢，就好像是为了达到某个目标，“I got up early as I wanted to catch the first bus.”（我早起是因为我想赶上第一班车。
as引导的五种状语从句
as作从属连词用时,可以引导五种状语从句。
现归纳如下：1. as表示“当……的时候”,引导时间状语从句,多强调主句和从句中的动作或状态同时发生,从句可放在主句前,也可放在主句后。
例如：As I waited at the stop, I heard a big noise. 当我在车站等车的时候,我听到一个很大的声响。
She rose up as he entered. 当他进来时,她站了起来。
2. as表示“因为”、“由于”,引导原因状语从句,其语气不如because强,通常为附加说明的理由,且是已知晓的原因,主句与从句没有逻辑上的因果关系。
例如：As she was not well, I went there alone. 因为她身体不好,所以我独自到那里去了。
As he is a tailor, he knows what to do with this material. 由于他是个裁缝,他知道怎样利用这块布料。
3. as表示“虽然……但是……”,引导让步状语从句,从句通常用倒装语序,把从句的表语、状语或动词原形放在as前面,可以用though替代。
例如：Child as he is, he knows a lot. 虽然他是个孩子,但他知道的东西很多。
Hard as it was raining, they went on working in the field. 虽然天下大雨,但他们继续在田地里干活。
4. as表示“按照”、“依照”、“像”,引导方式状语从句,从句置于主句之后。
例如：You should do as the teacher tells you.你应当依照老师所说的去做。
The absence of air also explains why the stars do not seem to twinkle in space as they do from the earth. 空气的不存在,也说明了为什么在空中星星看来并不闪烁,而不像从地球上看的那样。
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A s引导的各种从句归纳-标准化文件发布号：（9556-EUATWK-MWUB-WUNN-INNUL-DDQTY-KIIAs引导的从句一、As引导让步状语从句为了帮助同学们全面掌握让步状语从句的倒装用法，本文将这类语法现象归纳为以下五种句型：1、名词+ as / though +主语 +动词King as he was，he was unhappy. 他虽是国王，但他并不幸福。
Child as he is，he knows to help other. 他虽是个孩子，却知道帮助别人。
【说明】其中的动词通常为连系动词，也就是说位于句首的名词是其后连系动词的表语。
另外，要特别注意位于句首的名词前习惯上不用冠词，即使其前有形容词修饰也不用冠词。
比较：Boy as ［though］ he is， he likes to play with girls.=Though he is a boy，he likes to play with girls. 他虽是男孩，却喜欢与女孩子玩。
Strong man as ［though］ he is，General Botha has been severely put to the test during the past few weeks.= Though he is a strong man， General Botha has been severely put to the test during the past few weeks. 波赛将军虽然坚强，但在过去的数周里也受到了严峻的考验。
2、形容词+ as / though + 主语 + 动词Successful as he is，he is not proud. 他虽然成功，但不骄傲。
Improbable as it seems，it’s true. 虽然看起来不太可能，但却是真的。
Stupid as it sounds，I was so in love with her that I believed her. 尽管听起来很愚蠢，我是如此爱她竟然相信了她的话。
Patient as he was，he didn’t like waiting that long. 他虽说有耐心，也不愿等这么长。
Beautiful though the necklace was，we thought it was over-priced. 那条项链虽然很漂亮，我们认为价钱太高。
【说明】其中的动词也通常为连系动词，也就是说位于句首的形容词是其后连系动词的表语。
3、副词+ as / though + 主语 + 动词Much as I like Paris，I couldn’t live there. 尽管我喜欢巴黎，但我不能住在那里。
Hard though they tried，they couldn’t make her change her mind. 尽管他们做了很大努力，却没法让她改变主意。
Fast as you read，you can’t finish the book in two days. 尽管你读得很快，你总不能在两天之内就读完这本书。
He was unable to make much progress，hard as he tried. 尽管他做了努力，却未能取得很大进步。
【说明】有的词典将 much as 作为习语看待，认为它是一个用以引导让步状语从句的复合连词。
再如：Much as I admire him as a writer，I do not like him as a man. 他作为一名作家我很佩服他，但我却不喜欢他这个人。
Much as I like you，I couldn’t live with you. 我尽管很喜欢你，却不能和你在一起生活。
4、动词原形+ as / though + 主语 + 动词Object as you may，I’ll go.纵使你反对，我也要去。
Try as he might，he couldn’t solve the problem. 尽管他想方设法，却未解决这个问题。
Search as they would，they would find nobody in the house. 无论怎样搜查，他们在房子里仍然没有找到一个人。
Dislike him as we may，we must acknowledge his greatness. 尽管我们不喜欢他，但必须承认他的伟大。
Lose money as I did，we got a lot of experience. 钱虽然丢了，我们却得到了许多经验。
Fail in the election as he did，he became famous for his fiery speech against slavery. 尽管落选了，但他却以其反对奴隶制的激烈演说而出了名。
【说明】主语后的动词通常为 may，might，would，did 等情态动词或助动词(若表示情态意义，则选用情态动词；若陈述事实，则用 did，do 等助动词)。
5、分词+ as / though + 主语 + 动词Raining hard as it is，I’m going ou t for a walk. 虽然正在下着大雨，我还是要出去散步。
Surrounded as we were by the enemy，we managed to march forward. 虽然我们被敌人包围着，但我们还是设法前进了。
Munching the apple as he was，he had got an eye for all John’s movements. 他尽管在一个劲地嚼着苹果，但仍警惕着约翰的一举一动。
6、补充说明1）这类倒装的让步状语从句可用as， though 来引导，不能用 although 来引导；但是，未倒装的让步状语从句却可用though， although来引导，而不能用 as 来引导。
也就是说，although引导让步状语从句时不能倒装，as引导让步状语从句时必须倒装，而 though引导让步状语从句时可以倒装也可以不倒装。
如：虽然很晚了，但我们还是继续工作。
正：Late as ［though］ it was，we still went on working.正：Though it was late，we still went on working.误：Late although it was，we still went on working .误：As it was late，we still went on working.2）上面提到的倒装结构有时也可用来表示原因，区别的办法主要看句子的内容：让步从句的内容大多数与主句在意义上相反，而原因从句则与主句之间有因果关系。
比较：Tired as he was，he sat up late studying at night. 昨晚他虽然很疲倦了，但还是学习到很晚才睡。
(表让步)Tired as he was，he went to bed early. 因为很累，所以他睡得很早。
(表原因)Young as he was，he was equal to the task. 他虽年轻，却能胜任这项工作。
(表让步)Young as he was，he was not equal to the task. 他因为年轻，所以不能胜任这项工作。
(表原因)3）在美国英语中，人们通常用 as...as 引导让步状语从句。
如：Cold as it was， we went out.=As cold as it was，we went out. 尽管天气冷，我们还是出去了。
Successful as he is， he is not proud.=As successful as he is， he is not proud. 他虽成功了，但不骄傲。
二、as 引导定语从句as 的用法:(as 引导定语从句, 在定语从句中作主语、宾语、表语)(一) 如为限制性的，多用于the same …a s ; the same as；such …as …; as many/much as；so …as等结构中。
如：1. I have the same book as you (have). 我有一本和你的一样的书。
Her attitude to him was quite the same as it had always been. (关系代词as和指示代词same连用, 在从句中用作表语, 先行词是same.)2.---Why didn't you mention that in face of the police just now?--- I thought it was such a minor detail as was hardly worth mentioning.We will only discuss such problems as have something to do with our own interests.Don't do such things as you are not sure about.There is no such place as you dream of in all this world.比较：I live in the same house that he used to live in. I'm wearing the same shirt as you wore yesterday.比较：Here is so big a stone as no one can lift. （定语从句）Here is so big a stone that no one can lift it.（结果状语从句）(二) 如为非限制性的，多单独引导一个定语从句，这种定语从句可置于句首，句中或句尾，译为"正如，这一点"。
（动词常为know, see, expect, point out, etc.）1. As we all know, smoking is harmful to one's health . (as 作宾语)=As is known to all, smoking is harmful to one's health . （as 作主语）=It's known to all that smoking is harmful to one's health .或:Smoking is harmful to one's health , as we all know .（as 作宾语）或: Smoking, as we all know, is harmful to one' health.2.He was a foreigner, as I knew from his accent. (宾语, 先行词是前面整个句子)当先行词被the same所修饰时，关系词既可以用as，也可以用that。