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一、as作从属连词时，引导不同种类的状语从句。
（1）as引导时间状语从句时，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引导原因状语从句时，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, y ou’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引导比较状语从句时，有“as …as”、“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。
（A）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。
（B）表示同一个人（或物）在不同方面的比较。
例如：She is as kind as （she is ）honest.她既诚实又和蔼。
（4）as引导方式状语从句时，译作“按照；如同”。
as用法归纳一、as作连词的用法1. as...as的用法as...as意为"和……一样"，表示同级的比较。
使用时要注意第一个as为副词，第二个as为连词。
其基本结构为：as+ adj./ adv. +as。
例如：(1)This film is as interesting as that one. (2)Your pen writes as smoothly as mine.其否定式为not as/so +adj./ adv. +as。
例如：This dictionary is not as/so useful as you think.若有修饰成分，如twice, three times, half, a quarter等，则须置于第一个as之前。
例如：Your bag is twice as expensive as mine2. as用作连词引导时间状语从句as与when，while都是引导时间状语从句的从属连词，含义都是"当……的时候"。
但它们有区别：用when时，从句的动作可以与主句的动作同时发生，也可以先于主句的动作发生；用while时，从句的动作为一过程，主句动作与从句动作同时进行或在从句动作过程中发生；用as时，主句和从句的动作同时发生，具有延续的含义。
例如：(1)It was snowing when he arrived at the construction site.(2)He was watching TV while his mother was cooking.(3) You will grow wiser as you grow older.3. as用作连词引导原因状语从句as，because，since都可以表示因果关系，连接原因状语从句，含义是"因为，由于"，但它们有区别：because表示的语气最强；as一般放在句首，语气较弱，较口语化；since常常用在书面语中，表示多为对方已知的、或稍加分析便可得知的原因，有时可译作"既然"。
As用法全析1. as作连词引导时间状语从句，意为“一边……一边……”，“随着”,“当……时”，常表示主句和从句的动作同时发生。
例如：They had a pleasant chat as they walked in the garden. 他们一边在花园里散步，一边愉快地聊天。
As she grew older, Jenny came to realize how much her parents loved her.随着年龄的增长，珍妮逐渐意识到父母是多么爱她。
2. as作连词引导原因状语从句，意为“因为，由于”，尤其是原因已经明显时或者说话人认为原因很明显时，从句放在主句的前后均可。
例如：As the 5:30 train had left, we had to wait for another two hours.由于五点半的火车已经开走，我们不得不再等两个小时。
考例：Jenny was very sad over the loss of the photos she had shot at Canada, ________ this was a memory she especially treasured.(2006广东卷)A. asB. ifC. whenD. where3. as 作连词引导方式状语从句，意为“照……方式”。
例如：Tom rearranged the furniture as his wife asked.汤姆按照妻子的要求重新摆放了家具。
考例：——Who should be responsible for the accident?——The boss, not the workers. They just carried out the order ________.(2008福建卷)A. as toldB. as are toldC. as tellingD. as they told(注意：as told为as they were told的省略)4. as作连词引导让步状语从句，意为“尽管、虽然”，从句必须用倒装结构，通常将作表语的形容词、名词，作状语的副词，或者将情态动词之后的动词原形提到as之前。
As用法总结一、as作连词的用法1. as...as的用法as...as意为"和……一样"，表示同级的比较。
使用时要注意第一个as为副词，第二个as为连词。
其基本结构为：as+ adj./ adv. +as。
例如：(1)This film is as interesting as that one.(2)Your pen writes as smoothly as mine.其否定式为not as/so +adj./ adv. +as。
例如：This dictionary is not as/so useful as you think.若有修饰成分，如twice, three times, half, a quarter等，则须置于第一个as之前。
例如：Your bag is twice as expensive as mine.你的袋子比我的贵一倍。
几个关于as...as的常见句型：(1)as...as possiblePlease answer my question as soon as possible.(2)as...as usual/beforeShe looks as pretty as before.她看起来和以前一样漂亮。
(3)as long as... (引导条件状语从句)It took us as long as three years to carry out the plan.我们花了长达三年的时间才完成这项计划。
(4)as far asHe walked as far as the railway station yesterday evening.昨天傍晚，他一直散步到火车站。
(5)as well asShe cooks as well as her mother does.她烧菜烧得跟她母亲一样好。
一些带有as...as结构的常见短语归纳：as busy as a bee像蜜蜂一样忙碌as easy as ABC像ABC一样容易as deep as a well像井一样深as light as a feather像羽毛一样轻as soft as butter像黄油一样软as rich as a Jew像犹太人一样富裕2. as用作连词引导时间状语从句as与when，while都是引导时间状语从句的从属连词，含义都是"当……的时候"。
as的用法时态1.引言1.1 概述"as" 是一个常见且重要的单词，可以在不同的上下文中使用，并且在英语中有多种用法时态。
本篇文章将重点讨论"as" 在现在进行时和过去进行时中的用法时态。
在这两种时态中，“as”都可以用于表示同时或一段时间内正在发生的动作。
使用"as" 这个词的目的是为了更准确地描述事件的发生时间，尤其是在描述两个或多个同时进行的动作时。
通过使用"as"，读者可以清楚地了解每个动作是否同时发生，还是它们存在一定的时间间隔。
在本文的后续部分，将详细讨论"as" 用于表示现在进行时和过去进行时的具体用法。
同时，我们还将探讨一些可能的变化和展望。
通过深入了解和掌握"as" 的用法时态，我们能够更加准确地表达我们想要表达的意思，并且能够更好地理解别人的表达。
希望本文能够为读者提供清晰的解释和实用的例子，帮助读者在写作和交流中运用"as" 的用法时态。
接下来，我们将会详细探讨"as" 在现在进行时和过去进行时中的具体用法。
1.2文章结构1.2 文章结构本文将分为引言、正文和结论三个部分来讨论as的用法时态。
在引言部分，将对文章的主要内容进行概述，并介绍文章的结构和目的。
接着，在正文部分，将具体探讨as在表示现在进行时和过去进行时时的用法。
针对这两个时态，将逐一介绍as的用法以及相关的语法规则和例句。
最后，在结论部分将对as的用法时态进行总结，并对未来的发展和可能的应用进行展望。
通过这样的结构安排，读者能够清晰地了解as的用法时态，并对其在语言表达中的作用有更深入的认识。
1.3 目的在本篇文章中，我们的目的是探讨和分析as的用法时态。
as作为一个多功能的连词，可以用于表示现在进行时和过去进行时。
通过深入研究和解析as在不同时态中的使用方式，我们旨在帮助读者更好地理解其在句子中的作用和意义。
实例分析as的四种词性as从词类上讲,可以用介词、副词、连词、关系代词；从语法功能上讲,可以和它的宾语一起构成介词短语,可以引导状语从句、定语从句,也可以修饰形容词或其它副词；另外还可以用在很多习语中;一、as用作介词preposition1. 作为,以……的身份；担任as a mediator 担任仲裁人She works as an interpreter in that company.她在该公司里担任翻译员;2. 当作didn't think much of him as a painter.她对他作为一位画家评价不高;3. 像,跟┅相似；如同,相同this issue they thought as one. 在这个议题上他们的想法一致;The old woman was dressed as a young lady.这位老妇人打扮得像一位年轻人;二、as用作副词adverb1. 跟……一样地,同样地；在相同的范围或程度; 相等地child sang as sweetly a nightingale. 那孩子歌唱得跟夜莺一样甜美;Sam is as rich as Alexander.山姆像亚历山大一样富有;2. 如同；例如animals as foxes and squirrels have bushy tails.有些动物,如狐和松鼠,有蓬松的尾巴;large carnivores, as the bear or lion 大的食肉动物, 例如熊或狮子3 在一个特定的关系或形式下考量definition as distinguished from the second one. 这个定义跟第二个比较起来是有区别的;三、as用作连词conjunction1. 常用在so或as之後作为相关连接词相同的程度或数量,像……一样；依照,像are as sweet as sugar. 你跟糖一样的甜;The situation is not so bad as you suggest. 情况不像你想像的那麽糟;You ought to do as Paul tells you.你应按照保罗吩咐的做;The work is not so difficult as you imagine.这工作不像你想像的那么困难;Think as I think. 依照我想的方式来想;2. 当……时；同时,当时she left the room she remembered that book.她离开房间时想起了那本书;Slipped on the ice as I ran home. 我跑回家的时候, 我在冰上滑了一跤;3. 随着the sun rose the fog dispersed.太阳一出来,雾随之消失;4. 因为didn't know what to do as we were just visiting there.我们不知道该怎么办,因为当时我们仅仅在那里作访问; Went to bed early, as I was exhausted. 因为非常疲累我很早就上床睡觉;5. 虽然as he was, he sat up late.他虽然疲倦,可仍然很晚才睡;Great as the author was, he proved a bad model.虽然这名作家很伟大,不过他树立了一个不好的榜样; Ridiculous as it seems, the tale is true. 虽然荒谬,这个故事却是真实的;6. 结果was so foolish as to lie. 他这麽傻, 才会傻到要说谎;7. 配合……来讲; 以……方式来看hotel is quite comfortable as such establishments go.就设备来看, 这旅馆算是非常舒适的了;The sun is hot,as everyone knows. 大家都知道太阳很热;8. <口语>相当於 thatdon't know as I can answer your question. 我不晓得能不能回答你的问题四、as用作关系代词1. 与such,the same,as等连用,引导关系从句与……相同的事物或人has earned as much money as I have.他赚的钱和我赚的一样多;She felt just the same as he did.她和他的感受相同;There is a general rise in prices such as occurred in the late 60's.物价普遍上涨,跟六十年代末一样;I received the same grade as you did. 我跟你得到同样的分数;Those as want to can come with me. 要来的可以跟我来2. 引导从句,对前述内容作补充本情况,该事实has married again, as was expected.她已再婚,这是意料中的事;We are tired, as anyone can see.我们累了,这是有目共睹的;五、带as的一些习语as follows 如下as long as 只要；在……的时候as mentioned above 如上所述as much as 到……程度;差不多,实际上;虽然,即使as noted above 如上面所看到的那样, 上面已经看到as opposed to 完全不同, 截然相反, 反对, 对照as previously seen 如前面所见到的那样, 前面已经见到as soon as 一……就……as such 像这样的;本身,就这一点而论as the name implies 顾名思义as well 也,又,同样as well as 既……又……,不仅……而且……,以及,除……外A as well asB 不仅有乙而且有甲as firm as a rock 稳如磐石,毫不动摇as for 关于,至于,就……而言as is 照原样,无担保,不保修；<口语> 原样the samovar as is from an antique dealer从古董商那儿买到原样的俄国茶壶as yet 迄今,到目前as it is 事实上,实际上,既然如此,像现在这样as it were 可以说,可谓;似乎、好像as if 似乎,好像,仿佛as of 在……时候,从……时候起,到……时候止,直到……as regards 关于as to 根据,按照,依照;关于,至于,就……而言as in the case with 与的情况一样as indicated in 如所示as indicated above 如上面所指出as a consequence 由于……,结果as a consequence of 由于, 因为as a result 因此,结果brave as a lion 像狮子一般勇敢as a result of 作为……的结果,由于as a rule 通常,一般说来as a whole 作为一个整体,总而言之,总的说来,整体上,整个as seen from without从外面看来。
一、as关系代词作为关系代词as引导定语从句，可以单独使用，也可以与其他词连用。
1.用于the same...as结构中This is the same book as I read last week.这本书和我上周读的那本是一样的。
2.用于such...as结构中，such…为先行词I don’t like such books as he recommends.我不喜欢他推荐的那些书。
Take such (things) as you need.你需要什么就拿什么。
意思：“凡是…的人或事”，“所有…的人或事”。
下同，You may choose such as you prefer.你可选择自己想要的东西。
Such （people）as have knowledge and skill will not want to work.有知识和技能的人不愁没有工作。
3.用于"so +adj. + a/an + n. (单数) + as "结构中I am not so strong a man as I was.我已经没有从前那么强壮了。
He is not such a fool as he looks.他并不像他看起来那么傻。
Such men as he (is) are rare now.现在像他这样的人很少了4. as单独引导非限定性定语从句代替它前后的先行词Antecedent(即句子或词或短语)，意思是“这一点”，可摆放在句中、句首、句末；例如：She is late, as is often the case.她迟到了，这是经常的事。
(先行句)To shut your eyes to facts, as many of you do, is foolish.对事实视而不见--你们好多人都是如此的愚蠢。
(先行短语)We had hoped to give you a chance such as nobody else ever had.我们本来希望给你一个别人从未有过的机会。
As的用法as可以作连词、介词及关系代词和副词。
现将其用法小结如下: （一）、as作连词的用法:1.作“在……期间，当……的时候”引导时间状语从句.注意与when、while的用法区别。
①下列情形时,只用as, 而不用when或while。
1)用于表示同一个人的两种动作交替进行,指一边……一边. 如: The girl sings as she goes to school.He looked behind occasionally as he went forward in the forest.2)表示两个同步发生的动作或行为,意思是随着……的发生, 如: As time went on / by, she became more and more beautiful.As children get older, they become more and more interested in everything.3)表示两个短暂行为或事情几乎同时发生.如:I watched her as she read the book.I thought of it just as you opened your mouth.Just as the flying worm hit her face, she gave a loud cry.4)接在名词后面表示某一个年龄段时.如:As a young man, he was active in sports.②when作"当……的时候"解,可以指较短的(一点)时间,也可指一段时间。
如:When I was at college, I could speak several foreign languages. When the clock struck twelve, I had slept for 2 hours.③while常表示一段较长的时间或一个过程,强调主句谓语动词与从句谓语动词同时发生。
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