as/ ?z; ?z; strong form ??oèˉ???ǒ z; ?z/
as【prep】
so as to appear to be (sb) 好像（某人）: dressed as a policeman 打扮得像个警察* They
entered the building disguised as cleaners. 他们化装成清洁工人的模样进入大楼.
having the function or character of (sb) 有（某人）的身分或特性; 作为; 当作: a job as a
packer 包装者的工作* work as a courier 当导游* I'm speaking as your employer. 我以雇主的身分和你说话. * Treat me as a friend. 把我当作朋友. * accept sb as an equal 把某人视为同等的人* I respect him as a writer and as a man. 我尊重他这位作家, 也尊重他这个人. =>Usage 见所附用法.
(a) since sb is (sth) 因某人是（某身分）: As her private secretary he has access to all her
correspondence. 他是她的私人秘书, 能接触到她所有的信件. (b) when or while sb is (sth) 当某人是（某身分）时: As a child she was sent to six different schools. 她儿时前後上过六所学校.
> as【adv】
1as...as(used before advs and adjs in order to make a comparison 用於副词和形容词之前, 以构成比较句型) (a) (with the second as a prep第二个as用作介词) to the same extent...; equally...as 达到与...相同的程度; 与...等同: as tall as his father 和他父亲一样高* This dress is twice as expensive as that. 这件连衣裙比那件贵一倍. * He doesn't play half as well as his sister. 他演奏的水平不及他姐姐的一半. * I haven't known him as long as you. 我没有你认识他的时间长. * As likely as not (ie V ery probably), it will rain. 很有可能要下雨.
(b) (with the second as a conj第二个as用作连词) to the same extent...as; equally...as 同...一样达到某种程度; 与...等同: He looks as ill as he sounded on the phone. 他的样子和他在电话中说话的声音反映的病情是一样的. * His eyes aren't quite as blue as they look in the film. 他的眼睛不像在电影里见到的那麽蓝. * Run as fast as you can. 你能跑多快就跑多快. * He recited as much of the poem as he could remember. 他把诗中记得住的都背诵出来了. * She's as good an actress as she is a singer. 她当演员和当歌手都一样出色.
2not differently from; like 和...无不同; 像; 如: As before he remained unmoved. 他和以往一样无动於衷. * The `h' is silent as in `hour'. 在hour这个字中, h不发音.
As【conj 】
1during the time when; while 在...期间; 当...的时候: I watched her as she combed her hair. 她梳头的时候我一直看着她. * As he grew older he lost interest in everything except gardening. 他年纪越来越大, 除了喜欢园艺以外, 对一切都失去了兴趣.
2(usu placed at the beginning of the sentence 通常置於句首) since; because 由於; 因为: As you weren't there I left a message. 因为你不在那里, 我留了个信儿. * As she's been ill perhaps she'll need some help. 她由於生病可能需要些帮助.
(used after an adj or adv to introduce a clause of concession 用於形容词或副词之後, 引导
让步从句) although 尽管; 即使; 虽然: Young as I am, I already know what career I want to follow. 我虽然还小, 可是对要从事的职业已胸有成竹了. * T alented as he is, he is not yet ready to turn professional. 别看他有天分, 他还没把心用到专业上去. * 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. * Try as he would/might, he couldn't open the door. 他试过多次了, 却仍打不开那门.
in the way in which 以...方式: Do as I say and sit down. 照我说的, 坐下. * Leave the
table as it is, ie Do not disturb the things on it. 那桌子就那样吧（不要动上面的东西）. * Why
didn't you catch the last bus as I told you to?你怎麽不听我的话赶乘末班公共汽车呢?
a fact which 为...之事实: Cyprus, as you know, is an island in the Mediterranean. 如你所
知, 塞浦路斯是地中海的岛国. * The Beatles, as many of you are old enough to remember, came from Liverpool. 你们这样年纪的人大多还记得披头士乐队吧, 他们都是利物浦人.
(usu followed by be or do + subject 通常後接be或do +主语) and so too 也一样: She's
unusually tall, as are both her parents. 她特别高, 她父母也都那麽高. * He's a doctor, as was his wife before she had children. 他是医生, 他妻子生儿育女之前也当过医生. =>Usage 见所附用法.
(idm 习语) as against sth in contrast with sth 与...对照; 与...相比: She gets Saturdays
off in her new job as against working alternate weekends in her last one. 她新找的这份工作星期六放假, 而原来的那份工作周末是隔周放假. * We had twelve hours of sunshine yesterday, as against a forecast of continuous rain. 昨日有十二小时的晴天, 预报却说仍有雨. ,as and`when(a) (referring to an uncertain future event or action 指将来的某一未定的事或行动) when 到时候: We'll decide on our team as and when we qualify for the competition. 我们来决定自己的队到什麽时候才有资格参加比赛. Cf 参看if and when (if). (b) (infml 口) when possible; eventually 可能时; 终於; 最终: I'll tell you more as and when, ie as soon as I can. 有可能时我再多跟你说. as for sb/sth with regard to sb/sth 至於某人[某事物]: As for the hotel, it was very uncomfortable and miles from the sea. 至於旅馆呢, 非常不舒服, 而且离海边有好几里地. * As for you, you ought to be ashamed of yourself. 至於你, 你应该感到惭愧. as from; esp US as of(indicating the time or date from which sth starts 指某事物开始的时间或日期): As from next Monday you can use my office. 从下星期一起, 你可以使用我的办公室. * We shall have a new address as of 12 May. 我们自5月12日起将用新地址. as if; as though with the appearance of; apparently 好像; 似乎; 彷佛: He behaved as if nothing had happened. 他装作若无其事的样子. * As if unsure of where she was, she hesitated and looked round. 她彷佛茫然不知身在何处, 犹犹豫豫向四周打量. * He rubbed his eyes and yawned as though waking up after a long sleep. 他又揉眼睛又打哈欠, 好像睡了一大觉刚醒似的. ,as it`is taking present circumstances into account; as things are 照现状看; 看样子: We were hoping to have a holiday next week as it is, we may not be able to get away. 我们原来盼望着下星期放假--看样子走不了了. * I thought I might be transferred but as it is I shall have to look for a new job. 我以为我可能调动工作, 照目前情况看我得另找工作了. ,as it `were(used to comment on the speaker's own choice of words, which may give only an approximate meaning 用以评断自己用词是否恰当, 指词义接近而已): She seemed very relaxed in her natural setting as it were. 她似乎十分悠然自得--可以说是有自己随遇而安的天地. * He'd been watching the water rising for two hours preparing to meet his destiny, as it were before help arrived. 他在获救前的两小时中, 一直眼看着水在上涨--可谓准备听天由命了. as to sth; as regards sth with regard to sth; regarding sth 至於某事物; 提到某事物: As to correcting our homework, the teacher always makes us do it ourselves. 谈到批改我们的作业, 老师总是让我们自己改. * There are no special rules as regards what clothes you should wear. 至於应该穿什麽衣服, 并没有硬性规定. as yet =>yet. ,as you `were (used as an order to soldiers, etc to return to their previous positions, activities, etc 用作口令, 意为恢复到原来的位置﹑姿势﹑活动等).
as if 用法归纳 1． as if 从句的作用as if一般可由as though来代替。 引导表语从句，可在look, seem等系动词后。如： He looked as if / though he was ill. 他看起来好像生病了。It seems as if it is going to rain.看来好像要下雨了。 引导方式状语从句。如： I remember the whole thing as if / though it happened yesterday. The child talked to us as if he were a grown-up. 那个小孩跟我们讲话就像个大人一样。 2． as if 从句的语气及时态 ①as if从句用述语气。当说话者认为句子所述的是真实的或极有可能发生或存在的事实时， It sounds as if it is raining. 听起来像在下雨。 He talks as if he is drunk. 从他说话的样子来看他是醉了。 ②as if从句用虚拟语气。当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时， 表示与现在事实相反，谓语动词用一般过去式。如： You look as if you didn’t care. 你看上去好像并不在乎。When a pencil is partly in a glass of water, it looks as if it were broken． 表示与过去或与谈话时间为止发生的事实相反，谓语动词用
“had +过去分词”。如： He talked about the Great Wall as if he had been there before.说起长城来好像他以前去过那里。 The girl listened as if she had been turned to stone.女孩听着，一动也不动，像已经变成了石头。 表示与将来事实相反，谓语动词用“would / could / might + 动词原形”。如： He opened his mouth as if he would say something. 他开嘴好像要说什么。 It looks as if it might snow. 看来好像要下雪了。 3． as if从句中的省略。如果as if 引导的从句是“主语+系动词”结构，可省略主语和系动词等成份，这样as if 后就只剩下名词、不定式、形容词（短语）或动词-ing形式等。 He acts as if (he was) a fool. 他做事像个傻子。 He paused as if (he was going) to let the sad memory pass. The girl left the room hurriedly as if (she was) angry. 女孩匆忙离开房间，好像生气的样子。 From time to time, Jason turned round as if (he was) searching for someone. 词汇学习 1. A smelly gas came out of the cracks.
as的用法总结 as是英语考试中用得比较多的一个词，也是很多学生反映较难掌握的一个词。as的词性较多，用法也较复杂，因此掌握该词会对英语学习很有帮助。下面笔者就对as的用法作一个简单的归纳。 一、as作为从属连词，可以引导下列从句： 1、as引导时间状语从句，意为“正当……的时候”、“一面……一面……”、“随着……”，从句可放主句之前或主句之后。 As I was coming here, I met your brother. As he walked on, he felt himself getting more and more tired. 【知识拓展】：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： It was snowing when he arrived at the construction site.他到达工地时，天正在下雪。 He was watching TV while his mother was cooking.他母亲做饭时他在看电视。 You will grow wiser as you grow older.你会随着年龄的增长而越来越聪明。 2、as引导原因状语从句，意为“由于”大多位于主句之前，偶尔在前或后。 As this question is of great importance, we will discuss it once again. Water, as it occurs in nature, is never very pure. We couldn‘t send the children to school as life was very hard in those days.【知识拓展】：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”。例如： He will succeed because he is in earnest.他一定会成功，因为他很认真。 Since you are so sure of it he’ll believe you.既然你对此如此有把握，他会相信你的。 As rain has fallen, the air is cooler.因为下过雨，空气比较清爽。 3、方式状语从句，意为“如同”、“按照……的方式、样子、办法”。As 从句总跟在主句之后。 You must try to hold the tool as I do. 象我那样拿住工具。 Leave things as they are. 让那些东西保持原样。 3、as引导让步状语从句，意为“虽然”，多在主句之前，且多用倒装。（应将从句主要成分的形容词、副词、原形动词、不加冠词的单数名词
as一词看似很简单，但词性多，词义广，用法灵活，不易掌握，而且在高中阶段出现频率也很高，因此系统地掌握该词对英语的学习大有益处。现将其用法归纳如下： 一、as作介词的用法 1．表示“好像（某人）”，例如：The actor was dressed as a poli-ceman.这个演员化妆成一名警察。 2．表示“有（某人）的身份或特征；作为，当作”，例如：I'm speaking as your employer.我以雇主的身份和你说话。 3．表示“因某人是（某身份）”，例如：As his private secretary，she has access to all his correspondence.由于是他的私人秘书，她能接触到他所有的信件。 4．表示“当某人是（某身份）时”，例如：As a child，1 went ab-road twice.我儿时曾出国两次。 注意：as和like都可以作介词，但意义不同。as表示“以实际的身份或地位”.like则表示“与…相似，以与…相类似的方式”例如：（l）He spoke asa teacher. （2）He spoke likea teacher. 句（1）的意思是：“他作为老师发言”或“他以老师的身份发言”，句（2）的意思是：
“他讲话很像是老师”。 二、as作副词的用法 表示“达到与…相同的程度；与…等同”，例如：He swims fast，but I swim just as fast. She has a lot of books，but I don't have as （so）many.（在否定句中，as可以用so来替代） 三、as作关系代词，引导定语从句 as作关系代词，既可以引导限制性定语从句，也可以引导非限制性定语从句，既可以单独使用，也可以与其他词连用，其用法要比that和which更为复杂，应加以比较和that，which的区别。 （一）as引导限制性定语从句，通常和一些词连用，表示“正如，像…一样” （1）用于such- - -as- -的结构中 例如：I’ve never seen such a talented young man as he is．我从来没有见过像他这样有才能的人。 Such books as I have read are all classical works.这些像我已经读过的书都是经典的著作。 It was such a heavy stone as I can't lift.这是如此重的一块石头，我拎不动。
as 用法归纳和练习题 一、as作副词，表示程度，意为“同样地”。在“as．．．as．．．”，“not as/so．．．as．．．结构中的第一个as是副词，作“和／与．．．(不)一样”解。 Jack is as tall as his father． He doesn't speak English as／so fluently as you． 二、as作介词。 1．作“如，像”解。They got united as one man． 2．作“充当，作为”解。eg：As a writer，he was famous． 三、as作连词，常用来连接主句和状语从句。 1．引导时间状语从句，作“当．．．的时候”解，有“随着．．．”之意，与while意义相近，强调两个动作同时发生；或某事一发生，另一事立即发生。eg： He shouted aloud as her ran along．他一边往前跑，一边高声地呼喊。 I was startled as he opened the door．他一开门，我吓了一跳。 as作连词，相当于when。eg； As a little boy (When he was a little boy)he began to learn to play piano． 2．引导原因状语从句，作“因为，由于”解，与because的用法相近。eg； I must stop writing now，as I have rather a lot of work to do． 3．引导方式状语从句或比较状语从句，作“正如，(如)像”解。例eg： As in your country，we grow wheat in the north and rice in the south．正如(像)你们国家一样，我们在北方种小麦，在南方种大米。(方式状语从句) When at Rome，do as Romans do．入乡随俗。(方式状语从句) Leave it as it is. 保持原状，不要动它。 4．引导让步状语从句，作“虽然，尽管”解。这时从句常用倒装语序，即把从句中的表语、状语或动词原形放在as之前。eg； Strange as it may seem，it is true． 尽管这事看上去很奇怪，但却是真的。 Try as he might，Tom could not get out of the difficulties． 不管怎样努力，汤姆还是摆脱不了困境。 Child as he is, he know s a lot. Much as I like you, I will not marry you. 我虽然很喜欢你，可是不愿与你结婚。 四、as作关系代词。 1．引导限制性定语从句，用在“such．．．as”,“the same．．．as”，“as．．．as” “so… as”等结构中，常译作“像．．．一样的人(或物)”，“凡是．．．的人(或物)”。例eg： He wished to be such a man as Lei Feng was．他曾希望做一个像雷锋那样的人。 My hometown is no longer the same as it was．我的家乡再也不像过去一样了。2．引导非限制性定语从句，用来指代它前面的整个句子(即先行句)。这个分句可以位于句首、句中或句末。
As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。
高中英语as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 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“随着……”或
A s的用法小结
As的用法小结 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-----的发展.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 2hours. ③ while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。如:Work while you work. Play while you play. 2. As =Since 作"既然"、"由于"解,引导原因状语从句,常用来表示已为人们所知或显而易见的原因 或理由。如: As he’s been ill for age s, I will help him. As / Since you're not feeling well, you may stay at home. As he wasn't ready , we went without him. 3. As =in the way that作"像"、"按照……的方式"解,引导方式状语从句。如: Do as I told you. Remember, you must do everything as I do. 4. 用于as--- as或not / so/ as ---- as中,前一个as是副词,后一个as是连词,引导比较状语从句。如:They helped the old as much as possible. I don't speak English so/ as well as she does.
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.这部电影和那部电影一样有趣。 2)Your pen writes as smoothly as mine.你的钢笔书写起来和我的一样流畅。 其否定式为: not as/so +adj./ adv. +as。 例如：This dictionary is not as/so useful as you think.这本字典不如你想象的那样有用。 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 possible Please answer my question as soon as possible.请尽快回答我的问题。 2) as...as usual/before She 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 as He 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 as She 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： 1) as busy as a bee像蜜蜂一样忙碌 2) as easy as ABC像ABC一样容易 3) as deep as a well像井一样深 4) as light as a feather像羽毛一样轻 5) as soft as butter像黄油一样软 6) 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"。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：a) It was snowing when he arrived at the construction site. 他到达工地时，天正在下雪。b) He was watching TV while his mother was cooking.
as 一词看似很简单，但词性多，词义广，用法灵活，不易掌握，而且在高中阶段出现频率也很高，因此系统地掌握该词对英语的学习大有益处。现将其用 法归纳如下： 一、as作介词的用法 1. 表示“好像（某人）”例如：The actor was dressed as a ” f - I poli-ceman.这个演员化妆成一名警察。 2. 表示“有（某人）的身份或特征；作为，当作”,例如：I'm speaking as your employer.我以雇主的身份和你说话。 1厂「 3. 表示“因某人是（某身份）” 例如：As his private secretary, she has access to all his correspondence由于是他的私人秘书，她能接触到他所有的信件。 4. 表示“当某人是（某身份）时”例如：As a child , went ab-road twice.我儿时曾出国两次。 才-~"" 1 f" I ：-^ _/用』X. 注意：as和like都可以作介词，但意义不同。as表示“以实际的身份 或地位” .like则表示“与…相似，以与…相类似的方式” 例如：（l） He spoke asa teacher. （2）He spoke likea teacher.句（1）的意思是：“他作为老师发言”或“他以老师的身份发言”，句（2）的意思是：“他讲话很 像是老师”。 二、as作副词的用法
表示“达到与…相同的程度；与…等同” ，例如：He swims fast, but I swim just as fast.
She has a lot of books, but I don't have as (so) many. (在否定句中，as可以用so来替代) 三、as作关系代词，引导定语从句 as作关系代词，既可以引导限制性定语从句，也可以引导非限制性定 语从句，既可以单独使用，也可以与其他词连用，其用法要比that和which 更为复杂，应加以比较和that，which的区别。 (一) as引导限制性定语从句，通常和一些词连用，表示“正如，像… ” f - I 一样” (1)用于such- - -as--的结构中 例如：I' ve never seen such a talented young man as he l.r厂 is. 我从来没有见过像他这样有才能的人。 Such books as I have read are all classical works.这些像我已经读过的书都是经典的着作。 It was such a heavy stone as I can't lift.这是如此重的一块石头，我拎不动。 注意：比较该句和It was such a heavy stone that I can't lift it.达两句结构完全不同。such---that--是结果状语从句。 (2)用于as- - -as- -/ so- - -as- -的结构中 例如：I got so wonderfula house asI never dreamt of. It was so heavya stone asI can't lift. 注意：比较该句和It was so heavy a stone that I can't lift it.
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 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” 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 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” 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
as if 用法归纳 1．as if 从句的作用 as if一般可由as though来代替。可在look, seem等系动词后引导表语从句。如： He looked as if / though he was ill. 他看起来好像生病了。 It seems as if it is going to rain. 看来好像要下雨了。 它还可引导方式状语从句。如： I remember the whole thing as if / though it happened yesterday. 我记得整个事情，就好像它是发生在昨天一样。 The child talked to us as if he were a grown?鄄up. 那个小孩跟我们讲话就像个大人一样。 2．as if 从句的语气及时态 ①当说话者认为句子所述的是真实的或极有可能发生或存在的事实时，as if从句用陈述语气。如： It sounds as if it is raining. 听起来像在下雨。 He talks as if he is drunk. 从他说话的样子来看他是醉了。 ②当说话人认为句子所述的是不真实的或极少有可能发生或存在的情况时，as if从句用虚拟语气。 表示与现在事实相反，谓语动词用一般过去式。如： You look as if you didn’t care. 你看上去好像并不在乎。 He talked as if he knew what had happened. 他说话的样子，好像他知道发生了什么事情。 表示与过去或与谈话时间为止发生的事实相反，谓语动词用“had +过去分词”。如： He talked about the Great Wall as if he had been there before. 他说起长城来好像他以前去过那里。 The girl listened as if she had been turned to stone.