[全国公共英语考试语法——as+形容词或副词原级+as]1）在否定句或疑问句中可用so… as。 He cannot run so/as fast as you. 2）当as… as 中间有名词时采用以下格式。 as +形容词+ a +单数名词 as + many/much +名词 This is as...+阅读
一、“as（否定句中可用so）+adj./adv.+as…”，其基本意思为“……和……一样”。但在实际应用中，此结构在不同的语境中含义差异较大。
1、表示不同人或物同一性质的比较，意为“……和……一样……＂。 The tree is as tall as the building(is). 这棵树和那栋楼一样高。 Michael is as bright as George(is). 迈克尔和乔治一样聪明。
2、表示同一个人或物不同性质的比较，意为“既……又……” Alice works as happily as(she)plays(happily). 艾丽丝愉快地工作，尽情地玩。
Danny is not so wise as he is witty. 丹尼为人风趣，但欠明智。
3、用于表示两个人或物不同性质的比较，表示程度相同或相当，意为“……而……”。 He was as handsome as his wife was beautiful. 他长得非常英俊，他的妻子也长得非常漂亮。 He was as experienced as his brother was green. 他经验丰富，而他兄弟却涉世未深。
二、as…as结构的另一种形式是“as much/many+名词+as+从句”。
Mary has written as many essays as her brother. 玛丽写的文章篇数和她弟弟一样多。 It is as much your fault as your wife's. 这既是你的过错，也是你妻子的过错。 Henry is as much a hypocrite as·John. 亨利跟约翰一样是个伪君子。
三、若有修饰成分，如twice,three times,half,a quaer等，必须置于第一个as之前。 You are not half as clever as you think you are.你可不像自己想象的那么聪明。
She isn't going out with a man who is twice as old as she. 她不打算和一个比她大一倍的人出去散步。 You've made just as many mistakes as I have. 我和你犯的错误一样多。 We've produced twice as much cotton this year as we did lastyear. 我们今年的棉花产量是去年的两倍。
四、as…as结构的另一变体形式是“as+形容词原级+名词词组+as” I don't want as expensive a car as this.=I don't want a car as expensive as this. 我不要这么贵的汽车。
Tony is as clever a boy as his brother. 托尼是一个和他兄弟一样聪明的男孩。
五、当as…as与表示重量、数量、时间、距离、价格等的计量名词连用时。往往并不表示比较。而是构成一个形容词组，意为“重达……，多达……，高达……”等。 The river is as deep aslO meters. 这条河深达10米。 Frosts often occur as late as May. 往往到5月份还有霜。
六、“as+原级+as any（或ever）”、“as+原级+as…can be”、“nothing（或no）+so+原级+as…”等结构表达的是最高级意义。
即在某种程度上或某方面达到极限或最大限度。 He is as great a mathematician as any. 他是一位非常杰出的数学家。 He is as happy as happy can be. 他幸福无比。 No one is so deaf as those who won't listen. 最聋者莫过于不听劝说的人。
七、as…as…不表示比较的几个常见句型。 1.as…as possible/sb can尽可能的…… Please answer my question as soon as possible. 请尽快回答我的问题。
The detective is searching the man as carefully as he can. 那个侦探正在尽可能仔细地搜查那个男子的身体。 2.as…as usual/before像以前一样…… She looks as pretty as before. 她看起来和以前一样漂亮 Though they failed,they still worked as hard as usual. 尽管他们失败了，但他们仍像以前一样努力工作。 3.as long as只要，引导条件状语从句 I will stay with you as long as there is a room flree. 要是你有一间空余的房子，我就住在你这里。
You may borrow this book as long as you promise to give itback. 只要你答应归还，你就可以把这书借走。
as的用法
as的用法：一）as作副词，表示程度，意为“同样地”。在“as...as...”,“not as...as...”结构中的第一个as是副词，作“和/与...（不）一样”解。eg: Jack is as tall as his father.杰克和他的父亲一样高。 He doesn't speak English as/so fluently as you.他的英语说得不如你流利。 二）as作介词。 1.作“如，像”解。eg: They got united as one man.他们团结得像一个人一样。 2.作“充当，作为”解。eg: As a writer,he was famous.作为作家，他是很有名的。 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.他小时候就开始学弹钢琴。 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.我必须停笔了，因为我还有许多工作要做。 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） 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。 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”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），意思是“这一点”。这个分句可以位于句首、句中或句末。eg: As is well known,oceans cover more than 70% of the earth.我们知道，海洋占地球面积的百分之七十以上。 五）含as的固定词组的用法 1.as soon as作“一…就”解，引导时间状语从句。
eg: As soon as I get to Beijing,I'll write to you.我一到北京，就给你写信。 2.as/so long as作“只要”解，eg; As/So long as you study hard,you'll make progress.只要你努力，你就会取得进步。 3.as if/though常用来引导方式状语从句，作“好像，仿佛”解。如果从句中讲的是非真实情况，则用虚拟语气。eg: She loves the child as if/though he were her own.她爱这个孩子如同爱自己的孩子。 As if/though也可用来引导表语从句，常用在“It appears/looks/seems...+as if/though”句型结构中。eg; It appears as if/though it is going to clear up.看起来天要晴了。 It seems as if/though he knew nothing about it.他好像对此事一无所知。 4.as to作“关于，至于”解。eg; There is no doubt as to his honesty.他的诚实是无可置疑的。 5.as much/many as作“多达...”，“达到...之多”解。
eg: He can earn as much as 5000 dollars a month.他每月能挣5000美元。 6.so/as far as I know作“就我所知”解，在句中作插入语。eg: As/So far as I know,he will come here next Monday.据我所知，他将于下星期一到这里来。 7.as a result,as a result of表示“由于...的结果”。eg: She died as a direct result of the accident.她的死是那次事故的直接结果。 8,as well为“也，还”之意。eg: Come early,and bring your brother as well.早点来，把你的弟弟也带来。 9.so as to,so...as to若跟动词原形，表示目的或结果。eg: He studied hard so as to pass the exam.他努力学习以便通过考试。（表示目的） as……as AS +adj（原级）+AS AS +adv（原级）+AS as soon as 一……就 as soon as possible 尽可能快地 as early as possible 尽可能早的 as carefully as you can 尽可能认真地 as careful as you can 尽可能认真的 so...as 一般用于否定句，as...as 一般用于肯定句，（肯定否定都能用） so...as不可用于肯定句.as...as与so...as均可表示＂与……一样＂，as...as...的用法：两个as中间可以加形容词或者副词，由它要修饰的内容决定. 它们的用法有异同之处： 肯定句用as...as，不用so...as；否定句两者均可使用.例如： I didn't go as /so far as you.我走得不像你那么远. They walked as far as the station.他们步行到了车站. 误：They walked so far as the station.
as的用法？
as if 的用法
一、as if 从句的作用 1. 在look, seem 等系动词后引导表语从句。如： She looks as if she were ten years younger. 她看起来好像年轻了十岁。 It seems as if our team is going to win. 看来我们队要胜了。 2. 引导方式状语从句。如： She loves the boy as if she were his mother. 她爱这男孩，就好像她是他的母亲一样。 The child talked to us as if he were a grownup. 那孩子跟我们谈起话来，像个成年人似的。
二、as if 还可用于省略句中 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，这样as if 后就只剩下名词、不定式、形容词（短语）、介词短语或分词。如： He acts as if (he was) a fool. 他做事像个傻子。 Tom raised his hands as if (he was going) to say something. 汤姆举起手好像要说什么。 She left the room hurriedly as if (she was)angry. 她匆忙离开房间好像生气的样子。
三、as if 从句的语气及时态 1. as if 从句用陈述语气的情况。 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。如： It sounds as if it is raining. 听起来像是在下雨。 He talks as if he is drunk. 从他谈话的样子来看他是醉了。 2. as if 从句用虚拟语气的情况。 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。从句虚拟语气动词时态的形式如下：
（1）如果从句表示与现在事实相反，谓语动词用一般过去时。如： You look as if you didn' t care. 你看上去好像并不在乎。 He talks as if he knew where she was. 他说话的样子，好像他知道她在哪里似的。
（2）从句表示与过去事实相反，谓语动词用“had+过去分词”。如： He talks about Rome as if he had been there before. 他说起罗马来好像他以前去过罗马似的。 The girl listened as if she had been turned to stone. 那女孩倾听着，一动也不动，像已经变成了石头似的。
（3）从句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. 他张开嘴好像要说什么。 It looks as if it might snow. 看来好像要下雪了。
英语 as连词的用法
斗胆作如下回答，希望能有价值：
1. as在英语中做连词引导从句的现象很普遍，很多种多样。本句话中无需用it，因为如果用了的话，it也是指代this kind of iron的，为了避免重复，语言中是有省略现象的，包括我们的母语。举个例子：The smile is as sweet as nothing could compare.
2. 你说的“发现大多数时候连词也是有关系代词的用法的。（语法书已证实，不懂得别乱说啊）
”这句话要另当别论。你给出的句子中，第一个as是副词，意思可以理解为“像......”，第二个as引导比较状语从句。也就是说，你给的句子中不存在“关系代词”这么一说。关系代词是用在定语从句中的说法。两个定语从句的例子供你参考：限制性定语从句：Tom got the same baseball cap as you have.非限制性定语从句：As we all know, life is full of wonders.
3. 你给出的as I said看你用在哪里了。用在这个句子中They didn't do the experiment as I said中，就是引导方式状语从句，as叫从属连词，用在这个句子中As I said, the so-called thief is actually innocent中，就是引导非限制性定语从句，as叫关系代词。
纯手打，希望有帮助。
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