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)用于表达同一种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)表达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)表达两个短暂行为或事情几乎同步发生.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)接在名词背面表达某一种年龄段时.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常表达一段较长的时间或一种过程,强调主句谓语动词与从句谓语动词同步发生如:Work while you work. Play while you play. 2. As =Since 作"既然"、"由于"解,引导因素状语从句,常用来表达已为人们所知或显而易见的因素或理由如: As he’s been ill for ages, 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,前一种as是副词,后一种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. 5. 表达虽然,尽管 等,引导让步状语从句,常用倒装语序,模式为: adj. /adv. / n.+as +主语+谓语+主句如: Young as he is, he knows much. Tired as they were, they walked on. 6. 表达也------同样 She is a doctor, as was her husband. （二）、 as作关系代词,引导定语从句,表达正如,这一点.如: He is very careful, as we all know. As is well-known, Taiwan belongs to China. 此外,当先行词被the same, such等词修饰时,常用as来引导定语从句如: Such a clever girl as she can learn anything quickly. I was reading the same book as he bought yesterday. （三）、as作介词的用法. 1.表达仿佛。
如:He dressed as a policeman. 2. 表达作为当作如：I found a job as a guide. 3. 当某人是某身份时如：As a child , she was sent to abroad. 4. as引导的介词短语大多用作状语,as译为"作为";少数状况可引起宾语补足语如: As a Party member, I'll take the lead in everything. (状语) She works as a model. (状语) She has me as one of her best friends.(引起宾语补足语) （四）、作副词的用法 1 表达与------等同如：This dress is twice as expensive as that one. 2 像，如等如：As before, he remained unmoved. 总之，通过以上的分析，我们对as的词性和用法有了比较全面的理解和把握，才干在实际的运用中做到心中有数，应付裕如一） as作副词，表达限度，意为“同样地”在“as．．．as．．．”，“not as．．．as．．．”构造中的第一种as是副词，作“和／与．．．(不)同样”解。
eg： Jack is as tall as his father．杰克和她的爸爸同样高 He doesn't speak English as／so fluently as you．她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．她们团结得像一种人同样 2．作“充当，作为”解eg： As a writer，he was famous．作为作家，她是很有名的 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，强调两个动作同步发生；或某事一发生，另一事立即发生eg： He shouted aloud as her ran along．她一边往前跑，一边高声地呼喊 I was startled as he opened the door．她一开门，我吓了一跳 as作连词，相称于wheneg； As a little boy (When he was a little boy)he began to learn to play piano．她小时候就开始学弹钢琴。
2．引导因素状语从句，作“由于，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，由于我尚有许多工作要做 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)你们国家同样，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．不管如何努力，汤姆还是挣脱不了困境 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”等构造中，常译作“像．．．同样的人(或物)”，“但凡．．．的人(或物)”。
例eg：He wished to be such a man as Lei Feng was．她曾但愿做一种像雷锋那样的人 My hometown is no longer the same as it was．我的家乡再也不像过去同样了 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．我们懂得，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，你就会获得进步 3．as if／though常用来引导方式状语从句，作“仿佛，仿佛”解如果从句中讲的是非真实状况，则用虚拟语调。
eg：She loves the child as if／though he were her own．她爱这个孩子犹如爱自己的孩子 As if／though也可用来引导表语从句，常用在“It appears／looks／seems．．．+as if／though”句型构造中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.她仿佛对此事一无所知 4．as to作“有关，至于”解eg；There is no doubt as to his honesty．她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．她每月能挣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，她将于下星期一到这里来。
7．as a result，as a result of表达“由于．．．的成果”eg： She died as a direct result of the accident．她的死是那次事故的直接成果 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，表达目的或成果eg： He studied hard so as to pass。