单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,as,用法归纳,as,一词在高中课本中，看起来简单，但用法很多，经常出现，而又不易掌握。主要表现在词性多，词义广，用法灵活。现将其用法归纳如下：,.as,作副词，表示程度，意为“同样地”。在“,asas”,“not asas”,结构中的第一个,as,是副词，作“和,/,与,(,不,),一样”解。,e.g,Jack is,as,tall,as,his father.He doesnt speak English,as,/,so,fluently,as,you.,.,As,作连词，主要引导以下状语从句：,1.,引导时间状语从句,。与,when,意义相近，强调两个动作同时发生；或某事一发生，另一事立刻发生。,e.g He shouted aloud,as,he ran along.I was startled,as,he opened the door.We get wiser,as,we get older.,2.,引导原因状语从句,，与,because,的用法相近。,e.g,As,it,was getting very late,we soon,turned back.We must stop writing now,as,I have rather a lot of work to do.,3.,引导方式状语从句，作“正如，好象，按照”解。主要的句式有,as if,(,as though,);,just as,;,just asas,.e.g,When at Rome,do,as,Romans do.We do farm work,as,the old peasant teaches us.When a pencil is partly in a glass of water,it looks,as if,it,were,broken.,As,(it is)in your country,we grow wheat in the north and rice in the south.,正如,(,像,),你们国家一样，,。,4.,引导条件状语从句。主要句式有：,as long as,/,so long as,只要,e.g,As long as,you study hard,you will make great progress,.,5.,引导让步状语从句；作“虽然，尽管”解。这时从句常用倒状语序，即把从句中的表语,状语或动词原形放在,as,之前。,e.g,Child as,she is,she knows a lot.,Though she is a child,she knows a lot.,Busy as,he is,he insists on studying.,Though he is busy,he .,Try as,he might,Tom could not get out of the difficulties.,Though he might try,Tom could not get out of the difficulties.,.,As,作关系代词,1.,引导限制性定语从句,，用在“,such as,”,“,the same as/the same,as,”“,so,/asas,”,等结构中，,e.g,He wished to be,such,a man,as,Lei,Feng,was.,The teacher gave the students,so,difficult a problem _,as,_ no one could work out.,He is not,the same,man _,as,_ he used to be.,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”。这个分句可以放在句首，句中，或句末。,e.g,This elephant is like a snake,as,anybody can see.,As,is well known,oceans cover more than 70%of the earth.,3.,若非限制性定语从句位于句首，句中或句末，则用,as,来,引导。,e.g,As,we expected,he completed his task with great success,.,The compass was invented in China,as,we know now,.,4.,若非限制性定语从句中的谓语动词是,be said,be known,be expected,be reported,be announced,等结构时，不论是在句首，句中，句末，都必须,as,用来引导,.e.g,As,is known to us,Taiwan is part of China.,.,As,作介词,1.,作“如，像”解。,e.g,They got united,as,one man.,She spoke of me,as,her closed friend.,2.,作“充当，作为”解。,e.g,As,a writer,he was famous.,English is spoken,as,the first language by most people in Australia.,3.,As,作为介词，常和以下动词连用。,regardas/be known as/consideras useas/describeas/be remembered as work as/act as/be honored as/look on as,We,regard,the sun,as,the source of most forms of energy.,e.g,.,含,as,的固定词组,1.,as soon as,引导时间状语从句。,So/as far as I know,在句中作插入语。意思是“据我所知”。,e.g,As/So far as I know,he will come here next Monday.,As well as,并列连接词组，意思是“和，同”。当其,连接两个并列主语,时，谓语动词应与,前面的主语,在数上保持一致。也可以和短语,not onlybut also,进行替换。,e.g,2.,My parents,as well as,my elder sister,enjoy,music.,试比较下面句子。,My elder sister,as well as,my parents,enjoys,music.,Tom studies,Japanese,as well as,Chinese,.,Tom studies,not only,Chinese,but also,Japanese,.,as well,译为“也，还”经常放在句尾。与,too,also,同义词。,(may/might as,well)e.g,3.,Come here early,and bring your brother,as well,.,So as to do,sth,./soas to do,sth,.,引导 目地或结果状语。,e.g,4.,He studies hard,so as to,pass the exam.,He was,so,strong,as to,carry the heavy box.,5.,such as,意为“例如，诸如”可用来引入同位语，举一例或数例说明它与之同位词的词 所含的具体内容。,e.g,There are different forms of energy,such as,heat energy,light energy,sound energy and etc.,6.,as to(=as for/as regards),关于，至于,as much as/as many as“,多达,，达到,至多”,There is no doubt,as to,his honesty.,He can earn,as much as,500 dollars a day.,7.,as a result/as a result of(,由于,的结果,)as a whole(,就整体来说,)/as follows(,如下,)as usual(,照常,)/as a(general)rule(,通常,)as a matter of fact(,事实上,)/as above(,如上,)as soon as possible/as early as possible as quickly as possible,More examples:,She died,as a result of,the accident.The reasons are,as above,(,as follows,).The machine runs,as usual,.,As a matter of fact,air is a gas.His father gets up early,as a rule,.,You should improve your English,as,soon as possible,.,When sound travels through air,the air,as a whole,doesnt move.,Today our life has been much better,as,compared with,that before liberation.,和,解放前,比,起来我们今天的生活好得多了。,