AS的用法总结.ppt
As 用法小结用法小结asas词性多，词义广，用法灵活。现将其用法词性多，词义广，用法灵活。现将其用法归纳如下：归纳如下：. as 作副词，表示程度，意为作副词，表示程度，意为“同样地同样地”。在在“asas”, “not asas”结构中的第一个结构中的第一个as是副词，作是副词，作“和和/与与(不不)一样一样”解。解。e.gJack 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：作连词，主要引导以下状语从句：1. 引导时间状语从句引导时间状语从句。与。与while意义相近，强意义相近，强调两个动作同时发生；或某事一发生，另一事调两个动作同时发生；或某事一发生，另一事立刻发生。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. 引导原因状语从句引导原因状语从句，与，与because的用法相近。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，作引导方式状语从句，作“正如，好象，按照正如，好象，按照”解。解。主要的句式有主要的句式有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. 正如正如(像像) 你们国家一样，你们国家一样， 。 4. 引导条件状语从句。主要句式有：引导条件状语从句。主要句式有： as long as /so long as 只要只要 e.g As long as you study hard, you will make great progress.5. 引导让步状语从句；作引导让步状语从句；作“虽然，尽管虽然，尽管”解。解。这时从句常用倒状语序，即把从句中的表语这时从句常用倒状语序，即把从句中的表语,状状语或动词原形放在语或动词原形放在as之前。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作关系代词作关系代词1.引导限制性定语从句引导限制性定语从句，用在，用在“such as”, “the same as/the same as”“so/asas”等结构中，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 _ no one could work out.He is not the same man _ he used to be.2. 引导非限制性定语从句引导非限制性定语从句，用来指代它前面的，用来指代它前面的整个句子整个句子(即先行句即先行句)，意思是，意思是“这一点这一点”。这个。这个分句可以放在句首，句中，或句末。分句可以放在句首，句中，或句末。e.gThis 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，若非限制性定语从句位于句首，句中或句末， 则用则用as来引导。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，等结构时，不论是在句首，句中， 句句末，都必须末，都必须as用来引导用来引导. e.gAs is known to us, Taiwan is part of China. As作介词作介词1. 作作 “如，像如，像”解。解。e.g They got united as one man. She spoke of me as her closed friend.2. 作作“充当，作为充当，作为”解。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。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. 含含as的固定词组的固定词组1.as soon as引导时间状语从句。引导时间状语从句。 So/as far as I know在句中作插入语。在句中作插入语。意思是意思是“据我所知据我所知”。e.gAs/So far as I know, he will come here next Monday. As well as并列连接词组，意思是：并列连接词组，意思是：“和，和， 同同”。当其当其连接两个并列主语连接两个并列主语时，谓语动词应与时，谓语动词应与前面的主前面的主语语在数上保持一致。也可以和短在数上保持一致。也可以和短 语语not onlybut also进行替换。进行替换。 e.g2.My parents as well as my elder sister enjoy music. 试比较下面句子。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译为译为“也，还也，还”经常放在句尾。与经常放在句尾。与too, also同义词。同义词。(may/might as well)e.g3.Come here early, and bring your brother as well.So as to do sth./soas to do sth.引导引导 目地或目地或结果状语。结果状语。e.g4.He studies hard so as to pass the exam. He was so strong as to carry the heavy box.5.such as意为意为“例如，诸如例如，诸如”可用来引入同位语，可用来引入同位语，举一例或数例说明它与之同位词的词举一例或数例说明它与之同位词的词 所含的具体内所含的具体内容。容。e.gThere are different forms of energy, such as heat energy,light energy, sound energy and etc.6.as to(=as for/as regards)关于，至于关于，至于 as much as/as many as “ 多达多达，达到，达到 至多至多” e.gThere 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(由于由于的结果的结果) as a whole(就整体来说就整体来说)/as follows(如下如下 ) as usual (照照常常)/as a (general) rule(通常通常) as a matter of fact(事实上事实上)/as above(如上如上) as soon as possible/as early as possible as quickly as possibleMore 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.
