as用法小结.ppt

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1、1、表示方式、程度、情况。意即、表示方式、程度、情况。意即“照照方式、如同、方式、如同、象象”They did as I had asked. 他们是按照我的要求做的。他们是按照我的要求做的。2、表示时间，意为、表示时间，意为“当当时候时候”，“一边一边一一边边”“”“随着随着”As he grow older he gained in confidence. 随着年龄随着年龄的增长他的信心增强了。的增长他的信心增强了。3、表示原因，意为、表示原因，意为“因为，由于因为，由于”As you were out, I left a message. 你不在，所以我留你不在，所以我留下了一张字条。下

2、了一张字条。4、表示让步，意为、表示让步，意为“尽管；虽然；即使尽管；虽然；即使”（表语一般放（表语一般放在本从句之首；如有可数名词单数，前面也不要冠词）在本从句之首；如有可数名词单数，前面也不要冠词）Child as he is ,he can tell black from white. 尽管他是尽管他是个孩子，但他能够分辨黑白。个孩子，但他能够分辨黑白。Happy as they were, there was something missing. 尽管他们很快乐，但总缺少点什么。尽管他们很快乐，但总缺少点什么。5、引导定语从句、引导定语从句1）as引导非限制性定语从句，常指主句所表达的

3、整引导非限制性定语从句，常指主句所表达的整个事情，可置句首、句中、句末，常见个事情，可置句首、句中、句末，常见 as we all know,as I see it 照我看来，照我看来，as it appears to me 依依我看来。我看来。As we all know, oceans cover more than 70 percent of the earth.正如我们所知道的，海洋占地球面积正如我们所知道的，海洋占地球面积70以上。以上。asas一词在高中课本中，看起来简单，但用一词在高中课本中，看起来简单，但用法很多，经常出现，而又不易掌握。主要法很多，经常出现，而又不易掌握。主要

4、表现在词性多，词义广，用法灵活。现将表现在词性多，词义广，用法灵活。现将其用法归纳如下：其用法归纳如下：. 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是副是副词，作词，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，

5、强调意义相近，强调两个动作同时发生；或某事一发生，另一事立刻两个动作同时发生；或某事一发生，另一事立刻发生。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

6、 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。主要的句式有解。主要的句式有as if(as though);just as;just asas . e.g When in 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,

7、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

8、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，

9、用在，用在“such as”, “the same as/the same as”等结构中，等结构中，常译作常译作“像像一样的人或物一样的人或物”，“凡是凡是的人或物的人或物”。e.g He wished to be such a man as Lei Feng was.My bike is the same as yours.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 li

10、ke 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

11、 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， 句末，都必须句末，都必须as用来引导用来引导. e.gAs is known to us, Taiwan is a 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.

12、 English is spoken as the first language be 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/ 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

13、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，谓语动词时，谓语动词应与应与前面的主语前面的主语在数上保持一致。也可以和在数上保持一致。也可以和短短 语语not onlybut also进行替换。进行替换。 e.g2.My parents as well as my elder siste

14、r 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。e.g3.Come here early, and bring your brother as well.So as to do sth./soas to

15、do sth.引导引导 目地或结果状语。目地或结果状语。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”可用来引入可用来引入同位语，举一例或数例说明它与之同位词同位语，举一例或数例说明它与之同位词的词的词 所含的具体内容。所含的具体内容。e.g There are different forms of energy, such as heat energy,light energy, sound energy and

16、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，达到到 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 (照常照常)/as a (general) rule(通常通常) as a matte

17、r 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. Today our life has been much better as compared with that before liberation. 和和解放前解放前比比起来我们今天的生活好得多了。起来我们今天的生活好得多了。15 结束语结束语