as的用法小集.doc

1. as 常做关系代词，如such children as love their books中的as是love的主语。such books as are loved by children中的as是are loved的主语，所以要分析清楚句子结构，不可以随便删除谓语动词，如上句中的are。2. 当as指代主句所讲述的内容时，也做关系代词。As is announced in todays papers, all the schools will reopen on 1 September.句中的as指学校将在9月1日重开这件事。值得注意的是，as在作关系代词时，极易被误认为是连接词而加用it。As it is announced in todays papers, all the schools will reopen on 1 September.句中的it是多余的，不该加。3. as much/many .中as用来谈论数量。I havent got as much money as I thought.我带的钱没有我自己想象的那么多。另外as much/many可作为代词，后不接名词。I ate as much as I could.我尽可能得多吃。同时，as much .可作为副词。You ought to rest as much as possible.你应该尽可能多地休息。4. as . as .指“两个人或物在某方面一样”，既可以用在肯定句里，也可以用在否定句中，而so . as .只能用在否定句里。He is as old as she (is).He is not as old as she (is).He is not so old as she (is).“as . as .”有时含有第二个as后的主语有着高程度的那形容词（或副词）所指的特点，如上述例句中有暗指“她很老”。5. 用isnt，wasnt，dont和cant等时，多习惯与as搭配，而不是so，如He isnt as old as she (is)比He isnt so old as she (is)更为普遍。若是句中的形容词或副词前用了 quite这个词时，就习惯不用as，用so。He isnt quite so old as she (is).6. as在表示“原因”时，语气要轻于because。一般来说，as引导的从句会在主句前。as引导的从句也可以在主句后，不过必须要确认从句的内容要是对方知道的。You need not go with me, as you are busy.可以说，因对方知道自己忙。I cannot go with you, as I am busy.应该避免使用，应对方不一定知道我很忙。注意在表示原因时，不可以把as和so连用，两者只能存在一个。 不过as . so .的表达方式是可以的，但指“正像，”。As you like music, so I like poetry.正像你喜欢音乐一样，我喜欢诗歌。7. as还可指“虽然”，如beautiful as she，（虽然她很漂亮）和child as he is（虽然他很孩子气）。这样用时，要注意格式上形容词或名词在as前以及名词前没有a或an； as也可加副词或动词。Much as I should like to see you, I am afraid you may find it inconvenient to come in this hot weather.Search as they would, they could find nobody in the house.8. 要注意区分so . as和so . that，such . as和such . that，彼此之间不可以互相替换。Here is so big a stone as no man can lift.Here is so big a stone that no man can lift it.Here is such a big stone as no man can lift.Here is such a big stone that no man can lift it.习惯上，虽然as和that都可做关系代词或链接词，但使用that时，要与it搭配使用，而as要单用，不可以搭配it使用。9. as指“当的时候”时，引导的从句中的动词不能以将来时呈现。Count the children as they will enter the room.句中的will应该删掉。10. so . as to .（不定式）同enough to .（不定式）表达的意思相同。Write so carefully as to make every sentence clear.Write carefully enough to make every sentence clear.注意这两个结构是固定的搭配。11. as from指“从某日开始”，常用在法律，契约，公告的文件中。The shopping center will be open to the public as from 6 May, 2001.As from 6 May,2001 the shopping center has been open to the public.商场会从2001年5月6日起重新开业。12. as well as指“（除之外）也，又”，要注意它同and和not only . but (also).是有区别的。A as well as B = not only B but also A，指“不单B，而且A”，注意是B在前，A在后。He is a Chinese, but he has foreign friends as well as Chinese friends.He is a Chinese, but he has Chinese friends as well as foreign friends.第一句是正确的表达，第二句是错误的。不可以用A，B，as well as C.I read French, German, as well as English.这个句子是不可以的，应用and来连接。通常来说，as well as作连接词，不是介词。He advised me as well as answering my question.句中把as认作是介词，接了动名词answering，实际上是错误的，应改为answered。结构“both . as well as .”是错误的，避免使用。常有人用“not only . but .as well”的结构，同“not only . but also ”或“not only . but .”表达的意思相似，但是没有后者使用普遍。错句举例与错句分析错句: As the weather was bad, so I didnt go.订正: As the weather was bad, I didnt go.翻译: 因为天气很糟糕，所以我没有去。分析: as是从属连接词，且已包含“因为所以”的意思，不可与so连用。词义辨析】13. as, because, for, since这些连词均含有“因为”之意。as从属连词，语意较because, since弱，着重在主句，所表示的原因或理由是“附带的”。because从属连词，语意强，着重直接的原因或理由，所引出的从句是全句的重心，用以回答why提出的问题。for并列连词，语气较弱，所引出的句子一般放在后面，表示附带说明的理由或推断理由。since语意比because弱，但比as强，一般用于表示“由于大家已知的事实”。14. as, like这两个词均有“像”之意。as从属连词，引出方式从句。like是前置词，后面跟的是宾语。15. though, although, as, even though这些连词均可表示“虽然，尽管”之意。though和although在意义上几乎毫无区别，但在习惯用法上这两个词仍有以下一些差异：1.though可引出倒装语序的让步状语从句，although 则不能。2.though可与even连用，although则不能；在as though结构中，只用though，不能用although。3.though可以置于从句末，而although则不能。4.引出省略句时，通常用though。although与though在意义上相似，但文体上是比较正式用词，语气比though强。as引出让步状语从句只用于倒装语序结构中，语气强于上述两个连词。even though（even if），意为“即使”，引导让步状语从句。though也引导让步状语从句，意为“虽然”；even though有退一步设想的意味，与though不同。though引导的句子所说的是事实，even though引导的句子所说的则不一定是事实。例如：He will not tell the secret even though（even if）he knows it即使他知道这个秘密，他也不肯说出来。He will not tell the secret though he knows it他虽然知道这个秘