英语中as的用法大全.doc

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。 下列情形时,只用as, 而不用when或while。 1)用于表示同一个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)表示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)表示两个短暂行为或事情几乎同时发生.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)接在名词后面表示某一个年龄段时.如: As a young man, he was active in sports. when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. while常表示一段较长的时间或一个过程,强调主句谓语动词与从句谓语动词同时发生。如:Work while you work. Play while you play. 2. As =Since 作既然、由于解,引导原因状语从句,常用来表示已为人们所知或显而易见的原因或理由。如: As hes been ill for ages, I will help him. As / Since youre not feeling well, you may stay at home. As he wasnt 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,前一个as是副词,后一个as是连词,引导比较状语从句。如:They helped the old as much as possible. I dont speak English so/ as well as she does. 5. 表示虽然,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. 表示也-一样。 She is a doctor, as was her husband. （二）、 as作关系代词,引导定语从句,表示正如,这一点.如: He is very careful, as we all know. As is well-known, Taiwan belongs to China. 另外,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.表示好像。如:He dressed as a policeman. 2. 表示作为当作。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;少数情况可引起宾语补足语。如: As a Party member, Ill 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 表示与-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，才能在实际的运用中做到心中有数，应付裕如。 adv. 同样地, 一样地 She is as tall as her mother. 她和她母亲一样高。 prep. (表示时间)当还是的时候 As a schoolboy, he showed every sign of genius. 当他还是个小学生的时候, 就显示出了天资聪慧。 (表示方式)以的身份, 以资格, 作为; 以形式, 以作为; 以角色, 扮演角色; 如同, 像 (表示结果)成为, 看作, 看成 We had better treat it as a joke. 我们最好把它当作玩笑。 (表示目的)为了, 以为目的 The dykes were built as a protection against the sea. 建筑堤坝是为了防止海水泛滥。 (表示举例)例如, 诸如之类的 We talked about such subjects as the weather. 我们谈论了诸如天气之类的话题。 conj. 在期间, 当时候 I was coming in as he was going out. 我进来的时候, 他正出去。 尽管, 即使, 虽然 Intelligent as you are, I suspect you will fail. 尽管你聪明, 我猜想你会失败。 像一样 由于, 因为 As you werent there I left a message. 因为你不在那里, 我留了个信儿。 特别提醒下面两点：as引导方式状语从句时，翻译成“按照”。I have changed it as you suggested.as作关系代词引导非限制性定语从句时，位置灵活，可位于句首，句中，翻译成“正如.一样/正像.一样”在定语从句中做主语或宾语 。As is well known to us all,Taiwan is a part of China.（as代Taiwan is a part of China做is well known 的主语）Taiwan is a part of China,as is well known to us all.（as代Taiwan is a part of China做is well known 的主语）Machine,as