1、as 可用作连词,引导比较、时间、原因及方式等四种状语从句,应注意的是,引导的比较状语从句往往有省略;引导的时间状语从句一般用一般现在时而不用一般将来时;引导原因状语从句时与“Because”和“since”引导的从句比较起起来语气最弱。 as 作介词,意思时“作为”, “以 身份” 。例如:He came to China as a tourist five years ago. 而表示像一样时,like 通常作介词用,而介词后面通常接名词,代名词和动名词。 as in Australia“和在澳大利亚一样”。 asas AS +adj(原级)+AS AS +adv(原级)+AS as so
2、on as 一就 as soon as possible 尽可能快地 as early as possible 尽可能早的 as carefully as you can 尽可能认真地 as careful as you can 尽可能认真的 1。as 是连词,表示“随着”的意义。lives 是 life 的复数,意义是“生活”。 2。as 是连词,表示“因为,由于”的意义。wanting 是现在分词,表示主动意义, wanting to buy cars=who want to buy cars。 As 的用法小结 as 可以作连词、介词及关系代词和副词。现将其用法小结如下: (一) 、 a
3、s 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?意思是随着-的发展.如: As time went on / by, she became more and more be
4、autiful . 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.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 wa
5、s 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.
6、 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
7、 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 car
8、eful, 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
9、 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。