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”。 as… … as AS +adj(原级)+AS AS +adv(原级)+AS as soon 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）、 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。 ①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 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. ②when 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 ...
