as是连词、副词、介词。作连词时意思是“因为，由于；在......时，随着；以……的方式，像；正如；虽然，尽管”，作副词时意思是“如同，像……一样”，作介词时意思是“作为；以……身份；当作；像，如同；当……时”。

相关介绍：

短语搭配

as well同样 ; 也 ; 还是……为好 ; 一样

such as例如 ; 诸如 ; 比如 ; 像

as always一如既往 ; 就像以前一样 ; 成永远

双语例句

1.I never went through a final exam that was as difficult as that one 我从来没有碰到过像那次那么难的期末考试。

2.I'll behave toward them as I would like to be treated 我会以希望别人对待我的方式来对待他们。

3.As you can see, we're still working 如你所见，我们仍在工作。

4.They should make decisions as to whether the student needs more help 他们应该决定学生是否需要更多的帮助。

5.he play started as I got there. 我到那里的时候演出开始了。

6.The news apparently came as a complete surprise 这个消息显然让人大吃一惊。