as的用法
(1)prep.介词
1.像；如同. e.g.They were all dressed as clowns.
2.作为；当作. e.g.I respect him as a doctor.
（2）adv.副词 e.g.You can use that glass as a vase.
1.as...as...像...一样，如同，和...一样
e.g.I have not know him as long as you.
（3）conj.连词
1.当...时 e.g.As she grew older she gained in confidence.
2.照...方式 e.g.They did as I had asked.
3.因为，由于 e.g.As you were out,I left a message.
4.正如，如同 e.g. as you know
5.虽然，尽管 e.g.Happy as there were, there was something missing.(此类型倒装句可用于作文中）
（4）IDM. 短语
1.as you do （对刚才说的话的评论）
e.g.He smiled and I smiled. As you do. 他微笑，我也微笑。

正所谓礼尚往来。

2.as it were可以说，在一定程度上.
e.g.Teachers must put the brakes on,as it were,when they notice students looking puzzled.当老师发现学生神色茫然时，就应该在一定程度上放慢速度
3.as it is照现状.
e.g.We were hoping to finish it by next week-as it is,it may be the week after.
4.as from.../as of...自...起
e.g.Our fax number is changing as from May 12.
5.as for ...至于
6.as against 和...相比较,与...相对照
7.as and when将来...时
e.g.I will tell you more as and when.我一有可能就告诉你更多情况.
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