So/as + 形容词或副词原级+ as的用法

1）在否定句或疑问句中可用so… as。 
　　He cannot run so/as fast as you. 
2）当so/as… as 中间有名词时采用以下格式。 
　　as +形容词+ a +单数名词 
　　即"so +adj. + a/an + n. (单数) + as "结构中 
    I am not so strong a man as I was.我已经没有从前那么强壮了 
　　This is as good an example as the other is. 
    as + many/much +名词 
　　I can carry as much paper as you can.. 

3）用表示倍数的词或其他程度副词做修饰语时，放在as的前面。
　　This room is twice as big as that one.
　　Your room is the same size as mine.　　
4) 倍数+ as + adj. + as　<=> 倍数+ then + of
　　This bridge is three times as long as that one.
　　This bridge is three times the length of that one.
　　Your room is twice as large as mine.
　　Your room is twice the size of mine.
5)几个关于as...as的常见句型：

  (1)as...as possible 

  Please answer my question as soon as possible.请尽快回答我的问题。

  (2)as...as usual/before

  She looks as pretty as before.她看起来和以前一样漂亮。

  (3)as long as... (引导条件状语从句) 

  It took us as long as three years to carry out the plan.我们花了长达三年的时间才完成这项计划。

  (4)as far as 

  He walked as far as the railway station yesterday evening.昨天傍晚，他一直散步到火车站。

  (5)as well as 

  She cooks as well as her mother does.她烧菜烧得跟她母亲一样好。

  一些带有as...as结构的常见短语归纳：

  as busy as a bee像蜜蜂一样忙碌

  as easy as ABC像ABC一样容易

  as deep as a well像井一样深

  as light as a feather像羽毛一样轻

  as soft as butter像黄油一样软

  as rich as a Jew像犹太人一样富裕