1）在否定句或疑问句中可用so… as。

• He cannot run so/as fast as you.

2）当as… as 中间有名词时采用以下格式。

as +形容词+ a +单数名词
as + many/much +名词

• This is as good an example as the other is.
• 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.