1）在否定句或疑問句中可用so as.例如：

　　He cannot run so/as fast as you. 他沒你跑得快。

　　2）當as as 中間有名詞時采用以下格式：as +形容詞+ a +單數名詞/ as + many/much +名詞。例如：

　　This is as good an example as the other is. 這個例子和另外一個一樣好。

　　I can carry as much paper as you can. 你能搬多少紙，我也能。

　　3）用表示倍數的詞或其他程度副詞做修飾語時，放在as的前面。例如：

　　This room is twice as big as that one. 這房間的面積是那間的兩倍。

　　Your room is the same size as mine.　你的房間和我的一樣大。

　　4）倍數+ as + adj. + as　 倍數+ the + of.例如：

　　This bridge is three times as long as that one. 這座橋的長度是那座的三倍。

　　This bridge is three times the length of that one.

　　Your room is twice as large as mine. 你的房間是我的兩倍大。

　　Your room is twice the size of mine.