中间必须用形容词或副词原级。例如：
This classroom is as big as that one.
这间教室和那间一样大。
He runs as fast as Tom.
他和汤姆跑的一样快。
否定结构：not as/so…as,“不如……”。上面的两个句子可分别改为：
This classroom is not as/so large as that one.
这间教室不如那间大。
He doesn’t run as/so fast as Tom.
他跑得不如汤姆快。
2. as soon as 一……就……
用来引导时间状语从句。若主句是一般将来时，从句要用一般现在时。例如：
I’ll tell him the plan as soon as I see him.
我一看到他就告诉他这个计划。
He’ll go home as soon as he finishes his work.
他一完成工作就回家。
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