not as as 用法

not as as 用法
not as as 用法

not as as 用法
：as...as的含义为“和……一样”,用于形容词、副词的同级比较.需要大家注意的是,两个as的词性和用法不一样,第一个as是副词,后面接形容词或副词的原级,第二个as多为连词,后面多接比较状语从句,其基本结构为：as + adj./ adv.+ as.如：
This dictionary is as useful as you think.这本字典和你想象的一样有用.
He speaks English as well as Zhang Ming (does).他讲英语和张明一样好.
as...as的否定式为not as / so + adj./ adv.+ as,表示“不如”,其中,第一个as可以用副词so替换,但第二as则不能.如：
This tree is not as / so tall as that one.这棵树不如那棵树高.
Tom doesn't run as / so fast as Jack.汤姆不如杰克跑得快.

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