原级
as＋原级＋as＋比较对象，表示对比双方在性质、程度、特征方面相等或相似
My parcel is as heavy as yours.
Our school is as big as their school.
not＋as /so＋原级＋as＋比较对象，表示“……不如……”
Money is not so important as health.
It is not so expensive as you might expect.
“as...as”结构有时不用来表示两者的比较，而是用来表示“尽可能……，尽量……”
We will help you as well as we can.
Take as many apples as you like.
Tom runs away as fast as possible.
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