初中英语语法：not as...as 和not so...as 和 less zhan 的区别和用法

not as+形容词/副词原形+ as.. = not so +形容词/副词原形+.as ……不如……
less than 少于 或less +形容词/副词+than
This book isn't as/so interesting as that one.
=This book is less interesting than that one .