20.6 比较so和 such
 
  其规律由so与such的不同词性决定。such 是形容词,修饰名词或名词词组,so是副词,只能修饰形容词或副
词。so 还可与表示数量的形容词many,few,much, little连用,形成固定搭配。

so + adj.         such + a(n) + n.
so + adj. + a(n) + n.   such + n. (pl.)
so + adj. + n. (pl.)    such +n. (pl.) 
so + adj. + n. [不可数]  such +n. [不可数]

so foolish         such a fool 
so nice a flower      such a nice flower
so many/ few flowers    such nice flowers
so much/little money.   such rapid progress 
so many people       such a lot of people

  so many 已成固定搭配,a lot of 虽相当于 many,但 a lot of 为名词性的,只能用such搭配。
  so…that与such…that之间的转换既为 so与such之间的转换。