so与such用法的区别有四种情况：

① 用于单数可数名词之前，其格式为：

such+a/an+形容词+名词"，如： such a big apple

而"so+形容词+a/an+名词"。 如： so big an apple

② 用于可数名词复数或不可数名词前，只能用 such，如：

It is such good weather that we want to go for a walk. (weather不可数，前面不能用so)

They are such good students that they can pass the exam easily. （students是复数名词）

③ 在只有形容词时只能用so，如： It is so good that I like it very much

④ 在表示多少的many, much, few, little这四个词前只能用so而不能用such.如：

I have so little money that I can't buy the dictionary.

There are so many flowers in the garden.