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such a/an adj n和so adj a/an n的意思一样，都表示“如此..."，它们的区别就在于such是形容词，修饰的是后面的名词或名词词组；而so是副词，只能是用来修饰形容词或副词的。so还可以表示数量的形容词，与many、few、much、little连用，形成固定搭配。
such a/an adj n和so adj a/an n的相关例句
1、Shanghai is such a big city==Shanghai is so big a city.
2、This is such an interesting book.== This is so interesting a book.
3、Such a good girl is she that we all like her.
4、Such a selfish man did Tom become that no one loved him any longer.
5、Such a wonderful sight did I watch last night.
6、It's so interesting a book that I have read it many times.
7、It's so heavy a box that I can't carry it .