给你举几个例子吧: 1.he is so good a boy = he is such a good boy 2.so/such放于句首引起倒装句用来强调: eg:such a good boy is he that he is always ready to help = so good a boy is he that he is always ready to help 3.he is such a boy who ... (这里不能用so替换) 4.as such 意思是 就其本身而论 5.so可以用来修饰形容词so happy但such只能修饰名词 我只能想这么多了,希望你能满意