how、what的感叹句

How,修饰副词carefully，what不能修是副词，只能修饰名词

祝楼主更上一层楼

How
一般修饰形容词和副词
eg.How good a man he is!
What
一般修饰名词或者名词短语
eg.What a good man he is!

填how，经典例子
what a tall tree it is
how tall the tree is
看出区别了么