感叹句中what 修饰名词,how 修饰形容词或副词。fun是不可数名词,所以选what 。感叹句结构:1.What (形容词)名词复数(不可数名词+(主+谓)2.What a(an) 形容词 单数名词+(主+谓)3.How 形容词(副词)+(主+谓)what,how 汉意“多么”。如何判断用what,还是how。1.先断句。有主谓的,将主谓与前面成份断开。2.找名词。有名词用what,无名词用how。例:What beautiful girls they are!What fine weather it is!What a beautiful girl she is!How beautiful she is!How fast she is running!