What a happy day is对还是What a happy day对,为什么?

问题描述:

What a happy day is对还是What a happy day对,为什么?

what ,how 都可以用来引导感叹句,句式如下:
what+ a(n)+adj +名词+(主语+谓语),如果是不可数名词,a(n)可以省略,如:what bad weather it is.
所以上面的句子应该为what a happy day it is或者what a happy day .
how +adj +a(n) +(主语+谓语),如:how delicious the food is!
how beautiful a girl she is !