what,what a,how,how a的用法区别

都是感叹句的表现形式嘛 呵●▂● 呵
1.how+形容词+主语+谓语
eg:how intelligent he is!
2.how+形容词+a(an)+名词+主语+谓语
eg:how beautiful a girl she is!
3.what+形容词+名词+主语+谓语
eg:what red apples there are!
4.what+a(an) 形容词+名词+主语+谓语
eg:what a red apple there is!