how 和what的感叹句用法

what强调的是名词,而how强调的是形容词或副词!
例如:
what a beautiful girl she is!
How beautiful the girl is!
还有,就是how可以直接加上一个陈述句来表求感叹!
例如:How time flies!

How to ...
What....

how+形容词
How clever you are!
what+名词
What a clever girl you are!