what + a/an + 形容词 + 名词（单数）+ 主语+谓语

what + 形容词 + 名词（复数、不可数）

how + 形容词或者副词 + 主语 + 谓语

What a fine day it is!

What an interesting book it is!

What fine books they are!

What fine weather it is today!

How good the book is!

How hard he studies!