感叹句的结构如下：

由感叹词what引导的感叹句。 What+a/an+（形容词）+单数可数名词+主语+谓语What+名词词组+主语+谓语！如: What a fine day it is!What+(形容词）+可数名词复数或不可数名词+主语+谓语!如: What kind women they are!What nice music it is!

由How引导的感叹句。（how用来修饰形容词、副词或动词。）How+形容词（副词）+主语+谓语！如: How hard the workers are working!How clever the girl is!How quickly the boy is writing!How+主语+谓语！如：How time flies! 时光飞逝!

注意:当how修饰动词时，动词不跟着感叹词提到主语之前。如: How time flies!how与what引导的感叹句中的第一种格式(单数名词)一般情况下可以相互转换，转换后意义不变。如: What an interesting story it is! = How interesting the story is!

What a beautiful building it is! = How beautiful the building is!在口语中，感叹句的主语和谓语常常省略。如: What a nice present!（省略it is）How disappointed!（省略she is或其它可作本句主、谓的词语）