how是个疑问副词，what是个疑问代词。
一、问天气：How…？=What…like?
如：
How was the weather yesterday? 昨天的天气怎么样？
What was the weather like yesterday?
二、征求意见或建议：
How about…?=What about…？
如：
How about going skating?
What about going skating?去滑冰怎么样？
三、问年龄：
How old…?=What…the age…？你多大岁数了？
四、问看法：
How…like…?=What…think of/about…? 如：
How do you like this film? 你认为这部影片怎么样?
What do you think of this film?
五、问价钱：
How much…？=What…the price 价钱）of…？如：
How much is the book?
What’s the price of the book? 这书多少钱？
六、“how／what+可数名词单数”构成感叹句：
How + adj.+ a/ an+ n…!=What + a/an +adj.+n. …! 如：
How clever a girl she is! 她是个多么聪明的女孩子啊！
What a clever girl she is!
what和how引导的感叹句如何区别
感叹句通常有what, how引导，表示赞美、惊叹、喜 悦、等感情。
what修饰名词，how 修饰形容词，副词或动词，感叹句结构主要有以下几种：
掌握它的搭配，即掌握了感叹句的重点。
How +形容词+ a +名词+ 陈述语序
How+形容词或副词+ 陈述语序
What +名词+ 陈述语序
Vicki：How was your weekend, Ron?Ron: So bad.Vicki: What’s the matter? You look not very well.Ron: Well, I hurt myself when I played soccer.Vicki: What happened? Did you fall down?Ron: Yes.