一、侧重点不同
1、how:how从句中主要是修饰成分,修饰形容词或是副词。
2、what:what从句中是事物提问时,在从句里是主要结构之一。
二、句型不同
1、how: How+形容词/副词+主语+谓语;How+形容词+a/an+可数名词单数+主语+谓语;How+主语+谓语。
2、what: What+a/an+形容词+可数名词单数+主语+谓语;What+形容词+可数名词复数+主语+谓语;What+形容词+不可数名词+主语+谓语;What+a/an+可数名词单数。
例句
1、What’s the weather like today?
How is the weather today?
今天天气怎么样?
2、What do you think of the film?
How do you like the film?
你认为这部电影怎么要?
3、What about having a picnic tomorrow?
How about having a picnic tomorrow?
明天去野餐怎么样?