1.It's rainy.对rainy.提问就是What is the weather like today 汉语意思是今天天气怎么样？回答是今天有雨。

2.rainy是形容词。It's rainy.是主系表结构。rain是不可数名词和动词下雨的意思。

3.考点。Does it often rain in your city Yes,it does No,it doesn't