1. 解答: 对天气提问，可以用How's the weather today? 或者 What is the weather like today?

2. 知识: 英语中对天气提问，通常可以用两种句型结构，一个是How is the weather? 句中how意思是“怎么样?”另一个是What is the weather like? 其中like是介词，其宾语是前置的代词what。这两个句型结构其实都是主系表结构，系动词后面的表语分别由副词how或介词短语like what充当。两个句型在做同义句替换时非常有用。

3. 例句:

① How is the weather today? It is dry and cold.

今天天气怎么样？天气又干又冷。

② What is the weather like in your hometown? It's very nice in spring, summer and fall. But it is a bit cold in winter.在你的家乡天气怎么样？在春天，夏天和秋天，天气非常好。但是在冬天，天气有点儿冷。