it与that在句子中的用法区别
问题描述：
it与that在句子中的用法区别
有个句子是the weather in Beijing is colder than that in Chengdu,句子中间用的是that,然后还有个句子是he found it difficult to study well ,句子中间用的是it而不是that,这是为什么?
答
the weather in Beijing is colder than that in Chengdu,其中的that是代the weather.而he found it difficult to study well 中的it是形式宾语,是一种固定用法.此外,it还可以作形式主语,如：It is difficult for hi...