It's so cold today.Yes,it;s colder than it was yesterday.为什么用was?

问题描述:

It's so cold today.Yes,it;s colder than it was yesterday.为什么用was?
固定搭配吗?

不是的
因为后半句的时间状语是yesterday所以要用wasIt was cold yesterday.
所以要用was
希望对楼主有所帮助~~