THAT'S WHEN I DECIDED TO CHANGE是什么从句

问题描述:

THAT'S WHEN I DECIDED TO CHANGE是什么从句

终极回答驾到.
That是主语,was是谓语,是系动词,而系动词后的成分是表语,所以when I decided to change是表语从句.全句意为:那是我决定做出改变的时刻.