题目

分析下几个词吧
Air is made up of matter
matter为什么用单数?
He said the damages were not paid but the damage was repaired last week.
分析下damage这个词什么时候用复数什么时候用单数?
He fell from the steps leading to the building and sprained his ankle.
step为什么用复数?

提问时间：2021-04-01

答案

Matters如果用“matters"就变为事件复数,而不是物质.
第二句差点看错,原因很简单,因为前半部分说造成的损害（多数）没被补偿,但是从句只说了 单个 损害,所以用was.可能句子表示了精神和物质损害吧?
steps这此泛指楼梯,用"step"不对,因为表达不是只说”他从单个台阶上摔下来了“.