这句话怎么理解that was when that was when things s

Question

这句话怎么理解that was when that was when things sthat was when things started to change为什么这句话可以没有主语

Answer 1

that主语
was谓语动词
When....表语从句

这里when引导的从句用在了系动词was后,也就是说,这一从句是一个表语从句(名词从句的一种)。这里的when相当于“the time when”追答

相当于
That was the time when things started to change.

追问

什么时候when相当于the time when

追答

引导名词从句时。when可以引导名词性从句，定语从句和时间状语从句。表语从句属于名词性从句。

主语，宾语从句

Answer 2

that 【主语】
was【系】
when things started to change【表语从句】