i tried to give him some help when necessarily.

问题描述:

i tried to give him some help when necessarily.
为什么句中主从句主语不一致却可省略从句when后的it is
那什么是主语一致是省略的

只是状语从句的一个用法,省略it is/it was这一点与主语是否一致无关那什么是主语一致是省略的