He didn't leave until school was over .从句为什么用过去时?

问题描述:

He didn't leave until school was over .从句为什么用过去时?
“UNTIL 等引导的状语从句,从句中的一般将来时要用一般现在时代替”是不是单指一般将来时?

He didn't leave until school was over .前后时态要一致,如果是没发生的动作时即一般将来时,从句中的一般将来时就要用一般现在时代替