1.Until yesterday his family （had not heard）from him for six months.2.He （did not ）go to bed until his mother came back.
问题描述：
1.Until yesterday his family （had not heard）from him for six months.2.He （did not ）go to bed until his mother came back.请问为什么都是until,第一句要做成过去完成,第二句是一般过去啊?求详解…急!
但not go to bed 不也是持续性动作么
答
1、时间状语for six months为一段时间,和完成时连用.
2、go to bed是短暂动作,与一般过去时连用比较合理.