since后接延续性与短暂性动词的用法一、若since引导的状语从句的谓语动词是终止性的过去时，则从句表示的时间是“从动作开始的那一时刻起”。如：He has studied very hard since he came to our school.自从他来到我们学校，他学习就非常努力。We have been missing them since they left here自从他们离开这里，我们就一直很想念他们。这是最常见的一种用法，此处不再多述。二、若since引导的状语从句的谓语动词是持续性动词或表示状态的动词的过去时时，则从句表示的时间是“从那持续动作或状态结束时算起”。如：I havent heard any noise since I slept. Sleep 为持续性动词，sleep的动作结束时，即“醒来”时，这句应译为“我醒后还未听到任何声音”。John is now with his parents in New York, it is already three years since he was a teacher约翰现在和父母一起
