since前后分别用什么时态

since从句接什么时态，主句接什么时态

since 解释为自..以来。主句用现完，从句用一般过去式，例：she has been living a hard life since her husband died. 或者有一种特殊举行，it is+时间段+since+从句，从句时态还是一般过去 例：it's been ten years since they married。 还有一种解释为由于，既然： he must have taken the book since it isn't here. 他一定是把书拿走了,因为书已不在这里了。 since it is so hot, let's go swimming. 既然天气这么热,我们去游泳吧。

英语的since前后都用什么时态

since如果解释为“自从...以来”，引导时间状语从句时，则其前面的主句用现在完成时，其后的从句用一般过去时。如：i‘ve made great progress in english since i came to this school.自从我来到这个学校以来，我在英语上取得了巨大的进步。