neighborhood period three
学案(无答案)外研版必修1 句型 1.it's been six years since we last saw each other, you know. (p32) ●复习:you know 在此作 ●since引导的时间状语从句,谓语动词用一般过去时,主句用现在完成时,表示“自从......已经有多长时间了”。 e.g.i since i the english club. 自从我加入了英语俱乐部,我取得了很大的进步。 ●it is /has been +段时间+since从句 ●练习