[常与现在或过去完成时连用]
I have not seen him since.
从那以后，我就没见过他。
Their work has influenced other writers ever since.
他们的作品自那时起一直影响着其他作家。
[常与现在或过去完成时连用]
I have not heard from him since last year.
自从去年以来我一直没有收到过他的信。
I haven’t visited my teacher since I graduated.
自从毕业后我就没拜访过我的老师。
It had been a year since Susan became blind.
苏珊失明已经一年了。
Since you are unable to answer, perhaps I should ask someone else.
既然你回答不了，也许我该问问别人。