since

as, because, for, since

1. She moved to London last May and has since got a job on a newspaper.
   她去年五月到伦敦，此後一直在报社工作。
2. It was the first time I'd won since I'd learnt to play chess.
   自从我学会下国际象棋以来，这是我第一次赢。
3. How long is it since we visited your mother?
   自从我们看望你母亲以来到现在有多长时间了？
4. We've been friends ever since we met at school.
   自从我们在学校认识之后，我们就一直是好朋友。
5. Since you can't answer the question, perhaps we'd better ask someone else.
   既然你无法回答这个问题，我们最好再问问别人。