since

[sins]

conj.因为, 既然, 自从
prep.自从
adv.此后

例句与用法：

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。

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。

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？

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。

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。

详细释义：

ad.(常用于现在完成时或过去完成时)

1. 此后; 从那时到现在

She left school three years ago and has worked as a nurse ever since.

她三年前毕业, 从那时起便一直当护士。

2. 之前, 以前

prep.

(常用于现在完成时或过去完成时)自……以来, 从……至今

I haven't heard from him since last year.

我自去年以来未曾收到过他的信。

conj.

1. (常用于现在完成时或过去完成时)自……以来, 从……至今

It's been ten years since they married.

他们结婚到现在已经十年了。

She has been living a hard life since her husband died.

她自从丈夫死后, 一直过着艰苦的生活。

2. 既然; 因为, 由于

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。