since 
英 [sɪns]  美 [sɪns] 
conj. 从...以后；自...以来；由于；既然

adv. 此后；后来

prep. 自...以后；从...以来

例句：
We hadn't seen each other since that time. 

从那以后我们彼此就没见过面。

He's been a member of parliament since 1987. 

他从1987年以来一直担任议员。

I haven't been to work since Monday. 

我从星期一开始就没上班。

We've both remarried since then. 

自此之后我们俩都再婚了。

It has rained since I got here. 

自我到这里以后就一直下雨。

It was a month since he had arrived in Greenwich. 

他抵达格林尼治已有一个月了。