since
A) ad.(常用於現(xiàn)在完成式或過去完成式)
1.此後;從那時(shí)到現(xiàn)在
e.g.She left school three years ago and has worked as a nurse ever since.她三年前畢業(yè),從那時(shí)起便一直當(dāng)護(hù)士.
2.之前,以前
B) prep.
1.(常用於現(xiàn)在完成式或過去完成式) 自...以來,從...至今
e.g I haven't heard from him since last year.
我自去年以來未曾收到過他的信.
C) conj.
1.(常用於現(xiàn)在完成式或過去完成式) 自...以來,從...至今
e.g.It's been ten years since they married.
他們結(jié)婚到現(xiàn)在已經(jīng)十年了.
e.g.She has been living a hard life since her husband died.
自從丈夫死後,她一直過著艱苦的生活.
2.既然;因?yàn)?由於
e.g.He must have taken the book since it isn't here.
他一定是把書拿走了,因?yàn)闀巡辉谶@里了.
e.g.Since it is so hot,let's go swimming.
既然天氣這麼熱,我們?nèi)ビ斡景?