since意思是自从。
美?/s?ns/，英?/s?ns/。
词典释义：
prep.自?以后；（表示气愤）何曾。
conj.自?以来；因为。
adv.自?以后；此后；之前。
n.(Since)?（法、美）新斯（人名）。
since的四种用法：
1) since +过去一个时间点 （如具体的年、月、日期、钟点、1980, last month, half past six)。
2) since +一段时间＋ago。
3) since +从句。
4) It is +一段时间＋since从句。
例句：
1、She hasn't been to school?since?Monday.她从星期一起就没上学了。
2、The shop has been closed long?since.这家商店早就关门了。
3、I will not leave you?since?you are the one I love the most.我不会离开你因为你是我最爱的人。
4、Since?we've got a few minutes to wait for the train, let's have a cup of coffee.既然等火车还需要几分钟我们去喝杯咖啡吧。
5、I've been very busy?since?I came back from holiday.我自从度完假回来后就一直很忙。