All about 'since'

理解语法是理解一门语言的关键。
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All about 'Since'

SINCE 后面一般为日期或者动作开始的时间:
since 1933 自1933年起
since this morning 今天早上起
since quarter past five 自五点一刻起
Since 后面不能跟时间段(三个月,一周,等等):
How long have you been working here?你在这儿工作已经多久了?
- (I've been working here) Since 1999. (我在这儿工作)自1999年起。
- (I've been working here) For 10 years.(我在这儿工作)已经10年了。
- I started 10 years ago.我从10年前开始。
Since 也可用作一个连词:
Since Horatio moved to America, he eats a lot more hot-dogs. 自从霍雷肖搬去美国后,他吃更多的热狗。
It's been four years since I last saw you. 自从我上次见你,已经过去四年了。
Since 也可以为副词:
Susie graduated from Oxford several years ago and has been satisfying all of her employers ever since. 苏西数年前从牛津毕业,然后她的每个雇佣者都对她很满意。
最后,since还能表达'as', 'because'或者'given that'因为的含义。当用作此意时,它表示为做某事的理由或者动机。
Since we're going out, why don't we post that letter?既然我们要出去,为什么我们不寄了那封信呢?

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