自古以来：since的用法大全
Since her modeling days in New York, Gabrielle had developed a taste for rich food and rich men.
——Desperate Housewives
自从她开始在纽约当模特以来, 她对食物和有钱男人的品味渐渐提高。
——《绝望主妇》
一、关于since，你应该知道的用法有
adv.
此后；后来
About six thousand people were arrested, several hundred of whom have since been released.
约6,000 人被捕，后来其中的几百人又被释放了。
conj.
1.从...以后；自...以来
I have lived here since I was born.
自打出生，我就住在这儿。
2.因为；由于；既然
Since I am busy, would you attend to the matter for me?
因为我忙，你能代我处理这件事吗？
prep.
自...以后；从...以来
She had a sort of breakdown some years ago, and since then she has been very shy.
几年前她得了神经衰弱，自那以后就变得十分腼腆。
二、词义辨析：哪些词汇能表示原因
as, because, for, since
这些连词均含有“因为”之意。
as从属连词，语意较because, since弱，着重在主句，所表示的原因或理由是“附带的”。
because从属连词，语意强，着重直接的原因或理由，所引出的从句是全句的重心，用以回答why提出的问题。
for并列连词，语气较弱，所引出的句子一般放在后面，表示附带说明的理由或推断理由。
since语意比because弱，但比as强，一般用于表示“由于大家已知的事实”。
三、最后，做个填词游戏吧
It's twenty years ______ I've seen her.
我已经二十年没见她了。
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