'after' and 'before'

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'After' and 'before'

BEFORE(早于)和AFTER(迟于)的主要用法:
•  作为介词:
after lunch 午餐之后
before dinner晚餐之前
After thanking them I left.在向他们致谢之后,我离开了。
Before going to France, you should read the guide book.在你去法国之前,你应该看看旅游指南。
You shouldn't buy that expensive car. After all, you don't have that much money.你不应该买那辆昂贵的汽车。毕竟,你并没有那么多钱。
•  作为连词:
After he told me the story, he left my house. 在他给我讲了这个故事之后,他离开了我的房子。
Before we start dinner, I would like to say something.在我们开始晚餐之前,我想说几句话。
•  放在短语结尾,作为副词:
The criminal was stopped a month after he committed the crime.罪犯在他实施犯罪一个月之后被逮捕了。
He has written about this subject before.他以前写过这个专题。
I've seen him before.我之前见过他。

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