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以前,以后,之前 and 之后 are used to indicate time. There are no obvious differences between 以前 and 之前, 以后 and 之后, except that 之前 and 之后 are more formal and are used more in written texts. Hope my response has been of help to you!
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To answer to Cheng hu you need to register at trainchinese.com
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