hi is always used as a greeting but sometimes "hey" is used to grab the attention of a friend/family member.. "hey, have you seen my watch anywhere?"
2010년 9월 4일
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hey is more casual, usually used between friends
2010년 9월 4일
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actually, hey can also be used like hi in certain context, but it depends on the contours (tone) or your voice. English is also a tonal language like Chinese, but most people don't realize that.
2010년 9월 4일
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in my view.hi is more common,choose hey means the relationship appears to be better