informal: 말하지 마.
informal: 말하지 마요. (말하지 마. + 요 = 말하지 마요).
This is a colloquial expression. It's more polite than 말하지 마 because you add 요 at the end, but it's NOT formal. .
formal: 말하지 마세요.
most formal (honorific): 말하지 마십시오.
Hope this helps.
January 22, 2013
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