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The grammaticality of “that don’t impress me much”
“I don’t know nothing” vs “I don’t know anything”

I've noticed that sometimes people say "It don't mean nothing". But I would expect to hear "It doesn't mean anything" or at least "It doesn't mean nothing".

Could anyone clarify why is that? Or it's totally OK to say that?

Here is an example from the movie "Hamburger Hill", http://www.youtube.com/watch?v=ernKt7JpNfM

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marked as duplicate by Andrew Leach, JSBձոգչ, RegDwigнt Dec 12 '12 at 20:34

This question was marked as an exact duplicate of an existing question.

    
Not exactly.. I'm mostly interested in "don't" vs. "doesn't" part. – Pavel Dec 12 '12 at 19:30
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It's a dialectical variant, African-American or rural Southern, in which the double negative is used in ordinary as an intensifier or even just mere affirmation. – Robusto Dec 12 '12 at 19:34
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Right. This is Negative Concord, which is normal in most languages (Sp No sé nada, Fr Je ne regrette rien) but not in formal English. Formal English uses Negative Polarity instead. – John Lawler Dec 12 '12 at 19:44
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Found in some varieties of British English too. – Barrie England Dec 12 '12 at 19:51

Looks like I found an answer, though I couldn't find it by searching before.

The question is a duplicate of The grammaticality of "that don't impress me much"

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