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I encountered a couple of sentences, mostly in American movies, that I wondered why they have something I call ' Double negatives', for example:

Don't go no further (why not Don't go further)

We can't grow no crops without no water

I don't see no friends (why not I don't see any friends / I see no friends)

What's the structure of these sentences, are these considered informal? Are there any other correct alternatives to them?

marked as duplicate by StoneyB grammar Jul 19 '14 at 19:45

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