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Can you use two contractions in a row? For example, could you say, "Let's don't do that"?

closed as off-topic by Janus Bahs Jacquet, Michael Harvey, k1eran, J. Taylor, Mari-Lou A Mar 3 at 10:58

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    And even two contractions queued together or three. – user337391 Mar 2 at 15:57
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    We don't say "Let's don't do that". British people may sometimes say "Don't let's do that", but more often will say "Let's not do that". – Michael Harvey Mar 2 at 16:54
  • There’s no reason you shouldn’t be able to you two contractions in a row – why wouldn’t you? But in most forms of English, “let’s don’t” isn’t grammatical, no. Not because it’s two contractions, but because let takes an infinitive complement, and infinitives are negated by preposing not, not with do-support. So the negative of let us do that is let us not do that (or do not let us do that if you negate the main verb), never *let us do not do that. – Janus Bahs Jacquet Mar 2 at 17:00
  • Also, couldn't've – marcellothearcane Mar 2 at 19:44
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Technically, this isn't correct, because the auxiliary doesn't fit in that expression. However, this is a colloquial phrase that one does hear from time to time. Personally, it doesn't bother me.

The tone is little bit condescending, the way I've heard it used. A more neutral tone would be "It might be better not to do that" or "We would be better advised not to do that," etc.

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