Accentuating the Negative
Multiple negatives
In grammar, the general rule is that you shouldn’t use two negatives. It’s incorrect to say I didn’t see no one, although people will know what you mean. The correct thing is, obviously, I didn’t see anyone.
Contractual drafters like to avoid double negatives because they give rise to ambiguity. The concern isn’t so much over a sentence like I didn’t see know no one, but with repeated use of not or other negatives in a long, complicated sentence where the net effect may be uncertain.
Not all languages are averse to the double negative. …