What are double negatives?

A double negative happens when you put two negative words together in the same sentence.
If the two negative words are talking about the same thing, they cancel each other out - so the message becomes positive. This is confusing and it is a major mistake if you are in a formal situation (for example, writing a letter or at a job interview).

Examples of negatives:

Negative words	Negative verbs
no, not, none no-one, nothing, nowhere neither, nobody, never	doesn't, isn't, wasn't wouldn't, couldn't, shouldn't won't, can't, don't

If you combine any two of the above words in the same idea, your sentence will be positive (the opposite to what you intended).

Negative + negative = positive. So only use one negative word in a sentence when you want to say that something is negative.