Double negatives occur when there are two forms of negatives in the same sentence or clause. They es usually have a negative verb, a negative pronoun, a negative adverb or a negative conjunction. They are regarded as non standard usage in formal English. They are very common in informal English.
When there are two negatives in a sentence or a clause, they work like a mathematic equation. They slash each other and the meaning of the sentence becomes a positive one. Here are a few examples:
- I don’t know nothing about computers. ( this means I know about computers)
- It won’t do you no good. (means it will do you good).