Nor: Adverb that adds a denial to another former or an unconvincing, inconvenience or adverse circumstance. For example: I don't want to go and you either. It is so stupid that it deserves two milks. Well, it isn't so. So little are two adverbs comparative one and another amount or a comparative adverb and an adjective that entail a second term led by the conjunction than to a clause. For example: the change was so insignificant that nobody noticed it. He drank so little he was dehydrated. A very simple system to know if we have to write it together or separately is to replace it with so little. If we can, it is separate.