Короче говоря, "It`s none of your business",-переводится как :"Это не твоё дело."

it's noun of your business Correction: It's none of your business It often means "I will not answer you." For example someone asks George a personal question that he does not want to answer, he can reply "it's none of your business". It is a somewhat rude way of telling someone that you will not answer their question and that you feel that person should have never asked the question.

it is none of your business = it does not concern you My private life is none of your business.

it's none of your business - переводится как "это не твое дело" (в духе Отвали это тебя не касается)

Thank you, Lucas)