None of your business - nothing to do with you. Don't ask about things that do not concern you. 不要愛管閒事, 沒有你的事
Her actions are her own, it's none of your business. 她要做的是她的事，與你無關。
What John decides to do does not concern you. It's none of your business. John決定要做得是與你無關，不要愛管閒事.