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
例句:
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.
例句:
My computer broke and I lost my essay. I need to start from scratch tonight. 我的電腦壞了,所以我的文章沒了.我今晚需要重新(開始)再寫一遍。
Our manager changed his mind, we need to start from scratch on this project. 我們的經理改變了他的主意,我們這計畫要從新開始.