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Americans are very private in many areas. It would be considered rather intrusive to ask someone in a dating relationship when they will marry.
Don’t worry, when they get married, they will tell you. That type of question is rather personal. They might not say it to be polite, but they may be thinking “keep your nose out of my business”
So is how much one earns. Someone might say “keep your nose out of my business” if you ask them how much money they make.
We say “keep your nose out of my business” if someone is meddling or interfering in one’s personal matters.
Example: “Keep your nose out of my business. Don’t ask me about that conversation. It didn’t involve you.”
“Don’t ask me my political views. Keep your nose out of my business.”
It is my business to ask you to attempt a sentence using “keep your nose out of my business“. But I hope I am not intruding when I ask you to tell us how to say “keep your nose out of my business” in Chinese!