If you don't want to sound impolite, or cause embarrassment or distress of any kind to the person you're talking to, you should learn to use tactful and tentative forms in your English.

如果你不想听起来不礼貌，或对与你谈话的人造成任何形式的尴尬或窘迫，你应该学会在你的英语中使用委婉试探性的话语。