Cách sử dụng
The expression "no sir!" is a polite way to refuse or reject something that someone is offering or suggesting to you. It is often used in formal settings or when speaking to someone in a position of authority, such as a boss or parent. It shows respect while still firmly declining the offer or suggestion. For example, if a teacher offers you a piece of candy during class, you could politely decline by saying "No sir, thank you."