Cách sử dụng
"How do you do" is an old-fashioned way of greeting someone when you first meet them. It's a polite way to say "hello" and to acknowledge someone's presence. You can use it in formal situations, like meeting someone for the first time in a business setting, meeting someone's parents or grandparents, or when attending a formal event. It is not commonly used in everyday conversation or with people you already know well.