Questions & Answers about Bạn có muốn uống thêm cà phê không?
In Vietnamese, yes/no questions are typically formed by adding a question tag such as không at the end, much like adding “right?” or changing intonation in English. It signals to the listener that you expect a yes/no answer:
• Bạn ăn rồi không? = “Have you eaten yet?”
• Bạn có muốn… không? = “Do you want…?”