Of course! … chứ

Put chứ at the end of an answer to say "of course": Có chứ! Of course! Được chứ! Sure! It tells the other person the answer is obviously yes. Said lightly, it sounds warm and willing; said sharply, it can sound like "obviously, why ask?", so keep your tone friendly.

Take the verb from the question and add chứ: Anh có biết quán đó không? Biết chứ! With someone older, add dạ at the start and their word at the end: Dạ, được chứ chị.

You'll also hear Có chứ sao không!, "Sure, why not!", and just Chứ sao!, "Of course!"

Two neighbours look similar. At the end of a question, chứ expects a yes rather than giving one: Mai anh đi chứ? You're coming tomorrow, right? And mà at the end insists after someone has doubted you, like "I told you": Ngon mà! It really is good. Said lightly, chứ is the easy, happy yes. And in the middle of a sentence, chứ không means "not" or "rather than": Em uống trà chứ không uống cà phê. I drink tea, not coffee.