Have you … yet? (đã) … chưa

To ask whether something has happened yet, put chưa at the end: Em ăn cơm chưa? Have you eaten yet? You can add đã before the verb, Em đã ăn cơm chưa?, which sounds a little more careful. In everyday Saigon speech it's usually left out.

The answers are rồi (yes, already) and chưa (not yet). In a full answer, rồi comes after the verb and chưa before it: Dạ, em ăn rồi. Dạ, em chưa ăn. Don't answer không: it sounds like "no, I don't", not "not yet".

Use chưa when you expect the thing to happen sooner or later. That's why Anh có gia đình chưa? is the usual friendly way to ask whether someone is married: literally, "do you have a family yet?" Có … không asks a plain yes or no, with no "yet" in it.

To ask whether someone has ever done something, as in "Have you ever been to Huế?", add bao giờ before chưa: Anh đi Huế bao giờ chưa? Without chưa, bao giờ asks "when": Bao giờ anh đi Huế? When are you going to Huế?