You know, mind you: … đó / đấy at the end

Add đó to the end of a statement to point the listener at it, a bit like "you know", "mind you" or "look". It turns plain information into something you want them to notice: Phở ở đây ngon lắm đó. The phở here is really good, you know.

Use it to pass on news someone should act on, or to warn them: Anh Minh tới rồi đó. Minh's here now. Cẩn thận, nóng đó! Careful, it's hot! Trễ rồi đó (it's getting late) usually means "so let's go".

It's casual and friendly. With someone older, add their word at the end: Nóng đó chị.

In Hà Nội the word is đấy: Muộn rồi đấy. Young people in Hà Nội also end sentences with ấy, a light "you know". In Saigon, say đó.

Đó is also the word for "that" (cái đó, that thing). At the end of a question it does a different job, softening the question like vậy: Ai đó? Who's there?