I'm off now, what now? … đây at the end

At the end of a sentence, đây (here) ties what you say to this very moment. Most often it announces that you're leaving: Thôi, em về đây. Right, I'm off. Chị đi đây. I'm going now. You say it as you stand up or pick up your bag; it's the normal, friendly way to take your leave.

It also goes with something you're handing over or showing right now, like "here it is": Cà phê của anh đây. Here's your coffee. In Saigon you'll hear nè here just as often: Cà phê của anh nè.

At the end of a question, đây shows you're wondering or a little worried, asking yourself as much as anyone: Làm sao đây? What do I do now? Tối nay mình ăn gì đây? What shall we eat tonight? It often follows a problem: Mất chìa khóa rồi, làm sao đây?

Compare đó at the end (in Hà Nội, đấy), which points the listener at a fact, like "you know": Trễ rồi đó. It's late, you know. Đây is about you, here and now: Trễ rồi, em về đây. It's late, I'm off.