W: I don't know. Where did you leave it?
我不知道。你把它放哪了？

M: I just put it on the chair a while ago, but now it's gone.
不久之前我把它放在椅子上了，但是现在不见了。

W: Are you sure?
你确定吗？

M: Of course, I am sure. I bet someone stole it.
当然，我确定。我敢肯定有人偷了它。

W: Well, you should have kept an eye on it.
额，你本来应该看管好它。