重点

1.not… until…

eg. I won’t leave until you do.

你不走我就不走。

eg. I didn’t leave the house until he came back.

直到他回来我才离开家。

2.happen to 碰巧，偶然

eg. You don’t happen to know his name, do you?

你不会碰巧知道他的名字吧？

eg. Tonight just happens to be a good night.

今晚只是运气好而已。