1,I have finished my dissertation before my supetvisor went abroad.

在我的導師出國之前，我已完成了我的學位論文 .

2,It may be many years before we meet again 可能要過許多年，我們才能再見了 .

A man stood before him.

一個人站在他面前。

2.

Prepare the night before.

在前一天晚上做好準備。

3.

Have we met somewhere before?

我們以前見過面嗎？

4.

It was hard enough before.

這之前已經夠難了。

5.

Before you panic, read on.