你来之前我就已经完成了我的工作。

I had carried out my work before you arrived.

youdao

你来之前，我们已经打扫完了房间。

We had cleaned the room before you came.

youdao

你来之前先通知我，真是考虑得很周到。

It was thoughtful of you to warn me of your arrival.

youdao

This is boring. In fact, you can do some nice things to prove what is the class of functions you can compute with straight-line programs, and what you'd see if you did that is, it's not particularly interesting.

这很无聊，实际上，你可以通过做一些很有趣的事情,来证明你可以通过直线程序,来做很多功能，但是你也看到我们之前讲过的了，这不太有趣。

麻省理工公开课 - 计算机科学及编程导论课程节选

What did you do before coming to this university?

在来这所大学读书之前你在做什么？

图书馆经常人很多 - SpeakingMax英语口语达人

What universities did you apply to before coming here?

来这儿之前你申请过什么大学？

学习化学专业的原因 - SpeakingMax英语口语达人