before

The new road should be completed before the end of the year..这条新公路应该在年底前完工。

Let’s meet at our house before the show..看演出前在我们家碰头吧。

Larry arrived home before me..拉里在我之前到家。

We only got back from Scotland the day before yesterday (= two days ago ) ..我们前天才从苏格兰回来。

Other students joined in the protest, and before long (= soon ) there was a crowd of 200 or so..其他学生也加入了抗议队伍，不久就有200人左右了。

before and after,前后，之前之后

than before,比以前

as before,如以前

before long,不久以后

ever before,以前；从前

than ever before,比以往任何时候更…

from before,从…以前

go before,居先；走在前面

on or before,截至；在或在…以前

before all,尤其，特别