before后面跟什么

before作介词的时候，后面可以跟名词、代词、动名词；before作连词的时候，后面可以跟时间状语从句。

before后面跟名词
(www.ws46.Com)

例句：So it's happened before, and it will happen in the future.

这样的事情在以前发生过，在将来还会发生。

before后面跟代词

例句：Tom is standing before me.

汤姆就站在我面前

before后面跟动名词

例句：You mustn't hang out before finishing your assignment.

在完成任务之前，你不能出去玩。

before后面跟时间状语从句

例句：They had never seen so many of the locusts before.

他们以前从未见过如此多的蝗虫。

before常用搭配

before and after前后，之前之后

例句：They also had talk therapy with a nurse before and after quit day.

他们还在戒烟日前后与一名护士进行了谈话治疗。

than before比以前

例句：Financially ， I 'm much better off than before .

我 的 经济 状况 比 过去 好多 了。

as before如以前

例句：The next day the children were as badly behaved as before.

第二天，孩子们还是像以前一样顽劣。