大家好，我是小十，我来为大家解答以上问题。before的用法，before很多人还不知道，现在让我们一起来看看吧！

1、before-副词 前 before, ago, forward, in front, earlier on 以前 before, formerly, back 面前 before, in front of 以往 in the past, before, formerly 从前 before, previously, formerly, in the past 先前 previously, before 曾经 once, already, before, at some time in the past 曾 once, before, already, at some time in the past 在先 before, formerly, in the past 早先 previously, before 先头 ahead, before, formerly, in front, in the past, in advance before-介词 之前 before 以前 before 以往 before 往时 before before-连词 在 ... 以前 before, ere。

本文到此讲解完毕了，希望对大家有帮助。