事前的英文：
before the fact

pre - audit of requisition
请求书的事前审计

Sorry to Bother you.
抱歉打扰你[事前]

Without an opportunity for previous inspection
事前未得以检查

Notify them in advance.
事前跟他们打个招呼。

It is better to be safe than sorry
事后追悔不如事前稳妥

I will make a partial payment in advance.
我会事前付一部分定金。

I have been informed beforehand.
我事前曾接到通知

The afterthought is good, but forethought is better.
事后回想有益，事前考虑更佳。

The afterthought is good,but forethought is better.
事后回想有益，事前考虑更佳。

The key is to seek expert opinion before the die is cast as what is done cannot be undone.
听取意见最好在事前，不要在事后。

Rain before seven;fine before eleven
雨过天晴

They corned their horses before the journey.
他们在启程前用玉米喂马。

The army was arrayed before the commander.
部队在指挥官前列好阵势。

see before you go
三思而行

Bind the sack before it be full
做事应适可而止