But you have to make sure you have all the information you need before you do.但在簽之前你得確保得到了你需要的所有信息

make sure弄明白； 設法確保

I think the door's locked, but I'd better go and make sure (it is).

我想門已經鎖了，但我最好還是去查看一下。

Make sure that the sign's the right way up.

一定要把符號的上下弄對。

There were a lot of people in Ali's life we didn't know about.艾莉生活中有太多我們不知道的人

know about知道； 了解； 聽說過有關 ... 的情況

I'd love to know about the plan.

我想知道這個計劃。

He's such an ostrich he doesn't want to know about his wife's love affairs.

他真是自己騙自己--對妻子有外遇不聞不問。