Examples

保险单中的保险利益是一种不确定的利益。

The benefits included in an insurance policy are uncertain. → 保险单

I'm not sure you'll ever get Marc's agreement to your proposal.

我不确定你的建议能否得到马尔克的认同。 → agreement

it's a virtual certainty/impossibility

这实际上是件已确定的事/不可能的事 → virtual

George offered me a job as a translator, but I'm not sure whether I will accept it or not.

乔治给我提供了一份做翻译的工作，但是我还不确定是否接受。

I'm not sure if he's dead or alive, I'll check it out.

我不确定他的生死，但要查个水落石出。 → alive

I'm not altogether sure your idea will work.

我不十分确定你的主意是否行得通。 → altogether

He gave me a description of the coat he wants, but I'm not sure if I can find it here.

他向我描述了他想要的那件大衣，但我不确定能否在这儿找到。 → description

Whenever you aren't sure what's the right thing to do, stop and think!

一旦不确定怎么做才是对的，就停下来想想！

I wasn't sure what the right thing to do was.

我不确定该做什么才是对的。