Are you sure he's not two-timing you?

你肯定他没有背着你另有所爱？

《牛津词典》

Make sure that you are not underinsured.

确保你的保险是足额的。

《柯林斯英汉双解大词典》

Make sure you are not out of pocket for your expenses.

你要确保别把日常开销的钱都花没了。

《柯林斯英汉双解大词典》

You know,the circulation, and the smell of your own panic, you know, when you're not sure what to do."

VOA: special.2010.07.26

Because,you know,you can't trust me,and so you have to check me out and make sure I'm not lying to you.

因为你不能相信我,你要弄清楚我是否对你们撒谎了。

耶鲁公开课 - 新约课程节选

You want to... you're not sure if you're going to read something that's related to literature, or to science,

你想要……你不确定是读点跟文学相关的还是读点跟科学相关的内容。

How many课堂 - SpeakingMax英语口语达人

If you are not sure whether you can access the internet on your device, check with your mobile network provider.

BBC: News on your mobile

If you're not sure whether you have or not then you need to check.

BBC: Fergus Muirhead

You were not sure what would happen next, but you read the paper.

FORBES: Wealth Blossoms Not By Beating The Market But Joining It