I'm not sure about it .

我对这不确定。

youdao

'I'm not sure about it,' he said weakly.

“这我说不准。”他支吾说。

《牛津词典》

I'm not sure about it.

我不肯定。

youdao

The spokeswoman says if you get an e-mail you are not sure about, forward it or send a separate message to ContactETS@ets.org.

VOA: special.2010.02.18

What could you say for sure about it?

哪一点你们比较确定

耶鲁公开课 - 聆听音乐课程节选

OK, important -- if you are part of this group here think about it and make sure you understand that.

好的，这很重要，如果刚才你选了可逆过程,请好好想想并且保证已经理解了这个问题。

麻省理工公开课 - 热力学与动力学课程节选

The author, Walter Isaacson, was never quite sure about it.

FORBES: Truly Terrible Title Of Authorized Steve Jobs Biography Changed

It worked for her rendition of the song I Love New York, but I wasn't so sure about using it for Ray of Light, which is such a dance track it seemed odd to watch her strumming a guitar for it.

BBC: NEWS | UK | Wales | Confessions from a Madonna show

And this is the key point: it is not about dropping school accountability altogether, but about making sure it does not obstruct teaching and learning.

BBC: Signs of a turning tide on tests