（9）表示不肯定Stating Uncertainty
Maybe.
也许吧。
That's possible.
或许吧。
It could be.
有可能。
I'm not sure.
我没有把握。
I can't be sure.
我不能肯定。
It's hard to say.
很难说。
It's up in the air.
尚未确定。
I really couldn't tell.
我确实无法断定。(https://www.daowen.com)
Ihaven't got a clue.
我一点都不清楚。
Ihave no clue.
我一点都不清楚。
I can't say for certain.
我说不准。
I'm not too sure about it.
这事我不太有把握。
Ihaven't got the slightest idea.
我一点都不知道。
Iknow nothing about it.
我一无所知。
There's still some doubt inmymind.
我依然心存疑虑。
I'm afraid that I can't be too certain about it.
恐怕此事我不能肯定。