一个人如果对自己掌握的事实没有把握，就绝不该随便批评。

One should never criticize if one is not sure of one's facts.

《牛津词典》

52%的人对这个想法都没有把握。

Fifty-two percent were unsure about the idea.

《柯林斯英汉双解大词典》

理查德对如何最好地向年迈的母亲开口没有把握。

Richard was uneasy about how best to approach his elderly mother.

《柯林斯英汉双解大词典》

Either that you are certain of something, that you are not certain of something,

一种是表达你对某件事情很有把握或者并没有什么把握，

I'm sure 课堂 - SpeakingMax英语口语达人