你是否确定你有回家工作的自律性？

Are you sure that you have the self discipline necessary to work from home?

youdao

中方是否确定了禁运奢侈品清单？

Has China worked out a embargo list on luxury goods?

youdao

公司是否确定它的客户所珍视的东西？

Is the firm certain about what its customers value?

youdao

And he writes, for example, to Mary: "I am moreover undecided whether I ought to continue to hold slaves."

于是他便写给玛丽,比如这段,"我无法确定,我是否该继续拥有那些奴隶"

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Or perhaps, you could be trying to explain that you don't know whether you can do something or not by a certain date.

又或者，你正在试图解释你没法确定你是否能在一个指定日期前做完某件事。

I don't know 课堂 - SpeakingMax英语口语达人

You always want to check your signs at the and because it's so easy to get the sign wrong, and I was hoping that it was right here because I wasn't sure, but it turned out to be right.

我们完成计算时，一定要记得检查符号,因为很容易弄错符号，刚才我就不太确定,是否弄错了符号，检查发现没有问题。

麻省理工公开课 - 热力学与动力学课程节选