我们不确定是否还要继续减价促销。

We're not sure whether we still want to proceed with the sale.

《牛津词典》

特尔曼设计了一份调查问卷，以协助确定是否需要专家护理。

Terman has developed a questionnaire to help determine whether expert care is needed.

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我们可能确定是否有人正在从那个著名的草地山丘草地上向总统射击。

We'd probably know for sure whether someone was shooting at the president from that famous grassy knoll.

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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。

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