The jury is out on whether or not this is true.

这是否属实尚无定论。

《柯林斯英汉双解大词典》

We're debating whether or not to go skiing this winter.

我们盘算着今年冬天是否去滑雪。

《牛津词典》

The question arises as to whether or not he knew of the situation.

问题是，他对局势是否了解。

《牛津词典》

"We have no choice," he said, "as to whether or not we will play a great part in the world.

VOA: special.2010.08.12

We can't help understanding. We always already understand, which has nothing to do again with whether or not we're right or wrong.

我们控制不住地去理解，我们总是已经理解了，这与对错无关。

耶鲁公开课 - 文学理论导论课程节选

So can be changed slightly, depending on tense, past, present or future as well as whether or not you want to ask a question.

因此这个句型要根据不同的时态，如过去时、现在时和将来时，作出一点调整；另外也会根据是否是问句而略有不同。

There is 课堂 - SpeakingMax英语口语达人

"Whether or not he is capable of becoming a head coach is questionable, " Lewis told BBC Radio Wales.

BBC: Scarlets ponder Nigel Davies role

The evidence is not clear on whether or not splitting the role actually helps shareholder value.

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But he argues that change is coming whether or not we're ready for it.

BBC: How are humans going to become extinct?