whether or

基本解释

Many have begun it. I do not yet know whether or not they kept to it.
許多人都有開始在研究，但至於他們是否能夠堅持下去，卻非我預料所及的了。
But I do think it is time to reevaluate the things I do have and whether or not they add any value to my existence.
但是我的確認爲是時候去從新評估這些我所擁有的物品的價值了，看看它們是否因爲我的收藏而增值。
You should know your team well enough to know whether or not something like that would be positive reinforcement for them.
你必須對自己的團隊有很好的了解，要弄清楚對於他們來說類似的東西是否真的可以起到正曏強化的作用。

"We have no choice," he said, "as to whether or not we will play a great part in the world.
We can't help understanding. We always already understand, which has nothing to do again with whether or not we're right or wrong.
我們控制不住地去理解，我們縂是已經理解了，這與對錯無關。
耶魯公開課 - 文學理論導論課程節選
So can be changed slightly, depending on tense, past, present or future as well as whether or not you want to ask a question.
因此這個句型要根據不同的時態，如過去時、現在時和將來時，作出一點調整；另外也會根據是否是問句而略有不同。
There is 課堂 - SpeakingMax英語口語達人

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