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

　　問題是，他對局勢是否了解。

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

　　我們盤算著今年冬天是否去滑雪。

　　It remains to be seen whether or not this idea can be put into practice.

　　這一想法能否付諸實踐還有待于觀察。

　　Whether or not we're successful, we can be sure that we did our best.

　　不管成功與否，我們確已盡了最大努力。

　　This blood test will show whether or not you're immune to the disease

　　這個血檢會顯示你是否對這種疾病具有免疫力。