whether or not的用法总结初中

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

问题是，他对局势是否了解。

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。

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

这一想法能否付诸实践还有待于观察。