or后面的动词形式是什么 whether

动词是动词原形，例如：

1、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。

2、The question arises as to whether or not he knew of the situation.问题是，他对局势是否了解。

3、Whether or not we're successful， we can be sure that we did our best.不管成功与否，我们确已尽了最大努力。