(used especially in reporting questions and expressing doubts) if, or not

I wasn't sure whether you'd like it. 我拿不准你是否喜欢它。

She asked me whether I was interested in working for her. 她问我是否有兴趣为她工作。

I'm wondering whether to have the fish or the beef. 我正在考虑是吃鱼还是吃牛肉。

I doubt whether it'll work. 我怀疑这是否能起作用。

I was merely questioning whether we have the money to fund such a project. 我只是想问问我们有没有钱来资助这样一个项目。

It all depends on whether or not she has the time. 这完全取决于她是否有时间。

Anyway, it's a good story, whether or not it's true. 不管怎么说，这是一个不错的说法，无论它是真是假。

(used to introduce two or more possibilities) it is not important if

I'm going, whether she likes it or not. 不管她高不高兴我都要走。

Someone has to tell her, whether it's you or me. 总得有人告诉她，不论是你还是我。

Let's face it - you're going to be late whether you go by bus or train. 让我们面对现实吧——不论你是乘公共汽车还是火车，都要迟到的。