whether or not
是分开使用的。
引导主语从句,并且该从句放句首时：
Whether the pop star will come (or not) is not decided.
举例：
Whether you realize that or not.
不论你认识到没有。
I will pick it up to have a look whether it's worth or not.
我会捡起来看它是不是真钱。
whether he can come or not is a mistery.
