whether or not 引导疑问句可以这样说吗?

问题描述:

whether or not 引导疑问句可以这样说吗?
whether or not has the Lotus root been sliced up?
有语法错误吗?

还不如直接说,Has the lotus root been sliced up?
如果要用whether or not 的话,前面最好加一句,比如,
I wanna know whether or not the lotus root has been sliced up.