I don’t know ___________ he is well or not.whether/if,为什么?

I don’t know ___________ he is well or not.whether/if,为什么? I don’t know whether he likes the movie or not中的or not 能不能去掉 He is very busy.I don't know if he will come or not tomorrow I don't know whether you will believe or not if i say i love I don't know whether it is true 【or not】.加不加 or not 有什么区别? i don't know whether it will rain or not .but if it __.i sha I don't know______or not.A.whether he is at home B if he is I don't know whether he is for or a___ my plan. I don't care whether he is _____ the plan or not . I don't care whether he is( )the pian or not I don't know < >he will come tomorrow or not 括号中该填whether还是i I don't know whether he is w___ to come