i can't say whether or not he will come on time..他能否准时来,我说不准.whether or not能换成whether吗,两者有什么区别

i can't say whether or not he will come on time..他能否准时来,我说不准.whether or not能换成whether吗,两者有什么区别
i can't say whether or not he will come on time..他能否准时来,我说不准.whether or not能换成
whether吗,两者有什么区别

i can't say whether or not he will come on time..他能否准时来,我说不准.whether or not能换成whether吗,两者有什么区别
基本没有区别,都是可以的 看哪个顺眼用哪个

可以 or not可省略
意思一样

都可以的。也可以说：I can't say whether he will come on time.
I can't say if he wil come on time.