I don’t know whether he likes the movie or not中的or not 能不能去掉,or not 与whether 有何区别

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I don’t know whether he likes the movie or not中的or not 能不能去掉,or not 与whether 有何区别
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or not 不是必须加的,这句话完全可以写成I don’t know whether he likes the movie.复旦大学出的权威语法书上说:当后面紧跟or not时,例如:we didn't know whether or not she was ready.此时只能用whether.但是!...