i don't konw if or not he likes my MP4 player 哪里错了?

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i don't konw if or not he likes my MP4 player 哪里错了?
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i don't konw if or not he likes my MP4 player 哪里错了?
i don't konw if or not he likes my MP4 player 哪里错了?

i don't konw if or not he likes my MP4 player 哪里错了?
if 改为whether.
whether和if常用来引导宾语从句,这时两者的含义区别很小,一般可通用.例如:
①I don't know whether/if they will come to help us.我不知道他们是否来帮助我们.
②I am not sure whether/if I'll have time to go with you.我很难说我们是否有时间跟你们一起去.
上面两句无区别.但是,当whether与or not连成一个词组时,whether不可换用if.例如:
I don't know whether or not they will come for our help.我不知道他们是否要来求我们支援.