i don t know____he has enough money,he will help me or not为什么是whether if哦,给个详解,

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i don t know____he has enough money,he will help me or not为什么是whether if哦,给个详解,
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i don t know____he has enough money,he will help me or not为什么是whether if哦,给个详解,
i don t know____he has enough money,he will help me or not
为什么是whether if哦,给个详解,

i don t know____he has enough money,he will help me or not为什么是whether if哦,给个详解,
在这里不能用if代替whether.
whether ... or not..是固定短语
whether和if都可以引导宾语从句,表示“是否”,在口语或间接引语中两者可以互换使用.如:
I wonder if / whether I can get some advice from you.
Ask him whether / if he can come.
但在有些情况下,whether和if的用法有一定区别.
1. whether引导的从句常可以与连词or或or not直接连用,而if一般不能.如:
正: Let me know whether you can come or not.
误: Let me know if you can come or not.
2. 当宾语从句提到句首时,只能用whether引导,而不能用if.如:
正: Whether it is true or not, I can’t tell.
误: If it is true or not, I can’t tell.
3. whether可以引导带to的不定式,if则不能.如:
正: I don’t know whether to accept or refuse.
误: I don’t know if to accept or refuse.
4. whether及其引导的成分可放于介词之后,作介词的宾语,但if不能.如:
正: I worry about whether I hurt her feelings.
误: I worry about if I hurt her feelings.
5. whether可以引导从句,作主语、表语或同位语,而if不能.如:
正: It was uncertain whether he would come.
误: It was uncertain if he would come.
正: His first question was whether Tom had arrived yet.
误: His first question was if Tom had arrived yet.
正: We must consider the question whether we will take these measures.
误: We must consider the question if we will take these measures