关于whether与ifI have no idea whether to visit my gra

关于whether与ifI have no idea whether to visit my gra

这个句子只能用whether,不能用if的原因是whether可以引导带to的不定式,if则不能.我详细地列出来,你看看...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.======以下答案可供参考======供参考答案1:后面是to do的话只能用whether供参考答案2:1、引导宾语从句 在引导宾语从句时，whether 和if 通可以互换，在ask,care,doub,know,learn,msee,tell,try,wonder等动词之后尤其如此。例如： I don’t know if/whether I can help you. They don’t care a bit whether my reports are good or bad.. I wonder if you can examine him now.(高一册第十四页) I am not sure if/whether I’ll have time. 但是，必须注意以下几点： 1）如果从句是否定结构，则用if不用whether.例如： Well,think,and see if the most religious people aren’t those who fell that this life doesn’t gice them all they want.好，你想，那最虔诚的宗教徒，是不是就是那此觉得这现实的人生没有完全满足自己欲望的人？ Dinner was almost over when Dan,still looking hungry,grinned and asked Dave if he wasn’t going to have some bread.晚饭快吃完的时候丹（他看上去还没吃饱）笑着问戴维还要不要吃些面包。 I don’t care if he doesn’t show up .他来不来我都不在乎。 Let me know if you can’t meet me at Jackson and Throop Streets Wednesday afternoon at two o’clock.星期三下午奉告警方，你是否能在杰逊街和思鲁街的黑心角来跟我相会。（＜嘉莉妹妹＞＝ 当然，对某些句子，人们可能会有不同的理解。如上面最后两列中的if 也可理解为引导条件状

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