从句若表“是否”时,if,whether 均可以.

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从句若表“是否”时,if,whether 均可以.
特殊问句做宾语,仍用原来疑问词.
帮忙举例说明下,谢．追分

In most cases their functions are the same.The only diffrence is that when you use "whether",you can use the pattern of "whether ...or not".However,when you use "if",you cannot use that pattern.
For examples:
I don't know whether she will come.
or:
I don't know whether she will come or not.
I don't know if she will come.
But,you cannot say:
I don't know if she will come or not.
Besides,sometimes it is not bad to use a different word when too many "if's" are in a sentence.
For an example:
If you are not sure about her decission,why don't you ask her whether she will come to your birthday party or not?
Compare that with the following sentence:
If you are not sure about her decission,why don't you ask her if she will come to your birthday party?

从句若表“是否”时,if,whether 均可以. whether/if（表是否时）引导的从句可以是相对的吗 e.g.whether they would pass the 合并宾语从句时,若从句为一般疑问句,什么时候用if,什么时候用whether? 关于whether与If 引导主语从句时的区别 if和whether后引导宾语从句时为是否,但为什么还可在后面加or not,也翻译成是否,有区别吗英语复合句中的宾语从句的引导词whether是否可以完全替代if? if和whether引导表示“是否”的一般疑问句的宾语从句. whether与or not在句中不相邻时whether是否可以改为if 把下列句子改成以if / whether 引导的宾语从句看到有说：if 或 whether 引导宾语从句时,作“是否”讲,常放在动词 ask、see、say、know 和 fi 宾语从句,whether和if的用法 if、whether引导的从句为真理