中考英语重要短语的用法及区别:whether,if
这两个连词都作“是否”解,引导宾语从句时,两者通常可以互换。
但在下列几种情况下,不可用if 代替whether。
1)当whether 与or not连成词组时。
I don't know whether or not they will come for our help.我不知道他们是否来帮助我们。
2)whether 用在不定式前面时。
She hasn't decided whether to go or not.她还没有决定去还是不去。
3)whether引导的从句放在句首时。Whether this is true or not,I can't say.这是不是真的,我不说(或我说不准)
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