[正] I don't know where to go.?
[析] where是疑问副词。?
whether ?
[误] It is unknown if he will come.?
[正] It is unknown whether he will come.?
[析] if不能引导主语从句。上句中it是形式主语,其后的从句才是真正的主语从句。要注意以下各种情况不宜用if而要用whether: ?
① I didn't know whether you'll go or not. (因句中有or not选项。)?
② He didn't know whether to visit the old man. (因用于不定式前。)?
③ I'm interested in whether he'll go. (因作介词的宾语从句。)?
④ I want to know the news whether our team will win. (同位语从句。)?
⑤ Let me know whether you can come. (此句如用if则含意有所不同,其意就变为如果你能来请通知我。而用whether则意为让我知道你是否能来。)?
who ?
[误] Whom do you think would like to come for a game of football??
[正] Who do you think would like to come for a game of football??
[析] 在这个句式中do you think应看作插入语,所以原句应为Who would like to come for a game of football??
[误] From who was the gift??
[正] From whom was the gift??
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