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<正> If一词看来简单,可用法却有点复杂,现就其用法探究如下:一、引导宾语从句,(=whether)意为“是否”。e.g.I.I wonder if he is at home.2.Ask if he can come.可与will或would连用。e.g.I.I’d like to know if he will be here again.