摘要: 连词if .whether.它们起连接作用.在从句中不作句子成分.作“是否 解.在口语中多用if. eg. Tom don’t know if/whether his grandpa liked the present. He asked me whether or not I was coming. 一般情况下.if 和whether可以互换.但以下3种情况只能用whether: ①在不定式前:Whether to go there or not hasn’t been decided. ②在介词前:It depends on whether it is going to rain. ③与or not连用:They are talking about whether to go there or not.

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