你好宾语从句中,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,再口语中多用if一般情况下,if和whether可以互换,单以下几种情况只能用whether:1、再不定式前:Whether to go there or not hasn'tbeen decided.2、在介词前:It depends on whether it is going to rain.3、在选择疑问句中:They are talking about whether to go there or not.4、 当宾语从句提到句首时:Whether it is true or not,I can’t tell.5、少数...