1.在下列情况下一般只能用whether，不用if。 ①在“whether or not”结构中，例如： Harvard refused to tell me whether or not he has finished writing his composition． ②在介词后面时，例如： It’s a question of whether you are fit for the position． ③引导主语从句时，例如： Whether they will win or lose is all the same to me． ④后接动词不定式时，例如： Can you tell me whether to go or to stay? ⑤引导同位语从句说明名词时，例如： The question whether we should have the meeting must be decided right away． ⑥引导表语从句时，例如： My problem right now is whether I should have someone else take the place of me． 4)whoever(whomever)，whatever，whichever相当于anyone who／whom，anything that，any．．．that 。例如： Hunter gave whoever asked for it，a copy of his latest novel． She gave a present to 本文来源：https://www.wddqw.com/doc/30891fbf0b75f46527d3240c844769eae009a321.html