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  • 1 # 狗小花捲

    whether和if的用法有一定區別.

    1.whether引導的從句常可以與連詞or或or not直接連用,而if一般不能.如:

    正:Let me know whether you can come or not.

    誤:Let me know if you can come or not.

    2.當賓語從句提到句首時,只能用whether引導,而不能用if.如:

    正:Whether it is true or not,I can’t tell.

    誤:If it is true or not,I can’t tell.

    3.whether可以引導帶to的不定式,if則不能.如:

    正:I don’t know whether to accept or refuse.

    誤:I don’t know if to accept or refuse.

    4.whether及其引導的成分可放於介詞之後,作介詞的賓語,但if不能.如:

    正:I worry about whether I hurt her feelings.

    誤:I worry about if I hurt her feelings.

    5.whether可以引導從句,作主語、表語或同位語,而if不能.如:

    正:It was uncertain whether he would come.

    誤:It was uncertain if he would come.

    正:His first question was whether Tom had arrived yet.

    誤:His first question was if Tom had arrived yet.

    正:We must consider the question whether we will take these measures.

    誤:We must consider the question if we will take these measures.

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