whether和if的用法分析

来源:分析材料 发布时间:2021-04-21 点击:

  语法是在学习英语中的一个基础,基础的东西会为了我们打造一个更好的更好的学习效果,那么关于whether和if在语法中的用法是怎么样的呢?以下是小编给大家整理的whether和if的用法分析,希望可以帮到大家

  whether和if都可以引导宾语从句,表示“是否”,在口语或间接引语中两者可以互换使用。如:

  I wonder if / whether I can get some advice from you.

  Ask him whether / if he can come.

  但在有些情况下,whether和if的用法有一定区别。

  1. whether引导的从句常可以与连词or或or not直接连用,而if一般不能。如:

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

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

  2. 当宾语从句提到句首时,只能用whether引导,而不能用if。如:

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

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

  3. whether可以引导带to的不定式,if则不能。如:

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

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

  4. whether及其引导的成分可放于介词之后,作介词的宾语,但if不能。如:

  正: I worry about whether I hurt her feelings.

  误: I worry about if I hurt her feelings.

  5. whether可以引导从句,作主语、表语或同位语,而if不能。如:

  正: It was uncertain whether he would come.

  误: It was uncertain if he would come.

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

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

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

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

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