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whether和if的用法分析

天下 分享 時間: 瀏覽:0

  語法是在學習英語中的一個基礎,基礎的東西會為了我們打造一個更好的更好的學習效果,那么關于whether和if在語法中的用法是怎么樣的呢?以下是小編給大家整理的whether和if的用法分析,希望可以幫到大家

  whether和if都可以引導賓語從句,表示“是否”,在口語或間接引語中兩者可以互換使用。如:

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

  Ask him whether / if he can come.

  但在有些情況下,whether和if的用法有一定區(qū)別。

  1. whether引導的從句??梢耘c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于介詞之后,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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