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  • 賓語從句中WHETHER和IF的區(qū)別

    賓語從句中WHETHER和IF的區(qū)別
    英語人氣:221 ℃時間:2019-12-16 23:37:56
    優(yōu)質(zhì)解答
    whether和if都可以引導(dǎo)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(dǎo)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(dāng)賓語從句提到句首時,只能用whether引導(dǎo),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(dǎo)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(dǎo)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(dǎo)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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