文法解析
本課主要複習用if取代whether的用法。
1.

First, you should ask if it is a formal or casual party.

= First, you should ask whether it is a formal or casual party.

首先, 你得問清楚它是個正式或非正式的派對。

上列句中, if引導的名詞子句作其前及物動詞ask的受詞。whether引導的名詞子句若作及物動詞的受詞時, whether可用if取代, 此時if譯成『是否』, 而非『如果』。

: I don't know whether I'm right or not, but that's my
    opinion.

   = I don't know if I'm right, but that's my opinion.

   (我不知道自己對不對,但那是我的看法。)

    if取代whether, 通常不與or not並用。

 

注意:

1. whether引導的名詞子句作主詞為虛詞it取代時, 此時whether亦可用if代替。

: Whether the jury's decision was right or not is still
   debatable.

   = It is still debatable whether the jury's decision was right
   or not.

   = It is still debatable if the jury's decision was right.

   (陪審團的判決是否正確仍有待商榷。)

: If the jury's decision was right is still debatable. ()

 

2. whether引導的名詞子句若作介詞的受詞時, 此時whether不可被if取代。

: Our departure depends on if the weather will clear up
    tomorrow. (
)

  Our departure depends on whether the weather will
   clear up tomorrow. (
)

   (我們何時動身要看明天天氣是否會放晴而定。)

 

3. whether引導的名詞子句若置於be 動詞後作主詞補語時,
   
whether亦不可用if代替。

: The question is if the boss will approve this idea. ()

  The question is whether the boss will approve this idea.
      (
)

   (問題是老闆是否會同意這個點子。)

 


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