引導詞 whether 與 if
I wonder whether/if he will come.
點「複製」把詞條和說明一起拿走。
說明
賓語從句中兩者常可換；但介詞後、句首主語從句、與 or not 直接連用時只用 whether（whether or not）。
同類條目
- 主謂一致：就近原則 —— Either you or he is right.
- 現在完成時 vs 一般過去時 —— I have lived here for 5 years. / I lived there in 2010.
- 定語從句：that 與 which —— The book that/which I bought is good.
- 虛擬語氣：if 條件句 —— If I were you, I would take it.
- 非謂語：doing 與 to do —— I enjoy reading. / I want to go.
- 倒裝：否定詞提前 —— Never have I seen such a thing.
- 比較級：as ... as 與 than —— He is as tall as I am. / He is taller than I am.
- 情態動詞表推測 —— It must be true. / It can't be true.
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