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if = 假如,條件副詞子句,不加 will
if = 是否,表示未來時,須加 will
注意:if 置於句首只能表示「假如」,至於句中可表示「假如」或「是否」。
例句:
1、if當作「假如」
If it rains tomorrow, I won't go hiking. (假如明天下雨,我就不去遠足。)
If I were you, I wouldn't do this to him. (假如我是你,我不會這樣對它。)
2、if當作「是否」(名詞子句)
I don't know if he is coming. (我不知道他是否會來。)
I don't care if you go or not. (我不管你去不去。)
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