內容簡介
引導詞 “if” 既可以表示 “如果”，也可以表示 “是否”。在表示 “是否” 的意思時，有時 “if” 和 “whether” 可以互換使用。這就難倒瞭一些英語學習者 —— 什麼時候該用 “if”？什麼時候該用 “whether”？主持人 Sam 總結瞭兩個規則，幫助你判斷到底是用 “if” 還是 “whether”，看視頻。
文字稿
When do we use if and when do we use whether? Let’s take a look.
The simple rule is that with conditional sentences we use if, and when we have two options, we use whether.
If I get hungry, I’ll have a snack.
But I don’t know whether to have an apple or a biscuit.
When asking an indirect yes/no question, we can use either if or whether – both are correct.
Do you know if the apples are fresh?
Do you know whether the biscuits are any good?
Whether is maybe a little bit more formal, but with both questions there are only two possible answers – yes or no.
用法總結
1. 條件句中，用 “if” 表示 “如果”, 不能用 “whether”。
- If I get hungry, I’ll have a snack.
- I’ll take an umbrella if it rains.
2. 陳述句中提及兩種選擇時，常用 “whether”。
- I don’t know whether to have an apple or a biscuit.
- I can’t decide whether to go home or not.
3. 間接一般疑問句中，“if” 和 “whether” 都適用，同樣表示 “是否” 的意思。“Whether” 更正式一點。
- Do you know if the apples are fresh?
- Do you know whether the biscuits are any good?
- Can you tell if it’s going to rain today?
- Can you tell whether it’s going to rain today?
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