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changed the plan. I have no idea when she will be back. 主語從句 在另外一個句子中做主語的句子叫主語從句。s a pity that you should have to leave. It is great that I have a teacher like you. whether與 if均為“是否 ” 但下列情況下只用 whether : 1. whether引導主語從句并在句首 Whether he will e is not clear. 2. 引導 表語從句 The question is whether he’ll e. 3. whether從句作介詞賓語 I’m not sure ab