if/whether 是否

I wonder if he is at home.

I ask him whether he would come.

注意：只可以用whether的情況

介詞后面 It will depend on whether it rains tomorrow.

whether···or not 固定搭配 Let me know whether you come or not.

動(dòng)詞不定式前 I don’t know whether to accept his advice.

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