I have no idea _when___he will come back.(whether可以吗?如果可以那if呢?)

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I have no idea _when___he will come back.(whether可以吗?如果可以那if呢?)

都可以
用when表示he一定会come back,只是when的问题
用whether表示he是否come back不一定,回或不回各占一半
用if和whether差不多,但更倾向于回

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