Does he come from Japan?Do you know?Do you knowhefrom Japan?

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Does he come from Japan?Do you know?Do you know____he____from Japan?
Does he come from Japan?Do you know?
Do you know____he____from Japan?

Does he come from Japan?Do you know?Do you know____he____from Japan?
whether/if comes

Do you know does he come from Japan?

if comes

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Do you know wheher he comes from Japan?
1.if作“是否”讲的时候，与whether同义，都可引导宾语从句，可以互换
2.口语中常用IF，但是从句中有OR NOT 的时候，则只能是用WHEATHER，例如：I don‘t know whether it’s raining or not.
3.另外，WHETHER可以引导主语从句，表与从句，同位语从句，IF 则不能，IF（意为“如果“）可以引导条件状语从句，WETHER则不能，WETHER可以和不定式连用，IF 则不能。He doesn‘t know whether to accept the invitation.
4.WHETHER引导的宾语从句可以放在介词后面，IF引导的宾语从句则不能。例如：
It depends on whether he is coming。

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