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

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

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,...

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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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