I don't know when he ____ back tomorrow.Don't worry,I 'll call you when he____ back.will come,comes.求说明.

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I don't know when he ____ back tomorrow.Don't worry,I 'll call you when he____ back.will come,comes.求说明.
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I don't know when he ____ back tomorrow.Don't worry,I 'll call you when he____ back.will come,comes.求说明.
I don't know when he ____ back tomorrow.Don't worry,I 'll call you when he____ back.
will come,comes.求说明.

I don't know when he ____ back tomorrow.Don't worry,I 'll call you when he____ back.will come,comes.求说明.
I don't know when he __back tomorrow.
I don't know 是主句
因为know 是及物动词,所以　when he __back tomorrow 其实是一个宾语从句.根据时间状语tomorrow,我们知道这句话表示将来时态.所以第一个空填 will come.
我不知道他什么时候回来.
第二句话的意思是,当他回来的时候我会给你打电话.I will call you是主句,when 引导的是个时间状语从句.时间状语从句的原则是“主将从现”即：主句用一般将来时,从句用一般现在时表示将来.所以,when 引导的时间状语从句中用 when he comes back 而不是will come back.

第一句tomorrow是明天，将来时候，当然用will come
第二句 when引导的时间状语从句 记住四个字 主将从现
也就是主语将来时，从句就用现在时 所以用comes
主将从西现的还有 if 这个词
这是考点。。。。请牢记

will come, comes
第一个空是when引导的宾语从句，做know的宾语，when翻译为“何时”；
第二个空是when引导的时间状语从句，when翻译为“当......”。
注意看清句子意思再做题。

第一空考查宾语从句中时态，表将来，用一般将来时。
第二空考查时间状语从句中时态，从句要用一般现在时表将来。

前一空，因为有时间状语tomorrow， 所以要用will come，一般将来时， 后一空，为时间状语，主将从现，用comes ，一般现在时，同样的还有If引导的条件状语从句

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