I don't know if he will _（come）back.If he_（come）please t

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I don't know if he will ___（come）back.If he___（come）please tell me
答案是will come,comes
为什么是I don't know if he will comes?这里为什么要用将来时?
还有为什么后面那个if引导的句子又不用将来时了?

I don't know if he will 【come】back.If he【comes】,please tell me.
第一个if从句是宾语从句,“他来不来是将来的”,所以用一般将来时；
第二个if从句是条件状语从句,所以用一般现在时表将来.
温馨提示：
条件状语从句和时间状语从句中,动词用一般现在时表将来.

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