I don't know if he will ___(come)back.If he___(come)please tell me

问题描述:

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...