I'll ask him for my book if he ______(not return)it to me.

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I'll ask him for my book if he ______(not return)it to me.
I'll ask him for my book if he ______(not return)it to me.

I'll ask him for my book if he ______(not return)it to me.
doesn’t return

doesn't return
主将从现。if 从句用一般现在时态

does not return
主将从现

You will make more mistakes if you_(be not)careful,用适当形式填空 A 第一个if表示是否,用一般将来时。第二个if 是条件状语从句,所以从句用