If you want to see the movie this evening.so will I为什么不是do?

If you want to see the movie this evening.so will I为什么不是do?
If you want to see the movie this evening.so will I为什么不是do?

If you want to see the movie this evening.so will I为什么不是do?
条件状语从句是用一般现在时表将来,而主句中正用一般将来时.“主将从现”.

If,引导的条件状语从句主句用一般现在是从句用一般将来时
you want to see the movie this evening是从句，用want
so will I是主句所以疑问词用will

这是will的特殊用法！！像这样的还有would，shall等这些单词不再是简简单单的字面意思，不同的语境用法不同！！！你可以买本语法书看看！！！！