is it going to rain tomorrow? if it __,we 'll have the mach tomorrow.填does为什么?
问题描述：
is it going to rain tomorrow? if it __,we 'll have the mach tomorrow.填does为什么?
答
does代替rains这个动词.用does是为了避免重复.还有一点,当主句是一般将来时的时候,if引导的条件状语从句要用一般现在时.所以这里不能填will do或is going to do.