when 和 if 的区别

when 和 if 的区别 when和if的区别用法. if和when的区别在_____ the traffic lights turn green,you can go across the street.中田填if还是when?if和when有什么区别? though和although和 even if的区别 以及when和while的区别 if和when在宾语从句和状语从句中时态的区别 if only 和only if 的区别 if such 和 if so 的区别 if和weather的区别? whether和if的区别 if any ,if so ,if anything 的区别和用法. While和When的区别? when和while的区别 when和while的区别 when和while的区别 when和as的区别 as 和when 的区别 as和WHEN的区别 during和when的区别