1.雨被雪混合。这里的mixed with snow是定语从句，修饰rain，省略了that is，换个说法就明白了：A cool rain that/which is mixed with snow was falling.2.首先这里用了虚拟语气，所以用go的过去式went。went在这里做系动词，表示持续发生的动作或状态，而came(come)和made(make)无此用法。
