询问下虚拟语气的问题If they didn't leave,they wouldn't be able to catch the train.这是一个真实条件句,但是对于时态的使用我一直很疑惑,为什么这里条件句用did而不用do,主句用would而不用will?请详细解

if的虚拟语气 询问下虚拟语气的问题If they didn't leave,they wouldn't be able to catch the train.这是一个真实条件句,但是对于时态的使用我一直很疑惑,为什么这里条件句用did而不用do,主句用would而不用will?请详细解 as if 的虚拟语气? if引导的虚拟语气怎样解释 虚拟语气as if 的用法? 虚拟语气if的三种用法 虚拟语气,对将来的,if they were to do,否定是if they were not to do嘛 求if、only if 、as if虚拟语气的用法? 求if的虚拟语气用法,需要怎样注意时态的问题, 关于as if 的虚拟语气as if 虚拟语气中的be 动词一定要用were 虚拟语气倒装,对将来的,if they were to do是were they to do,对现在的,if they did是did they do 关于句子结构和虚拟语气的问题The atomic structure is,___________ ,a miniature solar sysstem.a.as it were b.as if they were c.as if it were .d as if are请问：1请分析一下句子结构．2.这句话是不是虚拟语气? If only 的句型用虚拟语气吗?虚拟语气的时候又是什么样的 除了if于wish引领的虚拟语气句外虚拟语气的具体用法 if 从句和虚拟语气 虚拟语气 条件状语的区别If it rains tomorrow ,i won't goif it rained tomorrow,i wouldn't go.哪句是虚拟语气,哪句是条件状语,什么情况下用虚拟?什么情况下用条件状语? if only虚拟语气if only引导的是虚拟条件句还是主句? 押韵的英文诗if开头用虚拟语气