虚拟语气would可不可以随意换成could

虚拟语气would可不可以随意换成could 虚拟语气中的should和would可不可以省略?如题 虚拟语气 would 与 could 区别虚拟语气有种是IF ONLY开头的 比如这句：If only the rain would stop.（但愿与能停）1.我想用I wish that the rain would stop.2.还有就是would可不可以换成could?3.要是能,那请问这两 would rather虚拟语气用法? would rather虚拟语气用法? 虚拟语气should可不可以用shall? would rather 是用语虚拟语气吗? would rather 怎么区分是不是虚拟语气 虚拟语气只用would不用had? 关于虚拟语气中的从句~在虚拟语气中,与将来事实相反主句用would/could/should/might do从句用were to 或should do .从句should do中的should能换成would/could/might吗? 问一点虚拟语气的问题~虚拟语气中should和would有什么区别啊~ If the situation become badly ,a serious problem may come up 这不是虚拟语气吗 may是不是应该换成would才对? 虚拟语气 虚拟语气中（should would could）应该怎么选择? would rather后面为什么要用虚拟语气?如何用? would rather 后接虚拟语气的用法 虚拟语气中'd怎么区别是had还是would? That would be very interesting 是虚拟语气吗