虚拟语气大杂烩类别用法例句If引导的条件从句与现在事实相反从句动词：过去式（be用were）主句动词：should/would/could/might+动词原形If he were here, he would help us.与过去事实相反从句动词：had+过去分词主句动词：should/would/could/might +have+过去分词If I had been free, I would have visited you.与将来事实相反从句动词：过去式 / should+动词原形 / were+不定式主句动词：should/would/could/might+动词原形If it should rain tomorrow, we would not go camping.“should+动词原形”类表示“坚持、命令、要求、建议”的demand, suggest, order, insist后接的从句中动词为should+动词原形He suggested that we not change our m
