if引导的虚拟条件从句,如果从句表示将来时,动词时态是什么样的

if 引导虚拟语气时候,如果对现在或将来事实虚拟,从句使用一般过去时,主句使用would+动词原形.例如：
If I were you,I would accept his invitation.
当对过去事实假设的时候,从句使用过去完成时,即had+过去分词结构,相应的,主句需使用would/should/might+现在完成时结构,即would/should/might+have/has+过去分词结构.例如：
If the teacher had tought me something about that question,I would have answered it correctly.
不知我这么说是否让你明白了呢?