Our teachers believe that if we did that,we would concentrate more on our studies

问题描述:

Our teachers believe that if we did that,we would concentrate more on our studies
这个句子是if引导的条件状语从句,为什么还用过去式

虚拟语气.
对现在的虚拟:if从句用过去时,主句用would / could / should / might +do .
意思是老师相信如果我们做了,我们会更专心于学习.(实际没做)