虚拟语气中主句中的助动词would could should might 怎么选
语法书中的这句话是什么意思 当主句的动作与从句的动作发生时间不一致时,谓语动词的形式要根据 他所表示的时间加以调整 例：If he had set out earlier,he would be home now 如果他早点出发,他现在也该到家了.If I were not busy ,I would have come 假如我不忙,我就会来了 这第二句为什么用了现在完成时