1if引导的条件句引导的条件句If she invites me tomorrow,I will go to the party.请把这句话与下面虚拟语气的带条件从句的主从复合句进行比较：If she invited me,I would go to the party.假如她邀请我参加聚会，我就去。If she had invited me yesterday,I would have gone to the party.假如她昨天邀请我参加聚会，我就去了。If she should invite me tomorrow,I would go to the part如果她明天邀请我参加聚会，我会去的。2后退一步法是指后退一步法是指在准确地判断了该句与哪一事实相反后，if引导的非真实条件状语从句中从句中，谓语动词谓语动词按正常情况“后退一步后退一步”。也就是：与过去事实相反，在从句中用过去完成时形式表示与现在事实相反，在从句中用过去一般时形式表示 与将来事实可能相反，在从句中用过去将来时形式表示 主句中主句中则用情态动词would,should,could 等加动词形式 3if条件句中
