if would have done虚拟语气,if主将从现的用法

if would have done虚拟语气,if主将从现的用法

当条件状语从句表示的行为与主句表示的行为所发生的时间不一致，称之为错综时间虚拟语气。我们先来复习一下时态结构一致的情况。时态结构一致：if+从句(did),（此时和migh have done可互换）couldn't have done, ifhad done常常译为“不可能”02could have和would have的区别Could have done表示本来有机会/有

在虚拟语气中，would have done经常以两种结构出现。1. I would have done……but……我本想做……但由于一些原因，没有做成当然特定语境下，but及后边内容会省略2. if虚拟语气IIf虚拟语气中的倒装，有三种情况Had sb done sth,Were sb to do sth,Should sb do sth,1）对过去发生的事情进行虚拟句型为if …had done…would have done sth 汉语：如果我当时

1虚拟语气if的用法1、表示与现在事实相反的情况：从句：If+主语+动词一般过去时(Be动词用were)。主句：主语+ should/would/might/could+do。2、表示与过去事实相反的情况：从句：Iif i had done 是说假设这个事情我确实做了if i would have done 是说假设这个事情在以前会发生，其实根本不可

if,..would表示与现在事实相反的虚拟句，如If I were you, I would go.if would have done表示与过去事实相反，如We would have dropped by if we had had time.理由很简单：would have done 是由have done 虚拟来的，由于这种情况的have done 传递过去事情对现在造成的影响，也就是说would have done 是一个表结果表影响的时态，而if引导的是条

would+have+done虚拟语气（会+已经虚拟语气）The subjunctive mood of would+have+done indicates the hypothesis of what happened in the past, which means that it wouldIf she were to leave, I would have heardabout it. 如果她要走，我早就会听说了。if 条件句是对将来的虚拟，用were to do形式，而主句是对过去的虚拟，用would have done形式) (5)