送哦夏季
之所以是虚拟语气，那就说明语气所表达的是与事实相反的。时态通常是在相应的时态下往前推一个时态。例如：主句是现在的虚拟，那么从句就用一般过去时；主句是过去的虚拟，那么从句就是过去完成时或者过去将来时。例如：I would go out now if it were fine.I would have gone out if it had been fine.It seems as if it were snowy.It seemed as if it had been snowy.亲：祝你学习进步，每天都开心V_V！望采纳，thx!
triangelrain
1、表示与现在事实相反的假设：从句：if+主语+were或动词过去时；主句：主语+should/would/could/might+动词原形。2、与过去事实相反的假设：从句：if+主语+had+过去分词；主句：主语+should/would/could/might+have+过去分词。3、表示与将来事实相反的假设：从句：if+主语+should/were to/动词过去时；主句：主语+should/would/could/might+动词原形。虚拟语气是一种特殊的动词形式，用来表示说话人所说的话并不是事实，而是一种假设、愿望、怀疑或推测。 虚拟语态 虚拟语气这一语法项目是各类英语考试中心测试的重点之一。虚拟语气是一种特殊的动词形式，用来表示说话人所说的话并不是事实，而是一种假设、愿望、怀疑或推测。 用以表示虚拟条件的虚拟语气 用if条件从句表示的虚拟条件，是虚拟条件最普通的方式。 ①虚拟现在时表示与现在事实相反的假设，其if从句的谓语形式用动词的过去式(be一般用were)，主句用would/should/could/might+动词原形，例如：If I were in your position I would marry her. ②虚拟过去时是表示与过去事实相反的假设，if 从句的谓语形式用过去完成时即had＋过去分词，主句用would/should/could/might + have +过去分词，例如：If it had not rained so hard yesterday we could have played tennis. ③大多数的虚拟条件句属于上面三种情况的一种，但并不排除存在条件和后果中，一个和现在情况相反，另一个和过去情况相反，例如：If you had followed what the doctor said,you would not have been so painful now.这个句子在高中出现频率颇高。 ④但是，如果后果用了虚拟语气，而条件却用陈述语气，这种用法是错的。 用虚拟形式，但包含without等短语的句子，谓语动词未必一定要用虚拟语气。
北京陆少
虚拟语气用在一般现在时，从句IF+S+一般过去时,主句S+SHOULD/WOULD+V例子：IfIstayedinthatschool,Iwouldpasstheexam.虚拟语气用在一般过去时，从句IF+S+过去完成时，主句S+SHOULD/WOULDhavedone例子：Ifyouhadbeenhereyesterday,youwouldhavemethim.虚拟语气用在一般将来时，从句IF+S+was/weregoingtodo,主句S+SHOULD/WOULD+V例子:ifitwasgoingtorain,wewouldn'tgoonapicnicthisSunday.
