如： If I were you, I would not do that.= Were I you, ...
If he had known you earlier, things would have been better.= Had I known you...
If you should call on her tomorrow, she would be happy.= Should you call on her...
2. 还有一种由be引导的虚拟语气（相当于让步状语从句)，在倒装结构中有时会碰到，be动词提前放到从句句首，形成倒装结构。
如：
I'll come as promised, be it rainy or fine.
不论雨天晴天，我都将如约到来。
Everybody must obey the rule, be he a teacher or a student. 无论是老师还是学生，人人都必须遵守这个制度。
if+主语+had_____had+主语
if+主语+were_____were +主语
if+主语+should___should +主语
虚拟语气时be动词助动词提前表假设有哪几种?
If you should call on her tomorrow, she would be happy.= Should you call on her...2. 还有一种由be引导的虚拟语气（相当于让步状语从句)，在倒装结构中有时会碰到，be动词提前放到从句句首，形成倒装结构。如：I'll come as promised, be it rainy or fine.不论雨天晴天，我都将如约...
虚拟语气有哪些形式?用法是什么
一、表示与现在事实相反的情况：从句：If 主语+过去时(Be动词用were）主句：主语+should\/would\/could\/might+do 二、表示与过去事实相反的情况：从句：If 主语+had+done 主句：主语+should\/would\/could\/might+have done三、表示对将来情况的主观推测：主句：主语+should+do 从句：①if+主语+were to d...
虚拟语气有哪三种?
对将来进行假设主要有三种情况：1,if条件从句是谓语用动词过去式,则后面的主句是情态动词加动词原形 例：If I came tomorrow ,we would have the meeting.2,if条件从句是were to形式,则后面的主句也是情态动词加动词原形 例：If it were to rain tomorrow ,the meting would be put off.3,if条件...
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虚拟语气(Subjunctive Mood)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。 Ⅰ用以表示虚拟条件的虚拟语气 ⒈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 ...
虚拟语气在什么时候用什么时态?
1、虚拟语气用于条件状语从句中 （1）表示与现在事实相反的假设，条件状语从句中的谓语动词用“过去式（be动词的过去式用were）”，而主句中的谓语动词用“would \/ should\/ could \/ might + 动词原形”。如：If I were a boy, I would join the army.If the had time, she should go with ...
虚拟语气的三种时态有哪些呢?
动词wish后接宾语从句时，从句谓语要用虚拟语气。若要表示与现在事实相反的愿望，从句谓语用一般过去时或过去进行时(同样be动词换成were)；若表示与过去事实相反的愿望，从句谓语用过去完成时had done(注意这里的情态动词不能用should)；若表示将来没有把握或不太可能实现的愿望，用would(could)+动词原形...
虚拟语气怎么用?
1、对现在的虚拟，表示与现在事实相反的假设时，条件状语从句的谓语动词用过去式（be的过去式用were.而主句中的谓语动词用would (should,could, might) + 动词原形。见下表：条件状语从句的动词形式 主句的动词形式 If+主语+ 动词过去式 (be的过去式were.在口语等非正式场合中，I，he，she，it等...
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虚拟语气 情态动词
If he should change his mind,--- If he changed his mind,--- If he were to change his mind,--- 以上三种中，1和3可以进行倒装，原则是删掉if，助动词\/be动词\/情态动词提前，放在句首：1. Should he change his mind,---（正是你的疑问）3. Were he to change his mind,--- ...
