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 虚拟语气是高中必备的语法项目，按多年教学经验，我喜欢用下列三大类方式归纳讲解，便于学生记忆。

一、分时段类（时态类）: 共五种  if /as if /if only=wish /would rather

                总公式  与现在事实相反： 从句 did/were...---主句 would do...   (或could/might/should do)

                      与过去事实相反： 从句 had done...---主句 would have done...

特殊情况： 1.if从句将来段除了did/were，还可用 were to do或should do...

       2.可省略if，产生部分倒装；

       3.if主从句可混合虚拟；

       4.if可用介副词含蓄虚拟（but for，without，with，otherwise，but等）。

       5.if only=wish将来段用 would do或could do...

二、should类（It's...类）：共四种

   1.请求建议命令类：request,advise/suggest（建议提议）/recommend/propose,order/command,require/demand, insist(坚

     持主张)及其名词在名从中的虚拟，should可省略。

   2.It is highabout time（that）...should do...(should常不省)

                      或...did /were...

   3.It's+ 表语+ that...should do...

   4.in case/for fear that/lest...should do...

三、情态动词四个“本。。。。。。”

  1.should/ought to have done...

  2.could have done...

  3.might have done...

  4.needn't have done...

四、其他

1. May you succeed! Long live the Communist Party of China!
   

2. was/were to have done...

3. would like to have done...

4. would rather have done...,etc.

   三大种类虚拟公式有规律可寻，便于学生快速记忆运用。