2010年新高三英语名师手记：虚拟语气篇

　　在in case 引导的目的状语从句中，谓语动词用“should+动词原形”;在so that, in order that 等引导的目的状语从句中，谓语动词除了用“should+动词原形”外，还可用“might/could/would+动词原形”。

　　In case you should need any help, here’s my number。

　　In order that training should be effective it must be planned systematically。

　　I took a taxi so that I would/could/might be in time for the appointment。

　　③表示一种假设在将来实现的可能性很小或者根本无法实现，从句谓语动词可用三种形式：①动词过去式 ②were to +动词原形 ③should+动词原形，主句谓语动词用：should (would, could, might)+动词原形。

　　⑵ 省略连词if 的虚拟条件句中

　　如果把连接条件从句的连词if省略，必须将从句的谓语部分的助动词had, 情态动词should或系动词were等移至主语之前，构成倒装语序。例如：

　　Had he known my address(=If he had known my address)， he would have visited me earlier。

　　Should I meet Jay Zhou some day(=If I should meet Jay Zhou some day)， I might tell him that I like him.

　　Were I you(=If you were I)， I would get on well with my teachers and classmates。

　　5. 在It is (high) time(that)…定语从句中，谓语用过去时或用should+动词原形。should不可省略。

　　It’s high time that we devoted/should devote our time to preparing for the coming exam。

　　6. 在if only感叹句中

　　if only表示“但愿……”，“要是……就好了”，句中的谓语动词要用虚拟语气。其构成的方法与wish后的宾语从句基本相同。

　　If only Xiao Hua’s mother were still alive!

　　If only I had known the answer when my teacher questioned me。

　　If only I could fly to the moon in Shenzhou Ⅷ spaceship。

　　7. 在简单句中

　　⑴情态动词Would/could/might，表示说话人的礼貌或委婉的语气，常用于日常会话中。

　　Would you be kind enough to show me the way to the post office? 您能否指点我去邮局的路?

　　Could you let me have your passport? 看看你的护照好吗?

　　Might I speak to you for a moment? 我能和你谈一下吗?(使用might比may更客气)