易错知识点归纳一高三英语虚拟语气知识点英语虚拟语气类 别用 法例 句If 引导的条件从句与现在事实相反从句动词：过去式（be 用 were）主句动词：should/would/could/might+doIf he were here, he would help us.与过去事实相反从句动词：had+done主句动词：should/would/could/might+have+doneIf I had been free,I would have visited you.与将来事实相反从句动词：过去式/should+动词原形/were+to do 主句动词：should/would/could/might+动词原形If it should rain tomorrow, we would not go camping.省略 if 的虚拟条件句将虚拟条件从句中的 were，had,should 放到主语之前，构成主谓倒装①Should he come ,tell him to ring me up.②Were I you,I would not do it.③Had I been free,I would have visited you.混合虚拟条件句不同时间的虚拟：各遵守各的规则①If he had listened to me, he would not be in trouble now.②If he had told me yesterday,I should know what to do now.③If I were you, I would have gone to her birthday party.虚拟与陈述的混合：各遵守各的规则①He could have passed the exam,but he wasnrsquo;t careful enough.②You should have come earlier.The bus left a moment ago.含蓄虚拟条件句but for+名词表示虚拟条件句子或主句中的谓语动词的形式视具体情况而定。这是考查考生应变能力的最佳试题。---But for your timely warning,we ______ into great trouble.---You know wersquo;re friends.A. would get B. must have gotC. would have got D. canrsquo;t have gotwithout+名词表示虚拟条件Without the air to hold some of the sun's heat, the earth at night would be freezing cold.动词不定式表示虚拟条件It would be only partly right to follow in this way.假如用这种方式，仅仅对了一半。现在分词表示虚拟条件Having known in time ,we might have prevented the accident.要是及时得知的话，我们也许能阻止这场事故。过去分词表示虚拟条件Given more attention, the tree could have grown better.假如多留心的话，这树原来可以长的更好。副词 otherwise 表示虚拟条件I was too busy at ...
