1、专题四虚拟语气 知 识 梳 理 虚拟语气用于从句1虚拟语气在if非真实条件句中的应用虚拟条件从句(if)主句与现在事实相反的假设主语did /were主语should /would /could /mightdo与过去事实相反的假设主语had done主语should /would /could /mighthave done与将来事实相反的假设主语1.did /were2.should do3.were to do主语should /would /could /mightdo2.虚拟语气的注意事项虚拟语气用于条件状语从句if引导的条件句与现在事实相反If I were you, I woul
2、d seize the chance to go abroad.与过去事实相反If you hadnt encouraged me, I would not have been admitted to this university. 与将来事实相反If it rained /should rain /were to rain tomorrow, I would stay at home.混合条件句If you had not watched television so late last night, you would not be so sleepy now.含蓄条件句由介词(短语)wi
3、th, without, but for, in that position等，或由连词or, otherwise, and, but, but that等代替if条件句I couldnt have finished the work on time without your help.But for your timely warning, we would have got into great trouble.省略if的虚拟条件句当虚拟条件句的谓语动词含有were, should, had时，if可省略，而将were, should, had等词置于句首，形成倒装Were he here
4、, everything would be alright.Should it rain tomorrow, we would put off the trip.虚拟语气用于其他状语从句as if /though引导的让步和方式状语从句He looks as if he were an artist.He talked about the accident as if he had seen it.in order that, so that, in case, for fear that引导的目的状语从句中，谓语动词可用(should) doKeep quiet in case you (s
5、hould) interrupt him.She is now studying hard for fear that she (should) fail in the exam.虚拟语气用于主语从句necessary, natural, strange, important, surprising, vital等用于句型“It isadj.that.”中，that引导的主语从句中谓语动词常用“(should) do”形式 It is necessary that he (should) sort out the information for my reference.It is stran
6、ge that he (should) fall in love with such a snobbish girl.demanded, required, desired, suggested, ordered, decided, requested, recommended等用于句型“It is过去分词that.”中，that引导的主语从句中谓语动词常用“(should) do”形式It is demanded that atomic weapons (should) be prohibited.It is ordered that you (should) be present at t
7、he meeting.虚拟语气用于宾语从句suggest (建议), arrange, command, demand, desire, insist (坚决要求), order, propose, request, require等后面的宾语从句中，谓语动词用 “(should) do”形式I suggest that he (should) put an advertisement in the local paper.They insist that I (should) stay there for supper.wish后的宾语从句I wish that he visited us
8、today.I wish that he had visited us /could have visited us yesterday.I wish that he would /could /might visit us tomorrow.虚拟语气用于表语从句中suggestion, proposal, demand, request, order, advice, desire等名词后面的表语从句中谓语动词用“(should) do”形式His suggestion is that we (should) put the meeting off. All my request is that you (should) be there early.虚拟语气的特殊用法if only句式If only I were a superman.If only you had listened to our advice！在“Its (high) time (that).”句型中，从句的谓语动词一般用过去时或“should do”形式， should不可以省略It is high time that you got up /should get up.
