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1、新概念英语第二册语法精粹四、虚 拟 语 气虚拟语气分三种情况来掌握：1、虚拟条件句。2、名词性虚拟语气。3、虚拟语气的其他用语。一、虚拟条件句：条件状语从句是非真实情况，在这种情况下要用虚拟语气。1、条件从句与现在事实不一致，其句型为：If 主语过去时，主语should（could, would, 或might）动词原形，如：If I were you, I would study hard.If it rained, I would not be here now.2、条件从句与过去事实不一致用语气词写句子，句型为：If 主语had过去分词，主语should（could, would, 或might）ha

2、ve过去分词，如：If the doctor had come last night, the boy would have saved.If I had not studied hard, I would have failed in the exam last term.3、条件从句与将来事实不一致，句型为：do，主语should（could） 原形 do 过去时（与现在事实条件句一样）。If it should rain tomorrow, we would stay at home.If I were to go to the moon one day, I could see it

3、with my own eyes.If you missed the film to night, you would feel sorry.注意问题：1、If条件句中绝对不可出现“would”。2、根据句中的时间状语，有时可能出现“混合虚拟”的情况，即主句可能是现在的情况，条件句也许是发生在过去的情况，但都是遵守上述句型。3、在条件句中如果出现were, had, should可省去if，将主语与这些词倒装，例如：Had the doctor come last night, the boy would have saved.Were I to go to the moon one day,

4、 I would see it with my own eyes.Should it rain tomorrow, we would stay at home.二、名词性虚拟语气：在表示命令、建议要求、惊叹时的名词性从句中需用虚拟语气，基本句型：主语（should）动词原形，如：Mother insisted that John go to bed at 9 oclock.（宾语从句）We suggested that the meeting should not be held.It was required that the crops should be harvested at onc

5、e.（主语从句）The suggestion that he be invited was rejected.（同位语从句）That is their demand that their wages be increased.（表语从句）注意：在这种句子中绝不出现“would”“must”“could”等。三、虚拟语气在一些特殊词中的使用或含蓄条件句：1、wish后的宾语从句：与现在愿望不一致 主语过去时；I wish I were you.与过去愿望不一致 主语had过去分词；I wish I had visited the white House when I was in the sta

6、tes.与未来愿望不一致 主语would（could）原形。I wish I could meet you tomorrow at the party.2、Its time句型：当Its time后用that从句时应该为：主语should原形 或 主语过去时，例如：Its time that you went to school. 或Its time that you should go to school.3、If only引起的感叹句相当于“How I wish宾语从句”If only he could come! 他要能来就好了。If only I had known the answe

7、r! 我要早知答案就好了。4、would rather, as if（though）引导的句子也需使用虚拟，表示过去的情况用过去完成时，表示现在与将来的情况用过去时，如：Id rather you posted the letter right away.Id rather you had returned the book yesterday.She loves the children as if they were hers.Alan talked about Rome as if he had been there.5、without, but, but for, otherwise引

8、起的短语或句子常暗含着含蓄条件。Without you, I would never know him. But for your cooperation, we wouldnt have done the work so well. = If it were not for your cooperation, we we wouldnt have done the work so well.注： without / but for = If it werent not for/ If it hadnt been for ., sb .But that she was afraid, she

9、would have said no.I would be most glad to help you, but I am busy now.I am busy now; otherwise I would do you the favor!【专项训练】1、It is important that a college student a foreign language.Awill masterBmasterCmastersDwould master2、It is strange that she without saying a word.Ashould have gone outBwent

10、Cshould go outDgoes out3、If my lawyer here last Saturday, he me from going.Ahad been, would have prevented Bhad been, would preventCwere, would prevent Dwere, would have prevent4、“He is a brave man.”“Yes, I wish I his courage.”AhaveBhadCwill haveDmay have5、If it rain, the crops would be saved.Ashoul

11、dBwillCis going toDwas to6、He ordered that the medicine by a special plane.Awas sent Bwould be sentCshould sendDbe sent7、If you the medicine, you better now.Atook, would feelBhad taken, feltChad taken, would feelDtook, would have felt8、She is my sister, but she often acts as if my mother.AisBwasCwereDhad been9、I went to bed early last night, but I wish I so.Adidnt doBhadnt doChavent doneDcouldnt do10、Id rather he tomorrow afternoon.Awill comeBcomesCcomingDcame答案：1、B2、A3、A4、B5、A6、D7、C8、C9、B10、D

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