英语北师大版选修7 Unit21 Lesson 1 Chewing Gum 3VIP免费

Unit21Lesson1Grammar:ConditionalsRevision1．条件句有两类，一类是真实条件句，一类是虚拟条件句。2．如果假设的情况是有可能发生的，就是真实条件句（Zeroconditional）。真实条件句中的谓语用陈述语气。Eg。Ifitdoesn’traintomorrow,wewillgotothepar.如果明天不下雨,我们就去公园.3.如果假设的情况是过去或现在都不存在的,或将来不大可能发生的,则是虚假条件句,共有三种情况.Eg.Ifhehadseenyouyesterday,hewouldhaveaskedyouaboutit.如果他昨天见到你,他会问你这件事的.(事实上他昨天没有见到你,因此也未能问你这件事.)4.在含有虚拟条件句的复合句中,主句和从句的谓语都要用虚拟语气.虚拟条件从句和主句的动词形式列表如下:时间从句主句与现在事实相反动词过去式(be动词的过去式一般用were)would(should/could/might)+动词原形与过去事实相反Had+过去分词would(should/could/might)+had过去分词与将来事实相反动词过去式/should+动词原形wereto+动词原形would(should/could/might)+动词原形5.虚拟条件句的用法1)表示与现在事实相反的假设和结果(1stconditional)Eg.IfIwereyou,Ishould/could/would/mighttellhimthetruth.如果我是你,我就会/可能对他说实话.Ifhehadtime,hewould/could/mightgowithyou.如果他有时间,他就会/可能和你一起去.Ifmybrotherwerehere,everythingwouldbeallright.要是我哥哥在这儿,一切都没问题了.2)表示与过去事实相反的假设和结果(2ndconditional)用心爱心专心Eg.Ifyouhadtakenmyadvice,youwouldn’t/couldn’thavefailedintheexam.如果你按照我的建议去做,你不会/不可能考试不及格.IfIhadhadthemoneylastweek,Ishould/would/could/mighthaveboughtacar.如果我上星期有了这笔钱,我就会/可能买辆车.Shewould/could/mighthavetelephonedyouimmediately,ifshehadwonthegame.如果她比赛赢了,她就会/可能给你打电话.Ifyouhadcomeafewminutesearlier,youwould/could/mighthavemetthefamoussinger.如果你早来几分钟的话,你就会/可能会见到那个著名的歌唱家.3)表示与将来事实可能相反的假设和结果(3rdconditional)Eg.IfitwereSundaytomorrow,Ishould/would/could/mightgotoseemygrandmother.如果明天是星期天,我就/可能去看我的奶奶.Ifitweretosnowthisevening,theywouldnotgoout.如果今晚下雪,他们就不出去了.Ifitshouldrain,thecropswould/could/mightbesaved.如果下雨,庄稼就一定/可能有救.6.主,从句的动作发生时间不一致的情况(mixedconditional)有时条件从句中的动作和主句中的动作发生的时间不一致,这时动词的形式要根据它所表示的时间加以调整.Eg.Ifyouhadlistenedtothedoctor,youwouldbeallrightnow.如果你当初听了医生的话,身体现在就好了.(从句动作指过去,主句动作指现在)IfyouhadpracticedspeakingEnglishmore,youwouldbeabletospeakitfluently.如果你多练习讲英语,现在就能讲得很流利了.用心爱心专心