if条件状语从句的语法-初中.ppt

,If从句（条件状语从句）,Completethesentenceswiththecorrectformofthewords.,1.Ifyou_(listen)tothemusic,_(buy)aCD.2.Ifhe_(be)lateforschool,_(notwait)forhim.3.Ifyou_(buy)anewcamera,_(get)agoodone.4.Ifthelight_(notcome)on,_(wait)foroneminute.,is,buy,get,doesntcome,wait,dontwait,listen,buy,Revision,Revision,祈使句+if条件状语从句if条件状语从句，+祈使句（从句后加逗号）,if条件状语从句要用一般现在时。,句型结构,时态,If条件状语从句（1）,LetssingthesonginChinese:,Ifyouarehappy,Whatwillyoudoifyourehappy?,IfImhappy,Iwill_.IfImhappy,Iwill_.IfImhappy,Iwill_.IfImhappy,Iwill_.,clapmyhands,stampmyfeet,winkmyeyes,nodmyhead,IfImhungry,Iwill_.,IfImtired,Iwill_.,Lookandsay,eatsomefood,havearest,IfImill,_.,Iwillseeadoctor,Lookandsay,IfImlate,_.,Iwillsaysorry,Ifitrainstomorrow,I_.,willwatchTVathome,Ifit_tomorrow,_.,Illplaybasketball,doesntrain,Iwont_.,playbasketball,Ifyouarefreethisweekend,whatwillyoudo?,IfIamfree,sleepwatchTVplaycomputergames,practice,grammar,if条件状语从句(2),句子特点：1.if从句中用一般现在时，表示未来的一种条件，从句中可以加时间状语。2.当if表示未来的条件时，主句中用一般将来时。句型结构：主句+if条件状语从句if条件状语从句，+主句（从句后加逗号）,3.时态：if一般现在时，+主句一般将来时或（can/may/must+v.),e.g.1.Ifyoudontgetupearly,youwillbelateforschool.你如果不早点起床，上学就会迟到。2.IfIplaygamesonit,itwillgowrong.如果我用它玩游戏，它就会坏掉。,3.Ifyoufinishthehomework，youcangohome如果你作业做完了就可以回家了。,4.Ifyouwanttoloseweightyoumust/shouldeatlessbread.如果你想减肥，你必须少吃面包。,5.Ifyouheaticeitturnstowater.(也可用willturn)如果把冰加热，它就会化成水。,if条件句不一般,几个要点记心间。条件句放在前,逗号要放句中间。条件句表可能,主句多用将来时；条件句表事实,主句常用现在时。if条件句有特点,现在时把将来替；这个规则要牢记!,if条件句歌诀,1.Ifhe_(not,doit),I_(do)it.,2.Ifyou_(be)lateforschool,myteacher_(be)angry.,are,willbe,3Ifshe_(win)theprize,we_(be)happy.,wins,willbe,4.IfI_(not,eat)somuch,I_(get)thinner.,5.Ifyou_(tell)them,they_(not,believe)you.,donteat,willget,tell,wontbelieve,6I_(stay)athome,Ifit_(rain).,7.Ifit_(not,rain),I_(go)out.,8.we_(play)football,Ifitis_(sun).,9.Ifshe_(become)astar,herparents_(not,send)heraway,10.He_(watch)TV,ifhe_(be)free.,willstay,rains,doesntrain,willgo,willplay,sunny,becomes,wontsend,willwatch,is,doesntdo,willdo,ExerciseTime,-Imalwaystiredinthemorning.,-Ifyougotobedearly,youwontbetiredinthemorning.,Givingsuggestions:,-IgetthirstywhenIrun.,-Ifyoutakesomewaterwithyou,youwontgetthirstywhenyourun.,Iworrysomuchaboutmyschoolwork.,-Ifyoualwaysworkhard,youwontworryaboutyourschoolwork.,Youshouldworkhard!,Unit3activity1Rewritethesentenceswithif:,Listeninclass,oryouwontunderstandwhattodo.,Ifyoudontlisteninclass,youwontunderstandwhattodo.,1)Eatsomebreakfast,oryoullgethungryatschool.2)Hurryup!Wellbelate!3)Readtheinstructionscarefully.Thenyoullknowwhattodo.,Ifyoudonteatsomebreakfast,youllgethungryatschool.,Ifyoudonthurryup,wellbelate.,Ifyoureadtheinstructionscarefully,youllknowwhattodo.,Activity2.Completethesentences,Iwanttogethighscores.If_(workhard/dowell),youworkhard,youwilldowell.,1.-howcanIremembermyfriendsbirthdays?-If_(keepanoteinyourdiary/notforget).2.-Itslate,butIdontwanttogotosleep.-If_(notgetenoughsleep/feeltiredatschool).,youkeepanoteinyourdiary,youwontforget.,youdontgetenoughsleep,youllfeeltiredatschool.,3.-IdontlikespeakingEnglishoutsidetheclassroom.-If_(notpractice/notimprove).4.-ShouldItellmyteacherIdontunderstandthehomework?-If_(nottellher/shenotabletohelpyou).5.-IsitOKifIwatchTVforsixhours?-If_(youwatchtoomuch/eyeshurt).,youdontpractice,youwontimprove.,youdonttellher,shewontbeabletohelpyou.,youwatchtoomuchTV,youreyeswillhurt.,summary,if的用法,2.引导条件状语从句：译为“如果，假如”(1)if从句+祈使句(2)if从句+主句（一般将来时）,1.引导宾语从句：译为“是否”，表示不确定的概念。,Idontknowifyourfathercancometogether.Canyoutellmeifmissyourparents?,e.g.IfIwereyou,Iwouldinvitehimtotheparty.如果我是你，我会邀请他参加聚会。Ifhehadhurried,hecouldhavecaughtthetrain.如果他抓紧点，他会赶上火车的。IfIweretogoabroad,IwouldgotoAmerica.如果我出国了，我会去美国。,3.非真实条件句（虚拟语气）：表示不可实现的条件或根本不存在的条件。从句多用一般过去时或过去完成时，表示对现在或过去的一种假设。,()6.Mikewantstoknowif_apicnictomorrow.Yes.Butifit_,wellvisitthemuseuminstead.A.youhave/willrainB.youwillhave/willrainC.youwillhave/rainsD.willyouhave/rains()7.Ireallydontknowifshe_itwhenshe_.A.finds/arrivesB.finds/willarriveC.willfind/willarriveD.willfind/arrives,（）4.Idontknowif_tomorrow.A.itdoesntrainB.therainwillstopsC.therainswontstopD.itwontrain（）5.Thevolleyballmatchwillbeputoff(推迟）ifit_.A.willrainB.rainsC.rainedD.israining,（）1.Becareful,ifyou_wanttomakemistakes.A.wontB.dontC.didntD.not（）2.Workhardifyou_togetagoodmark.A.wantedB.wantingC.wantD.willwant（）3.-Iwanttoknowifyou_tothepartytomorrow.-IwillifI_fre