初中语法之if条件状语从句说课材料.ppt
初中语法之if条件状语从句主句主句+if条件状语从句条件状语从句 if条件状语从句，条件状语从句，+主句（从句后加逗号）主句（从句后加逗号）if条件状语从句要用一般现时。条件状语从句要用一般现时。句型结构句型结构时态时态If条件状语从句条件状语从句Ifyouarefreethisweekend,whatwillyoudo?IfIamfree,sleepwatchTVplaycomputergamespracticeif条件状语从句条件状语从句(2)句子特点：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。从句中可以加时间状语。2.当当if表示未来的条件时，主句中用一般将来时。表示未来的条件时，主句中用一般将来时。句型结构：句型结构：主句主句+if条件状语从句条件状语从句 if条件状语从句，条件状语从句，+主句（从句后加逗号）主句（从句后加逗号）3.时态时态：if一般现在时，一般现在时，+主句一般将来时或主句一般将来时或（can/may/must+v.)e.g.1.Ifyoudontgetupearly,youwillbelateforschool.你如你如果不早点起床，上学就会迟到。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。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。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。如果你想减肥，你必须少吃面包。5.Ifyouheaticeitturnstowater.(也可用也可用willturn)如果把冰加热，它就会化成水。如果把冰加热，它就会化成水。vif条件句不一般条件句不一般,几个要点记心间。几个要点记心间。v条件句放在前条件句放在前,逗号要放句中间。逗号要放句中间。v条件句表可能条件句表可能,主句多用将来时；主句多用将来时；v条件句表事实条件句表事实,主句常用现在时。主句常用现在时。vif条件句有特点条件句有特点,现在时把将来替；现在时把将来替；v这个规则要牢记这个规则要牢记!if条件句歌诀条件句歌诀1.Ifhe_(not,doit),I_(do)it.2.Ifyou_(be)lateforschool,myteacher_(be)angry.arewillbe3Ifshe_(win)theprize,we_(be)happy.winswillbe4.IfI_(not,eat)somuch,I_(get)thinner.5.Ifyou_(tell)them,they_(not,believe)you.donteatwillgettellwontbelieve6I_(stay)athome,Ifit_(rain).7.Ifit_(not,rain),I_(go)out.8.we_(play)football,Ifitis_(sun).9.Ifshe_(become)astar,herparents_(not,send)heraway10.He_(watch)TV,ifhe_(be)free.willstayrainsdoesntrainwillgowillplaysunnybecomeswontsendwillwatchisdoesntdowilldo-Imalwaystiredinthemorning.-Ifyougotobedearly,youwontbetiredinthemorning.Givingsuggestions:-IgetthirstywhenIrun.-Ifyoutakesomewaterwithyou,youwontgetthirstywhenyourun.I worry so much about my schoolwork.-Ifyoualwaysworkhard,youwontworryaboutyourschoolwork.Youshouldworkhard!Unit 3 activity 1 Rewrite the sentences with if:Listeninclass,oryouwontunderstandwhattodo.Ifyoudontlisteninclass,youwontunderstandwhattodo.1)Eat some breakfast,or youll get hungry at school.2)Hurry up!Well be late!3)Read the instructions carefully.Then youll know what to do.Ifyoudonteatsomebreakfast,youllgethungryatschool.Ifyoudonthurryup,wellbelate.Ifyoureadtheinstructionscarefully,youllknowwhattodo.Activity2.Completethesentences I want to get high scores.If _(work hard/do well)youworkhard,youwilldowell.1.-howcanIremembermyfriendsbirthdays?-If_(keepanoteinyourdiary/notforget).2.-Itslate,butIdontwanttogotosleep.-If_(notgetenoughsleep/feeltiredatschool).you keep a note in your diary,you wont forget.you dont get enough sleep,youll feel tired at school.3.-IdontlikespeakingEnglishoutsidetheclassroom.-If_(notpractice/notimprove).4.-ShouldItellmyteacherIdontunderstandthehomework?-If_(nottellher/shenotabletohelpyou).5.-IsitOKifIwatchTVforsixhours?-If_(youwatchtoomuch/eyeshurt).you dont practice,you wont improve.you dont tell her,she wont be able to help you.you watch too much TV,your eyes will hurt.if的用法的用法2.引导条件状语从句：引导条件状语从句：译为译为“如果，假如如果，假如”(1)if从句从句+祈使句祈使句(2)if从句从句+主句（一般将来时）主句（一般将来时）1.引导宾语从句引导宾语从句：译为：译为“是否是否”，表示不确定的概，表示不确定的概念。念。Idontknowifyourfathercancometogether.Canyoutellmeifmissyourparents?e.g.IfIwereyou,Iwouldinvitehimtotheparty.如果如果我是你，我会邀请他参加聚会。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。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。如果我出国了，我会去美国。3.非真实条件句（虚拟语气）非真实条件句（虚拟语气）：表示不可实现的条件：表示不可实现的条件或根本不存在的条件。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。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_free.A.willcome;amB.come;amC.willcome;willbeD.come;willbeexercisesBCADBCD If you have some problems in your life,what will you do?ProblemsMr Greens problem?IfIhaveenoughmoney,Iwilltravelaroundtheworld结束语结束语谢谢大家聆听！谢谢大家聆听！22
