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例如：Wewillgototheparkifit_____________(rain)tomorrow.含if条件状语从句的主从复合句1.if条件状语从句中，主句用一般将来时，从句用___________表示将来。________原则。doesn’t主将从现rain一般现在时2.if条件状语从句中，如果主句有must，can，may等情态动词，从句用___________。例如：Youmuststopifthetrafficlight____(be)red.is一般现在时例如：Don’twaitformeifI_____(be)late.3.if条件状语从句中，主句是祈使句，从句用____________表示将来。_________原则。am主祈从现一般现在时if引导的句子在复合句中表示条件，做主句的条件状语。含义：结构：1）Ifitdoesn’raintomorrow，I’llgotothepark.2）Mysisterwillgoshoppingwithyouifshehastimetomorrow.从句可以放在主句前或主句后。从前主后逗号隔开,主前从后if连接.if引导的条件状语从句与主句的时态：主三从现3）主祈从现：如果主句是祈使句，从句用一般现在时表将来。例：Pleaseputupyourhandsifyouhaveanyquestions.1）主将从现：如果主句是一般将来时，从句则用一般现在时表将来。例：Ifitrainstomorrow，Iwillstayathome.2)主情从现：主句含有must,may,can等情态动词,从句用一般现在时表将来。例:Youmuststopifthetrafficlightisred.1.有许多担忧________________________2.与其他人交谈_____________________3.害怕做某事_____________________4.最终____________5.生气___________havealotofworriestalktootherpeoplebeafraidtodosth.intheendbeangry6.犯一些粗心的错误_____________________________7.分享我的问题_____________________8.逃避问题__________________________9.将……分成两半_______________10.完成了某件事的一半、一部分____________________makesomecarelessmistakessharemyproblemsrunawayfromtheproblemscut…inhalfbehaltwaytodoing11.解决问题___________solveaproblem1.Somepeoplebelievetheworstthingistodonothing.2.Ithinktlkingtosomeonehelpsalot.3.Herdadsaidhesometimesmadecarelessmistakeshimself.4.Hethinksthefirststepistofindsomeoneyoutrusttotalkto.5.Studentsoftenforgetthattheirparentshavemoreexperience,andarealwaystheretohelpothers.2cReadthepassageagainandanswerthequestions.Discussyouranswerswithapartner.1.Whatistheworstthingtodoifyouhaveaproblem?____________________________________________________________________________2.Whydidn’tLaurawanttotellherparentsaboutherlostwallet?______________________________________Theworstthingtodoifyouhaveaproblemistodonothing.Shewasafraidtheywouldbeangry.3.Whatisthefirstthingyoushoulddowhenyouwanttosolveaproblem?________________________________________________________________________________4.Whycanourparentsgiveusgoodadviceaboutourproblems?____________________________________________________________________________Thefirststepistofindsomeonewetrusttotalkto.theyhavemoreexperiencethanus,andarealwaystherehelpus.1.unlessconj.除非；如果不她会一直唱下去，除非你要求她停止。Shewillkeepsingingunlessyouaskhertostop.unless引导条件状语从句，主将从现如：除非下雨，否则我们就会去爬山。在英语中，我们可以用unless表达这个意思，相当于if…not。以这个句子为例：Wewillgotothemountainunlessitisrainy.=Wewillgotothemountainisifitisnotrainy.Youwillachievenothing______youworkhard.A.ifB.unlessC.whenD.that答案：BYoumayeasilyloseyourwayinShanghai_____youdon’thaveamaporaguide.A.untilB.unlessC.thoughD.if答案：DIwon'ttakepartinMike'sbirthdayparty________Iaminvited.A.unlessB.afterC.becauseD.if答案：A2.beafraidtodosth.害怕干某事我害怕在其他人面前发言。I’mafraidtospeakinfrontofotherpeople.beafraidofsth.害怕某事他告诉我不要怕困难。Hetoldmenottobeafraidofdifficulties.beafraid+that从句I’mafraidthatIcan’tfinishontime.我恐怕我不能按时完成它。Fillintheblankswiththephrasesinthebox.2ddiscussyourproblemstellherparentsunlessyoutalkrunawayfromtalktosomeoneshareherproblemstodonothingStudentsoftenhavealotofproblemsandworries.LauraMillsthinkstheworstthingis_____________.Shethinksyou’llfeelworseifyoudon’t______________aboutyourproblems.Lauraremembersthatsheoncelostherwalletandwasafraidto_____________aboutit.Nowshebelievesyoucannotfeelbetter_______________tosomeone.todonothingtalktoanyonetellherparentsunlessyoutalkShesaysshewillalways__________________inthefuture.RobertHuntagreeswithLaura.Hethinksyoushouldnot_______________yourproblems,butyoushouldtrytosolvethem.IfyoucannottalktoanexpertlikeRobert,youcan____________________withyourparentsbecausetheyhavealotofexperience.shareherproblemsrunawayfromdiscussyourproblemsTalktosomeoneyouknow.Findouthis/herthreebiggestworries.Trytothinkofsomesolutionstotheproblemsandwritethemdown.3adon’tstayuplate,buyanalarmclock,rideyourbiketogotoschooltooheavyeatlessjunkfoodandmorevegetables,domoreexercisealwaysbelateforschoolProblemsPossiblesolutionstakenotesinclass,domoreexercises,asktheteacherforhelpphysicsisdifficultMyfriend_______hasaproblem.He/She_____________________________.Ithinkhe/sheshould___________________.Ifhe/she_________________________,he/shewill__________________________.Writeaboutyourfriend’sfirstproblemandthepossiblesolutions.Usethestructuresbelowtohelpyouplanyourwriting.3b1.分析3b中的作文提纲，可以看出。我们需写三个方面的内容就能轻松完成一篇小作文。首先，写清楚朋友的名字及其现在存在的问题或困难。然后，写出自己给他的建议。并用if从句来进一步说明自己建议将会起到的作用。最后，复读一遍作文来检查有没有错误。MyfriendJennyhasaproblem.Sheistooheavy.Ithinksheshouldeatlessjunkfoodandeatmorevegetablesandfruit.Ithinkshealsoshouldgetmoreexercise.Ifsheeatsmorevegetablesandfruit,shewilleatlessjunkfood.Ifshegetsmoreexercise,she’llbemuchthinnersoon.Possibleversion….Sheisalwayslateforschool.Ithinksheshouldn’tstayuplateronweekdays.Sheshouldgetanalarmclock.Sheshouldridesherbiketoschool.Ifshehasanalarmclock,shewillgetupearly.Possibleversion: