If引导的条件状语从句

If引导的条件状语从句,潘店镇中学,语法：,例句：Ifpeopleobeythetrafficrules,therewillbefeweraccidents.,if引导的条件状语从句,if:从属连词，意思是：“如果，假如，倘若”,从句,主句,Therewillbefeweraccidentsifpeopleobeythetrafficrules.,原句可改为：,if引导的条件状语从句既可以放在句子前，也可以放在句子后。从句位于主句之前时，常用逗号将其与主句隔开。,结构：,主句谓语中也可以含有情态动词，如：must,can,could,should等,时态：,if引导的条件状语从句，主句用一般将来时（will）,从句用一般现在时。,例句：Ifpeopleobeythetrafficrules,therewillbefeweraccidents.,主句谓语中也可以用hadbetter(not)do,提建议,例句：如果交通指示灯是红的，你必须停下来等一等。,eg:Ifthetrafficlightsarered,youmuststopandwait.,例句：如果你想减肥，你最好锻炼。,eg:Ifyouwanttoloseweight,youhadbettertakesomeexercise.,“主将从现”,if的反义词：if.not.=unless,意思是：“如果不，除非”,IwontgothereunlessIhearfromyou.(同义句)Iwontgothere_I_hearfromyou.,ifdont,IwontgotothepartyifIamnotinvited.(同义句)Iwontgototheparty_Iaminvited.,unless,变换：,1.有if引导的条件状语从句的复合句中，当主句和从句的主语均为you时，可转换为“祈使句，and+简单句”或“祈使句，or+简单句”,Youcanpasstheexamifyouworkhard.-，andyouwillpasstheexam.,Ifyoudonthurryup,youwillbelateagain.Hurryup,-youwillbelateagain.,Workhard,or,2.借助介词with或without来转换。例如:Ifyouhelpme,Illfinishmyjobsoon.-,Illfinishmyjobsoon.如果你帮我，我将很快完成我的工作。Ifthereisnowater,fishmaydie.Fishmaydie-.如果没有水，鱼可能会死。,Withyourhelp,withoutwater,注意事项1.在if引导的条件状语从句中，当主句是一般将来时时，不能够使用begoingto结构，而要用will。例如：IllhelpyouwithyourEnglishifIamfreetomorrow.如果明天我有空，我会帮你学英语。2.在if引导的条件状语从句中不能够使用some，而要用any。例如：Ifyouhaveanyquestionstoask,pleasecometomyoffice.如果你有问题要问的话，请到我办公室来。,if引导的条件状语从句和if引导的宾语从句的区分:,If在宾语从句中翻译为“是否”If在条件状语从句中翻译为“如果”,IllgotoseeyouifIamfreenextweek.,Iwanttoknowifheisateacher.,whether,1.if在句中的含义不同,2.if在从句中的位置不同,If引导的宾语从句放在主句之后；而if引导的状语从句可放在主句之前也可放在主句之后,=Ifitdoesntrain,Iwillgoouttomorrow.,Iwillgoouttomorrowifitdoesntrain.,Idontknowifthetrainhasarrived.,If引导的条件状语从句放于句首时多用逗号隔开；而if引导的宾语从句则不能。,找出下列句子中哪些是if条件状语从句，哪些是if宾语从句,1.Canyoutellmeifshecancometothemeeting?2.Shewillnotgothereifitisrainytomorrow.3.Icantguessifshewillbeangry.4.Ifwehelpeachother,webothwillgetgoodresults.,3.时态要求上有区别,If引导条件状语从句的时态为一般现在时记住“主将从现”,1.Iwanttoknowifthereasportsmeetingnextmonth.,doesntrain,willbe,2.Ifit,wellholdit.,If引导的宾语从句的时态由主句及本身时态决定；,If引导的条件状语从句的练习,1IfI_(notunderstand）,Iwillaskmyteacherforhelp.IfI_(copy)yourhomework,Iwillcheatmyself.3Ifshe_(notget)upearly,shellmisstheearlybus.4Ifyourmother_(buy)thebookforyou,itwillbegoodforyourstudy.,dontunderstand,copy,doesntget,buys,5.Ifyou_(notwork)hard,you_(notpass)theexam.6.Ifshe_(mend)thecomputer,herfather_(notblame).7.Ifyourbrother_(break)thewindow,hewillfeelverysorryforthat.8.Ifthecomputer(notwork),menditplease.,dontwork,wontpass,mends,wontblame,breaks,doesntwork,9.Ifshe_(notbe)interestedinmath,shewillfinditveryboring.10.Ifyou_(get)highscores,yourparentswillbeproudofyou.11.Ifyou_(be)happy,wewillbehappy.12.Ifshe(translate)thesentencewordbyword,she_(get)itstruemeaning.,isnt,get,are,translates,willget,1.Ifyou_totheparty,youllhaveagreattime.A.willgoB.wentC.goD.going2I_hertheanswerifshe_me.A.cantell,willaskB.willtell,willaskC.wouldtell,askD.willtell,asks,C,D,3.Whatareyougoingtodotomorrow?