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.if的反义词：if...not...=unless,意思是：“如果不，除非”Iwon’tgothereunlessIhearfromyou.(同义句)Iwon’tgothere_____I_____hearfromyou.ifdon’tIwon’tgotothepartyifIamnotinvited.(同义句)Iwon’tgototheparty_____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.Ifyoudon'thurryup,youwillbelateagain.Hurryup,------youwillbelateagain.Workhardor2.借助介词with或without来转换。例如:Ifyouhelpme,I’llfinishmyjobsoon.------------------,I’llfinishmyjobsoon.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。Withyourhelpwithoutwater•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：I’llhelpyouwithyourEnglishifIamfreetomorrow.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”I’llgotoseeyouifIamfreenextweek.Iwanttoknowifheisateacher.whether1.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=Ifitdoesn’train,Iwillgoouttomorrow.Iwillgoouttomorrowifitdoesn’train.Idon’tknowifthetrainhasarrived.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。1.Canyoutellmeifshecancometothemeeting?2.Shewillnotgothereifitisrainytomorrow.3.Ican’tguessifshewillbeangry.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.doesn’trainwillbe2.Ifit,we’llholdit.If引导的宾语从句的时态由主句及本身时态决定；1IfI_______________(notunderstand）,Iwillaskmyteacherforhelp.2IfI__________(copy)yourhomework,Iwillcheatmyself.3Ifshe_______________(notget)upearly,she’llmisstheearlybus.4Ifyourmother_______(buy)thebookforyou,itwillbegoodforyourstudy.don’tunderstandcopydoesn’tgetbuys5.Ifyou____________(notwork)hard,you_________(notpass)theexam.6.Ifshe________(mend)thecomputer,herfather___________(notblame).7.Ifyourbrother____________(break)thewindow,hewillfeelverysorryforthat.8.Ifthecomputer(notwork),menditplease.don’tworkwon’tpassmendswon’tblamebreaksdoesn’twork9.Ifshe_______(notbe)interestedinmath,shewillfinditveryboring.10.Ifyou_________(get)highscores,yourparentswillbeproudofyou.11.Ifyou_________(be)happy,wewillbehappy.12.Ifshe(translate)thesentencewordbyword,she________(get)itstruemeaning.isn’tgetaretranslateswillget1.Ifyou_____totheparty,you’llhaveagreattime.A.willgoB.wentC.goD.going2．I____hertheanswerifshe____me.A.cantell,willaskB.willtell,willaskC.wouldtell,askD.willtell,asksCD3.–Whatareyougoingtodotomorrow?--We’llgotothelibrarytomorrowifit___.A.isn’trainB.rainC.won’trainD.doesn’train4.Whatwillyoudoifyou_____totheoldfolk’shomevisit?A.goB.wentC.goingD.willgoAD