条件状语从句

IfyouarehappyIfyouarehappyandyouknowitclapyourhands

IfyouarehappyandyouknowitclapyourhandsIfyouarehappyandyouknowitneverbeafraidtoshowitIfyouarehappyandyouknowitclapyourhandsIfyouarehappyandyouknowitstompyourfeet.Ifyouarehappyandyouknowitstompyourfeet.IfyouarehappyandyouknowitneverbeafraidtoshowitIfyouarehappyandyouknowitstompyourfeetIfyouarehappyandyouknowitwinkyoureyeIfyouarehappyandyouknowitwinkyoureyeIfyouarehappyandyouknowitneverbeafraidtoshowitIfyouarehappyandyouknowitwinkyoureye第一页，共41页。Ifyouarehappy,whatwillyoudo?

IfIamhappy,Iwillsmile.第二页，共41页。Ifyoubecomesad,whatwillyoudo?IfIbecomesad,Iwillcry.第三页，共41页。Sheisdoingherhomework.Ifyouarehard-working,youwillgetgoodgrades.Shegetsgoodgrades.第四页，共41页。Ifyouplaycomputergamesonweekdays

,you’llbeverytiredinclassyourparentswillbesad.youwon’tgetgoodgrades.youreyeswillbepoor第五页，共41页。Shewillbelate.Ifshe_____toschool,she________late.Sheisgoingtowalktoschool.walkswillbeLead-in第六页，共41页。位置：从句可放在主句之前或之后，但是放在主句之前须有逗号隔开eg:如果我有足够的钱，我就去环游世界If引导条件状语从句定义：if

“如果,假如”它引导的句子表示某事发生所需的条件，即“在…条件下，某事才能发生”，在句子中充当状语，因此称之为条件状语从句。（If引导的条件状语从句表示假如有从句的动作发生，就会有主句动作的发生）IfIhaveenoughmoney,Iwilltravelaroundtheworld=IwilltravelaroundtheworldifIhaveenoughmoney第七页，共41页。If条件句：条件句用于陈述语气，表示假设的情况可能发生，其中if是“如果”的意思。

主句一般将来时

，从句用一般现在时。

第八页，共41页。用法：1.

如果主句是一般将来时，从句则用一般现在时。

Ifitrains（从句），Iwillstayathome.I’llgowithyouifyoudon’twanttogoalone（从句）.2.如果主句含有must,may,can等情态动词，从句也要用一般现在时。

Ifyoudrivetoofast,youmayhaveanaccident.Youmuststopifthetrafficisred.Ifyoufinishthehomework，youcangohome．如果你作业做完了就可以回家了。

Ifyouwanttoloseweightyoumust/shouldeatlessbread.

如果你想减肥，你必须少吃面包。第九页，共41页。3.如果主句是祈使句，从句同样要用一般现在时。Don’tgoandplayfootballifyoudon’tfinishyourhomework.PleasecallmeifhecomesnextSunday.第十页，共41页。1.

如果主句是一般将来时，从句则用一般现在时。

Ifitrains（从句），Iwillstayathome.I’llgowithyouifyoudon’twanttogoalone（从句）.2.如果主句含有must,may,can等情态动词，从句也要用一般现在时。

Ifyoudrivetoofast,youmayhaveanaccident.Youmuststopifthetrafficisred.3.如果主句是祈使句，从句同样要用一般现在时。

Don’tgoandplayfootballifyoudon’tfinishyourhomework.

PleasecallmeifhecomesnextSunday.if条件状语从句结构及时态Revision第十一页，共41页。练一练：1。如果她早点儿起床，就有时间在家里吃早餐Ifshe________alittleearlier,she’llhavetimetoeatbreakfastathome.2。如果你参加聚会，你将会过得很开心。Ifyou____theparty,you_________agreattime.3。如果明天下雨，我们将不去野餐Ifit____tomorrow,we_______forapicnic.4。如果你经常听英文歌，你将会喜欢英语Ifyouoften_______Englishsongs,you______English.getsupjoin

willhaverains

won’tgolistento

willlike第十二页，共41页。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.don’teatwillgettellwon’tbelieve6I_________(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.willstayrainsdoesn’trainwillgowillplaysunnybecomeswon’tsendwillwatchisdoesn’tdowilldo第十三页，共41页。

2.You

may______(pass)

the

exam

if

you

___(study)

hard.

rainswillstaypassstudy

3.Ifyouwanttorecord,________(press)theredlight.press1.IfIt______(rain)tomorrow,I______(stay)athome.Fillintheblanketswiththeproperform

第十四页，共41页。1.I’msureifhe_____(go)totheparty,he________(have)agreattime.2.Iftherain_______(stop)tonight,wewillgotothecinema.3.I’llbuyacomputerifI______(have)enoughmoney.4.You_________(notget)nervousifyou_____(do)enoughexercise.6.Iwanttoknowifhe_________(come)tomorrow,ifhe_______(come),I__________(give)themassagetohim.goeswillhavestopshavewon’tgetdocomeswillcomewillgive第十五页，共41页。IfI’mill,__________________.

IwillseeadoctorLookandsayIfI’mlate,_________________.Iwillsaysorry第十六页，共41页。IfI’mhungry,Iwill______________.IfI’m

tired,Iwill_____________.Lookandsayeatsomefoodhavearest第十七页，共41页。

Ifitrainstomorrow,I_____________________.willwatchTVathomeIfit_____________tomorrow,________________.I’llplaybasketballdoesn’trainIwon’t________________.playbasketball第十八页，共41页。Ifyouarefreethisweekend,whatwillyoudo?IfIamfree,…sleepwatchTVplaycomputergamespractice第十九页，共41页。Ifyouwanttogetgoodmarks,

dowhat?Don’tdowhat?Ifyouwanttogetgoodmarks,__________.Ifyouwanttogetgoodmarks,don’t__________.studyhardlistentoteacherscarefully.dohomeworkbyyourself.

copyyourhomework.talkintheclasscheatintheexams第二十页，共41页。Ifyouhaveenoughpocketmoney,whatwillyoubuy?IfIhaveenoughpocketmoney,I____________________.第二十一页，共41页。IfyouinviteforeignerstoChina,wherewillyougo?Iwillgoto_________,ifIinviteforeignerstoChina.MountTaiWestlakeHainan第二十二页，共41页。GameRulesTopic1:IfIamhappy,……A:IfIamhappy,Iwillgoshopping.B:IfIgoshopping,Icanbuysomeclothes.C:IfIcanbuysomeclothes,Iwillspendmuchmoney.D:IfIspendmuchmoney,……E:…..【比一比】：一分钟内，根据所给话题，看同学们能接出多少条件状语从句。【注意】在句子接龙时，主句与从句变换时，要注意从句时态的变换，从句用一般现在时。第二十三页，共41页。If条件句的替代形式：

（1）祈使句+and/or+陈述句（谓语动词通常用将来时态）。其中，and表示句意顺承；or表示转折，意为“否则”。e.g.Ifyouworkhard,you’llpasstheexameasily.=Workhard,andyou’llpasstheexameasily.Ifyoudon’tworkhard,you’llfallbehindothers.=Workhard,oryou’llfallbehindothers.verygood第二十四页，共41页。（2）用介词with,without的替代形式：

e.g.Ifthereisnowater,thefishmaydie.

=Fishmaydiewithoutwater.Ifyouhelpme,I’llfinishmytaskontime.

=Withyourhelp,I’llfinishmytaskontime.第二十五页，共41页。Activity1Rewritethesentenceswithif:Listeninclass,oryouwon’tunderstandwhattodo.Ifyoudon’t

listeninclass,youwon’tunderstandwhattodo.1)Eatbreakfast,oryou’llgethungryatschool.2)Hurryup!We’llbelate!Ifyoudon’teatbreakfast,you’llgethungryatschool.Ifyoudon’thurryup,we’llbelate.第二十六页，共41页。Activity2.Completethesentences—Iwanttogethighscores.—If__________________________(workhard/dowell)youworkhard,youwilldowell.1.-howcanIremembermyfriends’birthdays?-If_______________________________________(keepanoteinyourdiary/notforget).2.-It’slate,butIdon’twanttogotosleep.-If_______________________________________(notgetenoughsleep/feeltiredatschool).youkeepanoteinyourdiary,youwon’tforget.youdon’tgetenoughsleep,you’llfeeltiredatschool.第二十七页，共41页。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在句中的含义不同第二十八页，共41页。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。第二十九页，共41页。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.Iwanttoknowifthere

asportsmeetingnextmonth.doesn’trainwillbe2.Ifit

doesn’train,we’llgooutIf引导的宾语从句的时态由主句及本身时态决定；第三十页，共41页。1.Canyoutellmeifshecancometothemeeting?2.Shewillnotgothereifitisrainytomorrow.3.Ican’tguessifshewillbeangry.4.Ifwehelpeachother,wewillgetgoodresults.第三十一页，共41页。1

IfI_______________(notunderstand）,Iwillaskmyteacherforhelp.IfI__________(copy)yourhomework,Iwillcheatmyself.3Ifshe_______________(notget)upearly,she’llmisstheearlybus.4Ifyourmother_______(buy)thebookforyou,itwillbegoodforyourstudy.

don’tunderstand

copy

doesn’tget

buys第三十二页，共41页。5.Ifyou____________(notwork)hard,you_________(notpass)theexam.6.Ifyourbrother____________(break)thewindow,hewillfeelverysorryforthat.7.Ifthecomputer

(notwork),menditplease.don’tworkwon’tpassbreaksdoesn’twork第三十三页，共41页。8.Ifshe_______(notbe)interestedinmath,shewillfinditveryboring.9.Ifyou_________(get)highscores,yourparentswillbeproudofyou.10.Ifyou_________(be)happy,wewillbehappy.isn’tgetare

第三十四页，共41页。.Iwanttoknowifhe_______(come)tomorrow,ifhe_______(come),I__________(give)themessagetohim.

comeswillcomewillgive第三十五页，共41页。summaryif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）(3)if从句+主句（含有情态动词）

1.引导宾语从句：译为“是否”，表示不确定的概念。Idon’tknowifyourfathercancometogether.Canyoutellmeifmissyourparents?第三十六页，共41页。HomeworkWriting：任选一个话题，写一篇小文章。要求：不少于字数60词；尽可能多地用条件状语从句来表达。第三十七页，共41页。IfyouarehappyIfyouarehappyandyouknowitclapyourhands

IfyouarehappyandyouknowitclapyourhandsIfyouarehappyandyouknowitneverbeafraidtoshowitIfyouarehappyandyouknowitclapyourhandsIfyouarehappyandyouknowitstompyourfeet.Ifyouarehappyandyouknowitstompyourfeet.IfyouarehappyandyouknowitneverbeafraidtoshowitIfyouarehappyandyouknowitstompyourfeetIfyouarehappyandyouknowitwinkyoureyeIfyouarehappyandyouknowitwinkyoureyeIfyouare