Unit10GrammarIf条件状语从句课件人教版英语八年级下册

Unit10Ifyougototheparty,

you'llhaveagreattime!If条件状语从句1.Tomasterthekeywordsandphrases.

meeting,half,video,organize,order,potatochips,chocolate,

haveagreattime,ordersth.from…,asksb.todosth.,too…to…

2.Tolearntotalkaboutconsequences3.Tolearntouseconditionaladverbialclause(条件状语从句)andmodalverb“should”.LearningobjectivesIfYouAreHappyIfyou'rehappyandyouknowitclapyourhands

Ifyou'rehappyandyouknowitclapyourhands

Ifyou'rehappyandyouknowitandyoureallywanttoshowit

Ifyou'rehappyandyouknowitclapyourhands

Ifyou'rehappyandyouknowitstampyourfeet

Ifyou'rehappyandyouknowitstampyourfeet

Ifyou'rehappyandyouknowitandyoureallywanttoshowit

Ifyou'rehappyandyouknowitstampyourfeet

Ifyou'rehappyandyouknowitshout“Hurray”

Ifyou'rehappyandyouknowitshout“Hurray”

Ifyou'rehappyandyouknowitandyoureallywanttoshowit

Ifyou'rehappyandyouknowitshout“Hurray”Let'ssinganddancetogether!Enjoyavideoandfindoutalltheif-clauses！If-clausesIfyoutameme,thenweshallneedeachother.如果你驯服了我，我们就彼此需要了。主情从现01主句含有_____________从句用了_____________情态动词一般现在时主将从现如果你驯服了我，我的生活将会充满阳光。Ifyoutameme,mylifewillbefilledwithsunshine.主句用了_____________从句用了_____________02一般将来时一般现在时If-clauses主祈从现一旦你驯服了什么，就要对她永远负责。Ifyoutamesomeone,beresponsibleforherforever.03主句用了_____________从句用了_____________祈使句一般现在时If-clausesStructure如果你驯服了我，我的生活将会充满阳光。Ifyoutameme,mylifewillbefilledwithsunshine.Mylifewillbefilledwithsunshineifyoutameme.1.主句+if从句2.If从句，+主句GrammarFocusIthinkI'lltakethebustotheparty.____youdo,_______belate.IthinkI'llstayathome.____youdo,_______besorry.What____happen____theyhavethepartytoday?____theyhaveittoday,halftheclass_______come.Shouldweaskpeopletobringfood?_____weaskpeopletobringfood,______justbringpotatochipsandchocolate.you'llIfyou'llIfwon'tIfthey'llIfwillifIfyoudo,you’llbelate.Ifyoudo,you’llbesorry.Iftheyhaveittoday,halftheclasswon’tcome.Ifweaskpeopletobringfood,they’lljustbringpotatochipsandchocolate.从句主句如果……,将……一般现在时一般将来时Ifyoudo,you’llbelate.Ifyoudo,you’llbesorry.Iftheyhaveittoday,halftheclasswon’tcome.Ifweaskpeopletobringfood,they’lljustbringpotatochipsandchocolate.简单句简单句IfIf

是连词，意思是如果；假若；倘若通常表示假设，表示将会发生和可能发生的事，或进行提醒警告。类别构成例句简单句TheSimpleSentence一个主语（或并列主语）+一个谓语（或并列谓语）Igetupatsix.MymotherandIoftengoshopping.Somestudentswalkorridebikestoschool.复合句TheComplexSentence一个主句+一个/多个从句Whatdoyouwanttobewhenyougrowup?Ithink(that)

ScreenCityhasthemostcomfortableseats.句子的类型IthinkI'lltakethebustotheparty.Ifyoudo,you'llbelate.IthinkI'llstayathome.Ifyoudo,you'llbesorry.Whatwillhappeniftheyhavethepartytoday？Iftheyhaveittoday,halftheclasswon'tcome.Shouldweaskpeopletobringfood？Ifweaskpeopletobringfood,they'lljustbringpotatochipsandchocolate.Ifyoutakethebustotheparty,you’llbelate.Ifyoustayathome,you’llbesorry.为避免重复,条件状语从句常用助动词do(does/did)来替代上文所提到的动作。Whatdidyoufindout?if引导的条件状语从句的结构和用法一、有些句子可与含if的条件状语从句互相转换。（1）祈使句+and/or+陈述句。Hurryup,oryou’llmissthetrain.=Ifyoudon’thurryup,you’llmissthetrain.Youwillbehealthierifyoueatwell.=Eatwellandyouwillbehealthier.（2）借助with或without。Youcan’tdrivethecarwiththedooropen.=Youcan’tdrivethecarifthedoorisopen.Ifthereisnowater,fishwilldie.=Fishwilldiewithout

water.

if引导的条件状语从句的结构和用法Ifyouleavenow,you

arenevergoingto

regretit.(错误)Ifyouleavenow,youwillneverregretit.(正确)

二、由连词if引导的条件状语从句,主句不能用begoingto表示将来,而应该用shall,will。三.unless(相当于if...not,除非，如果不),aslongas(只要)也可以引导条件状语从句。Ifitdoesn'traintomorrow,we'llgohiking.=We'llgohikingunlessitrainstomorrow.ButIthinkfriendsarelikebooks---youdon'tneedalotofthemaslongasthey'regood.如果温度低于零摄氏度,水就会变成冰。Ifthetemperaturet____belowzero,water____(turn)intoice.=Water____(turn)intoiceifthetemperature____belowzero.if引导的条件状语从句的结构和用法四、表示真实条件、客观真理、自然现象、定理定义、民间谚语等，句型是：If+句子（一般现在时），+主句（一般现在时）.(即主现从现)。必然的结果theresultthatwillcertainlyhappenisturnsturnsisif条件句不一般，几个要点记心间；条件句，放在前，逗号要居中间；条件句表可能，主句多用将来时；条件句表事实，主句常用现在时。注意：if还可以用于宾语从句中，表示“是否”，=

whether，引导宾语从句，时态需根据语境确定。如：Idon'tknowifhewillcometomorrow.Ifhecomes，Iwilltellyou.我不知道他明天是否会来。如果他来，我就会告诉你。(前一个if表示“是否”，引导宾语从句；后一个if表示“如果”，引导条件状语从句)Grammarfocusif引导的宾语从句if引导的条件状语从句含义是否如果位置主句+

if

...If

...,+主句/主句+

if

...时态主句现在，从句随便主句过去，从句随变主句将来，从句现在，即“主将从现”例句Iwonderifitwillraintomorrow.Iwonderedifhewasfree.Iwillstayathome

ifitrainstomorrow.PracticeFillintheblanks.1.Ifyouexercisemore,you______(be)muchhealthier.2.Ifit______(rain)tomorrow,they_________(notplay)soccerafterschool.3.Youshouldseeadentistifyou_____(have)atoothache.4.Ifhe_____(walk)toschool,it________(take)himtoomuchtime.willbewon’tplayhavewalkswilltakerains5.Ifyou________(notgo)tobedearlier,you_______(feel)tiredinthemorning.6.Ifit__________(notrain),he________(play)basketballwithmetomorrow.7.IfUncleIan______(come),I________(call)youup.8.Pleasewakemeupifhe_______(come)back.doesn’tgowillfeeldoesn’trainwillplaycomeswillcallcomesJeff:Hey,Ben.Forthepartynextweek,shouldweaskpeopletobringfood?

Ben:

No,let’sorderfoodfromarestaurant.Ifweaskpeopletobringfood,they’lljustbringpotatochipsandchocolatebecausethey’llbetoolazytocook.Jeff:OK.Forthegames,doyouthinkweshouldgivepeoplesomesmallgiftsiftheywin?Ben:

Ithinkthat’sagreatidea!Ifwedothat,morepeoplewillwanttoplaythegames.Jeff:Yes,thegameswillbemoreexciting,too.2dListentothetapeandunderlinethe“if-clauses”.if引导的条件状语从句，主句用一般将来时，从句用一般现在时。口诀：“主将从现”2dReadtheconversationaloudandanswerthequestions.1.WhatareJeffandBentalkingabout?2.WhatwillhappenifBenandJeffaskpeopletobringfood?3.Willtheygivepeoplesomegiftsiftheywinthegames?Why?Foodandgamesforthepartynextweek.Iftheyaskpeopletobringfood,they’lljustbringpotatochipsandchocolatebecausethey’llbetoolazytocook.Yes,theywill.Becauseiftheydothat,morepeoplewillwanttoplaythegames.2dRole-playtheconversationandunderlinethelanguagepoints.Jeff:Hey,Ben.Forthepartynextweek,shouldweaskpeopletobringfood?

Ben:No,let’sorderfoodfromarestaurant.Ifweaskpeopletobringfood,they’lljustbringpotatochipsandchocolatebecausethey’llbetoolazy

tocook.Jeff:OK.Forthegames,doyouthinkweshouldgivepeoplesomesmallgiftsiftheywin?Ben:Ithinkthat’sagreatidea!Ifwedothat,morepeoplewillwanttoplaythegames.Jeff:Yes,thegameswillbemoreexciting,too.asksb.todosth.要某人去做某事1.ordersth.from...从...订购某物2.ordern.顺序，命令inorder按顺序，有条理inorderto为了3.orderv.命令，订购ordersb.todosth.un.apieceofchocolatetoo+adj./adv.+todosth.太...而不能givesb.sth.=givesth.tosb.win赢得（比赛、奖品、游戏）beat打败某人JeffandBenareorganizingaparty.Theywill______foodfromarestaurantfortheparty.______theyaskpeopleto_______foodtotheparty,they_____justbring___________and________becausethey’llbe_____lazy____cook.Forthepartygames,they_____givepeoplesomesmallgifts_____theywin.Iftheydothat,morepeople______wanttoplaythegamesandthegames______bemore________.orderIfbringpotatochipschocolateexcitingwilltootowillifwillwillRetelltheconversation.DearSuMei,Idon’t_______(know)whatto______(do)aboutgoingtoMike’sbirthdaypartytomorrownight.Myparents______(think)IshouldstudyformyEnglishexamnextweek.IfI_____(go)totheparty,they______(be)upset.Mike______(tell)ustowearniceclothes,butIdon’t______(have)any.IfI______(wear)jeans,I_______(look)theworst.Also,I’mnotsurehowto______(go)totheparty.IfI_______(walk),it________(take)metoolong.IfI_______(take)thetaxi,it_______(be)tooexpensive.Canyougivemesomeadviceplease?Tina3aFillintheblankswiththecorrectformsoftheverbsinbrackets.knowdothinkgowillbetoldhaveweargowalkwilltaketakewillbewilllookupsetadj.难过；失望；沮丧advicen.劝告；建议someadvice一些建议advice是不可数名词，“一个建议’’：apieceofadvice，“两个建议”：twopiecesofadvice.3bCompletethesentencesusingyourownideas.1.IfIgetuplatetomorrow,___________________________2.IfIdon’tfinishmyhomework,______________________3.IfIdon’tgetenoughexercise,_______________________4.Iwillnothaveenoughtimetostudyif____________________________________________5.Iwillnotmakeanyfriendsif_______________________________________I’llbelateforschool.myteacherwillbeupset.I’llbecomeveryheavy.Iplaycomputergamesafterschooleveryday.Idon’tgotomyfriends’parties.3cWriteastorywithyourgrouponapieceofpaper.Thefirstpersonbeginsthestorywith“IthinkIwill…”Theothersaddsentenceswith“if”.Passthepaperaroundtwice.Thenreadthestory.A:IthinkIwillgotothemoviestonight.B:IfIgotothemovies,Iwon’tfinishmyhomework.C:IfIdon’tfinishmyhomework…Itiscalled“ChainReaction(连锁反应)”or“ButterflyEffect（蝴蝶效应）”.SummaryIf引导的条件状语从句的时态1.当主句用一般将来时时，if引导的条件状语从句用一般现在时。(即主将从现)2.如果主句是祈使句，那么从句通常也是一般现在时。(即主祈从现)3.如果主句是含有must，can，may等情态动词时，根据需要从句多用一般现在时。(即主情从现)4.表示真实条件、客观真理、自然现象、定理定义、民间谚语等，句型是：If+句子（一般现在时），+主句（一般现在时）.(即主现从现)注意：if还可以用于宾语从句中，表示“是否”，=

whether，引导宾语从句，时态需根据语境确定。Grammar句子类型

条件状语从句

简单句复合句连接词：if时态：主将从现,主情从现，主祈从现句子转换：1.祈使句+and/or+陈述句表示条件ExercisesExercise单击输入您的封面副标题1.Ithinkmymother________ifshe_______freetomorrow.A.willcome;isB.comes;isC.comes;willbeD.willcome;willbe2.Ifshelikesit,she_______itsoon.A.readB.readsC.willreadD.readingI.单项选择题。ExercisesExercise单击输入您的封面副标题3.Hewillgooutwithyouafterhe_______hishomework.A.finishesB.willfinishC.isfinishingD.finish3.解析：

在after引导的时间状语从句中，主句用一般将来时，从句用一般现在时表示将来；he为第三人称单数，故选A。4.Iwillsendyouane-mailassoonasI______inCanada.

A.arriveB.arrivedC.amarrivingD.willarrive4.【解析】本题考查状语从句的时态。当主句是将来时态时，状语从句用一般现在时来表将来，所以选择答案A。ExercisesExercise单击输入您的封面副标题II.用所给词的适当形式填空。If

he

_______(come)totheparty,he