Unit10GrammarIf條件狀語從句課件人教版英語八年級下冊

Unit10Ifyougototheparty,

you'llhaveagreattime!If條件狀語從句1.Tomasterthekeywordsandphrases.

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

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

2.Tolearntotalkaboutconsequences3.Tolearntouseconditionaladverbialclause(條件狀語從句)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.如果你馴服了我，我們就彼此需要了。主情從現(xiàn)01主句含有_____________從句用了_____________情態(tài)動詞一般現(xiàn)在時主將從現(xiàn)如果你馴服了我，我的生活將會充滿陽光。Ifyoutameme,mylifewillbefilledwithsunshine.主句用了_____________從句用了_____________02一般將來時一般現(xiàn)在時If-clauses主祈從現(xiàn)一旦你馴服了什么，就要對她永遠負責。Ifyoutamesomeone,beresponsibleforherforever.03主句用了_____________從句用了_____________祈使句一般現(xiàn)在時If-clausesStructure如果你馴服了我，我的生活將會充滿陽光。Ifyoutameme,mylifewillbefilledwithsunshine.Mylifewillbefilledwithsunshineifyoutameme.1.主句+if從句2.If從句，+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.從句主句如果……,將……一般現(xiàn)在時一般將來時Ifyoudo,you’llbelate.Ifyoudo,you’llbesorry.Iftheyhaveittoday,halftheclasswon’tcome.Ifweaskpeopletobringfood,they’lljustbringpotatochipsandchocolate.簡單句簡單句IfIf

是連詞，意思是如果；假若；倘若通常表示假設(shè)，表示將會發(fā)生和可能發(fā)生的事，或進行提醒警告。類別構(gòu)成例句簡單句TheSimpleSentence一個主語（或并列主語）+一個謂語（或并列謂語）Igetupatsix.MymotherandIoftengoshopping.Somestudentswalkorridebikestoschool.復合句TheComplexSentence一個主句+一個/多個從句Whatdoyouwanttobewhenyougrowup?Ithink(that)

ScreenCityhasthemostcomfortableseats.句子的類型IthinkI'lltakethebustotheparty.Ifyoudo,you'llbelate.IthinkI'llstayathome.Ifyoudo,you'llbesorry.Whatwillhappeniftheyhavethepartytoday？Iftheyhaveittoday,halftheclasswon'tcome.Shouldweaskpeopletobringfood？Ifweaskpeopletobringfood,they'lljustbringpotatochipsandchocolate.Ifyoutakethebustotheparty,you’llbelate.Ifyoustayathome,you’llbesorry.為避免重復,條件狀語從句常用助動詞do(does/did)來替代上文所提到的動作。Whatdidyoufindout?if引導的條件狀語從句的結(jié)構(gòu)和用法一、有些句子可與含if的條件狀語從句互相轉(zhuǎn)換。（1）祈使句+and/or+陳述句。Hurryup,oryou’llmissthetrain.=Ifyoudon’thurryup,you’llmissthetrain.Youwillbehealthierifyoueatwell.=Eatwellandyouwillbehealthier.（2）借助with或without。Youcan’tdrivethecarwiththedooropen.=Youcan’tdrivethecarifthedoorisopen.Ifthereisnowater,fishwilldie.=Fishwilldiewithout

water.

if引導的條件狀語從句的結(jié)構(gòu)和用法Ifyouleavenow,you

arenevergoingto

regretit.(錯誤)Ifyouleavenow,youwillneverregretit.(正確)

二、由連詞if引導的條件狀語從句,主句不能用begoingto表示將來,而應該用shall,will。三.unless(相當于if...not,除非，如果不),aslongas(只要)也可以引導條件狀語從句。Ifitdoesn'traintomorrow,we'llgohiking.=We'llgohikingunlessitrainstomorrow.ButIthinkfriendsarelikebooks---youdon'tneedalotofthemaslongasthey'regood.如果溫度低于零攝氏度,水就會變成冰。Ifthetemperaturet____belowzero,water____(turn)intoice.=Water____(turn)intoiceifthetemperature____belowzero.if引導的條件狀語從句的結(jié)構(gòu)和用法四、表示真實條件、客觀真理、自然現(xiàn)象、定理定義、民間諺語等，句型是：If+句子（一般現(xiàn)在時），+主句（一般現(xiàn)在時）.(即主現(xiàn)從現(xiàn))。必然的結(jié)果theresultthatwillcertainlyhappenisturnsturnsisif條件句不一般，幾個要點記心間；條件句，放在前，逗號要居中間；條件句表可能，主句多用將來時；條件句表事實，主句常用現(xiàn)在時。注意：if還可以用于賓語從句中，表示“是否”，=

whether，引導賓語從句，時態(tài)需根據(jù)語境確定。如：Idon'tknowifhewillcometomorrow.Ifhecomes，Iwilltellyou.我不知道他明天是否會來。如果他來，我就會告訴你。(前一個if表示“是否”，引導賓語從句；后一個if表示“如果”，引導條件狀語從句)Grammarfocusif引導的賓語從句if引導的條件狀語從句含義是否如果位置主句+

if

...If

...,+主句/主句+

if

...時態(tài)主句現(xiàn)在，從句隨便主句過去，從句隨變主句將來，從句現(xiàn)在，即“主將從現(xiàn)”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引導的條件狀語從句，主句用一般將來時，從句用一般現(xiàn)在時?？谠E：“主將從現(xiàn)”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...從...訂購某物2.ordern.順序，命令inorder按順序，有條理inorderto為了3.orderv.命令，訂購ordersb.todosth.un.apieceofchocolatetoo+adj./adv.+todosth.太...而不能givesb.sth.=givesth.tosb.win贏得（比賽、獎品、游戲）beat打敗某人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.難過；失望；沮喪advicen.勸告；建議someadvice一些建議advice是不可數(shù)名詞，“一個建議’’：apieceofadvice，“兩個建議”：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(連鎖反應)”or“ButterflyEffect（蝴蝶效應）”.SummaryIf引導的條件狀語從句的時態(tài)1.當主句用一般將來時時，if引導的條件狀語從句用一般現(xiàn)在時。(即主將從現(xiàn))2.如果主句是祈使句，那么從句通常也是一般現(xiàn)在時。(即主祈從現(xiàn))3.如果主句是含有must，can，may等情態(tài)動詞時，根據(jù)需要從句多用一般現(xiàn)在時。(即主情從現(xiàn))4.表示真實條件、客觀真理、自然現(xiàn)象、定理定義、民間諺語等，句型是：If+句子（一般現(xiàn)在時），+主句（一般現(xiàn)在時）.(即主現(xiàn)從現(xiàn))注意：if還可以用于賓語從句中，表示“是否”，=

whether，引導賓語從句，時態(tài)需根據(jù)語境確定。Grammar句子類型

條件狀語從句

簡單句復合句連接詞：if時態(tài)：主將從現(xiàn),主情從現(xiàn)，主祈從現(xiàn)句子轉(zhuǎn)換：1.祈使句+and/or+陳述句表示條件ExercisesExercise單擊輸入您的封面副標題1.Ithinkmymother________ifshe_______freetomorrow.A.willcome;isB.comes;isC.comes;willbeD.willcome;willbe2.Ifshelikesit,she_______itsoon.A.readB.readsC.willreadD.readingI.單項選擇題。ExercisesExercise單擊輸入您的封面副標題3.Hewillgooutwithyouafterhe_______hishomework.A.finishesB.willfinishC.isfinishingD.finish3.解析：

在after引導的時間狀語從句中，主句用一般將來時，從句用一般現(xiàn)在時表示將來；he為第三人稱單數(shù)，故選A。4.Iwillsendyouane-mailassoonasI______inCanada.

A.arriveB.arrivedC.amarrivingD.willarrive4.【解析】本題考查狀語從句的時態(tài)。當主句是將來時態(tài)時，狀語從句用一般現(xiàn)在時來表將來，所以選擇答案A。ExercisesExercise單擊輸入您的封面副標題II.用所給詞的適當形式填空。If

he

_______(come)totheparty,he