Unit7Theunknownworld语法课件牛津深圳版英语七年级下册

Unit7

Theunknownworld语法原因状语从句(Adverbialclausesofreason)定义在句中用来说明主句原因的从句叫原因状语从句。常用引导词because(因为)，as(由于)，since(既然)，nowthat(既然)时态原因状语从句一般都是根据实际情况选用适当的时态。通常是主过从过，主现从现。原因状语从句(Adverbialclausesofreason)because，since，as和for的区别because引导的原因状语从句一般放于主句的后面，because从句位于句首时与主句要用逗号分开，放在句中时，可不用逗号分开。because表示直接原因，语气最强，用于回答why引导的疑问句。becauseof也表示原因，但它后面不接从句，可以接名词、代词、名词性短语。注意：because和so不可同时出现在一个句子里。Wewentbybusbecauseitwascheaper.＝Itwascheapersowewentbybus.我们乘公交车去，因为这样便宜一些。Hecan'tgotoschooltodaybecauseofhisillness.＝Hecan'tgotoschoolbecauseheisilltoday.他今天病了，不能去上学。—Whynotgoouttoplayfootballwithus?为什么不和我们一起去踢足球呢？—Becausemyparentsarenotathome.Ihavetolookaftermyyoungersister.因为我父母不在家，我得照顾我的妹妹。原因状语从句(Adverbialclausesofreason)because，since，as和for的区别since引导的原因状语从句一般放于主句之前表示已知的、显然的理由(通常被翻译成

“既然”

＝nowthat)，较为正式，语气比because弱。另外，because着重强调原因，since着重强调结果。Sinceyouarefreetoday,youhadbetterhelpmewithmymathematics.既然你今天休息，你最好帮我补习数学。Sinceyoudon'ttrusthim,youshouldnotemployhim.既然你不信任他，你就不该雇用他。Nowthatyouaregrown-up,youshouldnotrelyonyourparents.既然你长大了，就不该依靠你的父母了。原因状语从句(Adverbialclausesofreason)because，since，as和for的区别as引导原因状语从句时表示附带说明的原因(往往为双方已知)，语气比since弱，较为正式，位置较为灵活(常放于主句之前)。另外，与since一样，as侧重强调结果。Asitisraining,you'dbettertakeataxi.由于正在下雨，你最好乘坐出租车。Asyouaretired,youhadbetterhavearest.由于你累了，最好休息一下吧。Iwenttobedearly,asIwasexhausted.我睡得早，因为我筋疲力尽了。原因状语从句(Adverbialclausesofreason)because，since，as和for的区别for连接的是并列分句，表示原因，但并不说明直接原因，只提供一些辅助性的补充说明，或对某种情况加以推断，表示补充说明理由。for连接的并列分句只能放于句子后面。Heseldomgoesoutnow,forheisveryold.他现在难得出门了，因为他年事已高。Hemustbeill,forheisabsenttoday.(mustbe对现在的肯定推测)他一定是生病了，因为他今天没有来。Hecouldnothaveseenme,forIwasnotthere.(couldn'thavedone对过去的否定推测)他不可能见过我，因为我不在那里。一、单项选择()1.(2022•武威)Ihaven'tgotanyapplejuice,

I'vegotsomeorangejuice.Wouldyoulikesome?A．butB．andC．orD．forA()2.(2022•乐山)Don'tbeafraidtomakemistakes,

you'llneverreallylearnthelanguage.A．and B．or C．soB()3.(2022•安徽)Youwon'tfullyexperiencethecultureofaforeigncountry

yougothereinperson.A．because B．unless C．assoonas D．aslongas()4.(2022•江西)

manythingschangealot,aloveofsportshasn'tchangedabit.A．If B．Before C．Though D．BecauseBC()5.(2022•云南)Foryoursafety,youmustn'tgetclosetothetrain

itstops.A．while B．when C．since D．untilD()6.—DidyoureturnFred'scall?—Ididn'tneedto

I'llseehimtomorrow.A．though B．unless C．when D．becauseD()7.

youcan'tanswerthequestion,perhapswe'dbetterasksomeoneelse.A．Until B．SinceC．When D．AsB()8.—Didyouhaveasportsmeetingyesterday?—No，wedidn't.Itwasputoff

theheavyrain.A．insteadof B．becauseofC．asfor D．asB()9.

hewasveryill,hestillwentonworking.A．Because B．ForC．Though D．/()10.(2022•重庆A卷)—Ilikerain

itmakesmefeelcoolandrelaxed.—SodoI.A．or B．becauseC．but D．howeverCB二、选择恰当的连词完成句子(because，as，since，for)1．Ididn'tgotoschoolyesterday___________Iwasill.2．_________everybodyishere,let'sbeginourmeeting.3．Hemighthavegonetobed,

_______thelightwentout.4．______Janewastheoldestinthisfamily,shehadtolookaftertheothers.5．Thedaybreaks,

_______thebirdsaresinging.becauseSinceforAsfor三、语法填空(2022•德阳)阅读下面短文，在空白处填入一个适当的单词或括号内单词的正确形式。WhenIwasachild,Ilovedtovisitmygrandparents'farm.Therewasalwayssomethingnewtodo,1.______(see)andtoenjoy.

toseeOneday,I,togetherwithmybrothersandsisters,wenttomygrandparents'farmtocelebratemybirthday.Wealllikedeatingstrawberriesandwewenttopick2.______(they).Weeachtookabasket.ButIwaslazy.Itookthe3.________(small)basket.Whiletheotherswerepickingstrawberries,Ihadarest.Beforewe4.________(return),IputalotofgrassinmybasketandthenIputafewstrawberriesontop.Thebasketlookedfull.Mygrandfathersaidhewasproud5._____myhardwork.themsmallestreturnedofThenextmorningmygrandmothermademany6.____(pie).Therewasabigpiewhich7._________(make)justforme.Itlookednice!ButwhenIbegantoeatit,Ifoundtherewasnothingbutgrassunderthetopstrawberries!Youcanguess8._____surprisedIwas.Mygrandfatherlookedatme9.______(calm)andsaid,

“Whenyoucheatothers,youcheatyourself.”Hedidn'tneedtosaymorebuttaughtme10.__goodlesson.pieswasmadehowcalmlya课后强化一、根据句意，从括号内选择适当的词语填空1．—Whydoyoulikeyourhistoryteachersomuch?—_________(Because/Since/As)heissuchaninterestingandfriendlyperson.2．_______(Because/Since)everyoneishere,let'sstart.

3．____________(Because/Becauseof)hisbrokenleg,hewasn'tabletoplayinthefootballgamethatday.BecauseSinceBecauseof4．Lindawasangry,

_____(becauseof/for/since)shedidn'tknowwhereherfriendwas.

5．Allofusshouldcaremoreaboutourhealth_________(because/since/for)goodhealthisthefirststeptowardssuccess.

6．_______(For/Since/Becauseof)youhavenotenoughmoney,youcan'tbuythatexpensivecar.

forbecauseSince二、选择最佳选项()7.Thepolicefoundthathedidn'ttellthetruth.

A.remembered B．discoveredC．produced D．made()8.Iwonderwhenitwillsnow.

A．wanttoknow B．thinkC．speak D．sayBA()9.Icalledyoulastnightbutnobodyanswered.

A．someone B．anyoneC．noone D．one()10.Tinawantstoplaybaseball,butLilydisagrees．

A．agrees B．doesn'tagreeC．wants D．speaksCB()11.Timwasfrightenedofthesnake.

A．dared B．afraidC．interested D．like()12.—Ilikeplaying

basketball.Whataboutyou？

—Ilikeplaying

guitar. A.an;an B．an;the C．/;the D．a;/BC()13.—Ihaven't

mypenpal'sletterfortwoweeks.

—Maybeheistoobusyrecently. A．accepted B．received C．written D．collected()14.—ThankstoProjectHope,

childrenhavebetterlives.

—That'sgreat. A．thousandsof B．thousands C．thousand D．thousandofBA()15.—Everythingintheroomlookssonice.

—Yes,that'sbecausethemoonlightisshiningin

thewindow.A．over B．acrossC．through D．past()16.—MoYan'sbookshavebeensoldoutinmanybookstores_____

hiswinningoftheNobelLiteraturePrize.—That'strue.A．because B．sinceC．as D．becauseofCD三、语法填空Metaphor(比喻)isoftenseeninpoetry.Poetsdon't17.______________(direct)talkabouttheirfeelingswhiletheyoftencompareonethingorpersontosomethingelse.directlyThispoemis18.________example.Thehorsegoesthroughthedesert.Itislookingforwardto19._____________(wear)goldengearandrunningfreelyinautumn.LiHe,apoetintheTangDynasty(618-907),usedthehorseasametaphor20.____________(show)hisstrongwishtoputhistalenttogooduseinservinghiscountry.Sadly,itdidn'tcometrue.anwearingtoshowLiw