寒假自習(xí)課 2025春初中英語八年級下冊滬教版上課課件 7.2 Grammar

英語（牛津版）八年級下冊EnglishUnit7GrammarTheunknownworld1.As

all

the

seats

were

full

he

stood

up.2.

The

country

is

not

strong

because

it

is

large.

3.Thisboydidn’tdohishomeworkbecauseofskating.4.Iwaslatebecauseoftheheavytraffic.5.Since

/As

we’ve

no

money,

we

can’t

buy

it.

6.Sinceeveryoneishere,let’sstartthemeeting.Readandpayattentiontothewordsinred:WecallthesesentencesAdverbialclausesofreason.(原因狀語從句）Adverbialclausesofreasontelluswhythingshappen.Weusuallyusebecause,as

andsincetostartadverbialclausesofreason.AdverbialclausesofreasonAdverbialclauseofreasonMainclauseBecausenooneelsesawthesealiens,Irefusetobelieveyou.AsSinceWecanalsoputtheadverbialclauseofreasonafterthemainclause.MainclauseAdverbialclauseofreasonIrefusetobelieveyoubecausenooneelsesawthesealiens.assinceThingstorememberWhenweputtheadverbialclauseofreasonatthebeginningofthesentence,weoftenseparateitfromthemainclausewithacomma(,).語法講解A原因狀語從句在句中表示原因、理由的從句叫原因狀語從句。1引導(dǎo)原因狀語從句的從屬連詞主要有because,since,as。2表示語氣的強(qiáng)弱順序是：because﹥since﹥as。3這些連詞都不能和so連用。4當(dāng)原因狀語從句放于句首時，通常要用逗號與主句隔開。引導(dǎo)詞because1because強(qiáng)調(diào)明確直接的因果關(guān)系，回答“why”問題。如：Shedidn’tcometoschoolbecauseshewasill.她沒來上學(xué)是因為病了?！猈hywasheangry?他為什么生氣？—BecauseIwaslate.因為我遲到了。2because從句可與for互換，但for是并列連詞，連接的是并列句，并且在for前必須有逗號隔開。如：Wemuststartearlybecauseitwilltakeus3hourstodrivethere.我們要早點出發(fā)，因為開車去那兒要3個小時。=Wemuststartearly,foritwilltakeus3hourstodrivethere.引導(dǎo)詞since1since表示明擺著的理由或原因，常譯為“既然”。如：Sinceyouhavefinishedyourhomework,youcantakearest.既然你已完成了作業(yè)，那就休息一下吧。2since還可引導(dǎo)時間狀語從句，表示“自從……以來”。如：We’veknowneachothersincewewerechildren.我們從孩提時代起就相識了。

引導(dǎo)詞as1as語氣最弱，表示附帶說明的原因。如：Asyou’rebusy,youneedn’tgotoseehimtoday.你很忙，就沒必要今天去看他了。2as還可引導(dǎo)時間狀語從句，表示“當(dāng)……的時候”、“隨著……”。如：Hedroppedtheglassashestoodup.他站起來時，把杯子摔了。Wegetwiseraswegetold.隨著年齡的增長，我們也變得聰明些了。TomaWeheardsomevoicesspeaking

astrangelanguage.bSheheardaloudnoiselastnight.cNooneelsesawthesealiens.dAnaliensawusandmadeaterriblenoise.PoliceofficerWhywasTinasurethatsomethinglandedintheforestnearthehills?WhydidyouandTinahidebehindsomebushes?3Whydidyourunaway?Whydidyourfatherrefusetobelieveyou?ThepoliceofficeraskedTomsomemorequestionsaboutthealiens.Matchthequestionswiththeanswer.Thenusethemtocompletethepoliceofficer'snoteswithas,sinceorbecause.1（because）TombSheheardaloudnoiselastnight.Policeofficer1WhywasTinasurethatsomethinglandedintheforestnearthehills?Tinawassurethatsomethinglandedintheforestnearthehillsbecausesheheardaloudnoiselastnight.2（as）TinaandIhidbehindsomebushesasweheardsomevoicesspeakingastrangelanguage.TomaWeheardsomevoicesspeakingastrangelanguage.Policeofficer2WhydidyouandTinahidebehindsomebushes?3（Because）Becauseanaliensawusandmadeaterriblenoise,weranaway.TomdAnaliensawusandmadeaterriblenoise.PoliceofficerWhydidyourunaway?4（Since）Sincenooneelsesawthesealiens,ourfatherrefusedtobelieveus.TomcNooneelsesawthesealiens.Policeofficer4Whydidyourfatherrefusetobelieveyou?BecauseofReadthefollowingsentencesandfindthedifference.Timdidn’tgotoschoolyesterdaybecausehewasill.Timdidn’tgotoschoolyesterdaybecauseofhisillness.Wecanalsousebecauseoftogivethereasonforsomething.Theywenttotheforestbecauseoftheircuriosity.Tinawokeupatmidnightbecauseofaloudnoise.Shedecidedtoexploretheforestbecauseofit.Wecanuseanoun,anounphraseora(subjectpronoun/objectpronoun)afterbecauseof.WorkouttheruleBbecause與becauseof的區(qū)別because和becauseof的意思都是“因為；由于”。但because是連詞，其后接句子。becauseof是復(fù)合介詞，其后接名詞、代詞、動名詞、what從句等。如：Shedoesn’tgotoschoolbecausesheisill.=Shedoesn’tgotoschoolbecauseofherillness.她沒來上學(xué)因為她生病了。根據(jù)題目要求，完成下列句子。1.Thefootballmatchwasputoff.Itrained.(用because連接句子)2.Jimcouldn’twalkbecausehislegwasbroken.(用becauseof改寫句子)Jimcouldn’twalk_______________________.3.Manypeoplegiveupsmokingbecausesmokinghasharmfuleffects.(用becauseof改寫句子)Manypeoplegiveupsmoking___________________.becauseofitsharmfuleffectsThefootballmatchwasputoffbecauseitrained./Becauseitrained,thefootballmatchwasputoff.becauseofhisbrokenlegWritesentencesaboutthestoryonpage99byusingbecauseof.1.Tinawassurprised/theyellowlightintheskyTinawassurprisedbecauseoftheyellowlightinthesky.2.Thealienslandedonthisplanet/anaccidentThealienslandedonthisplanetbecauseofanaccident.3.Thechildrenranawayfromtheforest/thealiensThechildrenranawayfromtheforestbecauseofthealiens.4.Theirdadwasnotsureaboutthechildren’sstory/thewritingonthepieceofpaperTheirdadwasnotsureaboutthechildren’sstorybecauseofthewritingonthepieceofpaper.1.Wehavelearnedhowtouseadverbialclausesofreason.2.Wehavelearnedtogivereasonswithbecauseof.一、選擇最佳答案填空。()1.Icalledthepolice____theterriblenoise. A.becauseof B.becauseC.sinceD.as()2.____I’mverytired,Iamgoingtobedearly. A.Until B.As C.ThoughD.While()3.____nooneknowsthetruth,wedon’tbelievewhathesaid. A.WhetherB.WhenC.WhileD.Since()4.Webelievetherearealiens____thesephotosofUFOs. A.sinceB.becauseC.asD.becauseofDABD（二）句型轉(zhuǎn)換。1Thestudentsdidn’tneedtogotoschoolbecausetherewasastorm.Thestudentsdidn’tneedtogotoschool______________thestorm.2Hewasill,sohedidn’tgotoschool.__________________hewasill,hedidn’tgotoschool.3Hecouldn’twalkbecausehislegwasbroken.Hecouldn’twalk________________his_________leg.4Icamebackbecauseitwasrainingheavily.Icameback_______________the________rain.5My