上海教育版英語(yǔ)八年級(jí)下冊(cè)Module 4 Unit 7 第3課時(shí)Grammar教學(xué)課件

Module4DiscoveryUnit7Theunknownworld第3課時(shí)Grammar語(yǔ)法聚焦原因狀語(yǔ)從句1.定義：在句中用來(lái)說(shuō)明主句原因的句子叫原因狀語(yǔ)從句。2.常用引導(dǎo)詞:because(因?yàn)?，since(既然)，as(由于)，for(因?yàn)?3.時(shí)態(tài)：原因狀語(yǔ)從句一般都是根據(jù)實(shí)際情況選用適當(dāng)?shù)臅r(shí)態(tài)，通常是主過(guò)從過(guò)、主現(xiàn)從現(xiàn)。4.because,since,as和for的區(qū)別：(1)because引導(dǎo)的原因狀語(yǔ)從句一般放在主句的后面。當(dāng)它位于句首時(shí)要用逗號(hào)與主句分開(kāi)，放在句中時(shí)可不用逗號(hào)分開(kāi)。because表示直接原因，語(yǔ)氣最強(qiáng)，適用于回答why引導(dǎo)的疑問(wèn)句。注意：because和so不可同時(shí)出現(xiàn)在一個(gè)句子里。如：Wewentbybusbecauseitwascheaper.=Itwascheapersowewentbybus.我們乘公共汽車(chē)去，因?yàn)檫@樣便宜一些?！猈hydon’tyougoouttoplayfootballwithus?你為什么不和我們一起去外面踢足球？—BecauseIhavetolookaftermyyoungersisterathome.因?yàn)槲业迷诩艺疹櫸业拿妹谩?2)since引導(dǎo)的原因狀語(yǔ)從句一般放在主句之前，表示已知的、顯然的理由(通常被翻譯成“既然”，相當(dāng)于nowthat)，較為正式，語(yǔ)氣比because弱。如：Sinceyoudon’ttrusthim,youshouldnotemployhim.既然你不信任他，你就不該雇用他。Nowthatyouhavegrownup,youshouldnotrelyonyourparents.既然你長(zhǎng)大了，就不該依靠你的父母。(3)as引導(dǎo)原因狀語(yǔ)從句時(shí)，表示附帶說(shuō)明的雙方已知的原因，含有對(duì)比說(shuō)明的意味，語(yǔ)氣比since弱，較為正式，位置較為靈活(常放在主句之前)。如：Asitisraining,you’dbettertakeataxi.由于正在下雨，你最好乘坐出租車(chē)。Iwenttobedearly,asIwasexhausted.我睡得早，因?yàn)槲医钇ＡΡM了。(4)for引導(dǎo)的是并列句，表示上文未交代過(guò)的原因，但并不說(shuō)明主句行為發(fā)生的直接原因，只提供一些附加或推斷的理由。for引導(dǎo)的并列句只能放在主句之后，并且必須用逗號(hào)將其與主句隔開(kāi)。如：Hecouldnothaveseenme,forIwasnotthere.他不可能見(jiàn)過(guò)我，因?yàn)槲也辉谀抢铩eseldomgoesoutnow,forheisveryold.他現(xiàn)在很少出門(mén)了，因?yàn)樗晔乱迅摺?.because和becauseof的區(qū)別：(1)because是連詞，其后接原因狀語(yǔ)從句或回答以why開(kāi)頭的特殊疑問(wèn)句。(2)becauseof是復(fù)合介詞，其后接名詞、代詞或動(dòng)名詞。如：Hedidn’tcomebecausehewasill.=Hedidn’tcomebecauseofhisillness.他因病沒(méi)來(lái)。課堂練習(xí)一、選用because，becauseof，since，as，for填空1.—Whyisheunhappy?—____________hefailedtheEnglishexam.2.____________everyoneishere,let’sbeginourdiscussion.3.____________thebadweather,theGreenshadtoputofftheirtravelplan.BecauseSinceBecauseof4.Weshouldbemorecareful,________itisalreadydark.5.________itwasapublicholiday,alltheshopswereshut.6.Hesoldhiscar________itwastoosmall.7.________youwon’thelpme,Imustdothejobbymyself.8.Hehadatrafficaccident__________hiscarelessness.9.Thisis________theEarthistravellingaroundtheSun.10.________Jimwasnotready,wewentwithouthim.forAsbecauseSincebecauseofbecauseAs二、選擇填空()1.—Whywereyoulateforschoolagain?(原創(chuàng)題)—_____Igotuplateandmissedthefirstschoolbus.A.Since B.Because C.As D.Becauseof()2.Allofushadtostayathome_____theCOVID-19duringlastSpringFestival.(原創(chuàng)題)A.becauseof B.as C.for D.sinceBA()3.—_____youarefreetoday,whynotseeamoviewithme?(原創(chuàng)題)—Soundsgreat!A.Since B.For C.As D.Becauseof()4.—_____itisraining,let’stakeataxitoschool.(原創(chuàng)題)—OK！A.Because B.For C.As D.BecauseofAC()5.MissLimustbeintheofficenow,_____thelightsinherofficeareon.(原創(chuàng)題)A.because

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D.sinceB三、語(yǔ)法填空

WewereonourwaybacktotheEarthfromanotherplanet.1._____________(sudden),aUFOappearedanditmadeourspaceshiplandonanotherplanet.Ontheplanet,averystrange-lookingalien2._______(meet)us.Hetookmyfriendsand3.______(my)toseehismaster.Thenwecametoaverystrangeroom.There4._________(be)manyaliensstandinginline.Allthealienshadfoureyes,twoheadsandsixlegs.TheyhadaSuddenlymetmewerewhitebodyandnohair.5.___________oursurprise,we6._____________(call)“aliens”bythem.Theplanetlookedlike7.___________prison(監(jiān)獄).Theygaveussomefood.Nooneatethefoodbecausewewere8.___________(frighten).Thenextday,theygaveusalonglistofthings9.___________(do),butwe