Unit6语法专项课件原因状语从句V-ing形式及状语从句北师大版八年级英语下册

教学课件北师大英语八年级下册Unit6语法专项——原因状语从句、V-ing形式及状语从句

全解精讲+分层练习

学习目标1.掌握because/since/as的用法区别，能正确引导原因状语从句2.熟记V-ing形式作主语、宾语的规则，能完成词形变化3.理解状语从句的不同类型，熟练运用常见引导词4.能独立完成本单元语法的各类基础题型，规避常见错误

语法一原因状语从句定义与核心功能原因状语从句用于说明主句动作发生的原因或理由由特定引导词连接，从句与主句构成“因果逻辑”从句可位于主句前或后，位置不同标点有差异核心引导词：because,since,as，语气和用法各有侧重例句：Hestayedathomebecausehewasill.（说明stayathome的原因）原因状语从句引导词用法（一）：becausebecause语气最强，表“因为”，用于强调直接、明确的原因可单独回答why引导的问句，这是其独有的功能通常位于主句后，若位于句首需用逗号与主句隔开例句：Whydidn'tyoucome?→BecauseIwasbusy.例句：Shecriedbecauseshelostherfavoritebook.注意：because不可与so同时使用原因状语从句引导词用法（二）：since/assince语气次之，表“既然”，引导已知、显而易见的原因通常位于句首，主句表推论或建议，逻辑更侧重“基于原因的结果”例句：Sinceyouknowtheanswer,pleasetellus.as语气最弱，表“由于”，引导较轻微、附带的原因位置灵活，可前可后，从句简短，常置于句首例句：Asitwasraining,wetookabus.；Wetookabusasitwasraining.原因状语从句引导词对比表引导词语气强度核心含义位置特点例句because最强因为（直接原因）多句后，可答whyHeleftbecausehewasangry.since中等既然（已知原因）多句首Sinceyou'refree,helpme.as最弱由于（轻微原因）可前可后，句首居多Asit'slate,Imustgo.语法一小练手·引导词填空1.Ididn'tgototheconcert__________Ihadtopreparefortheexam.2.__________youhavefinishedyourhomework,youcanwatchTVforawhile.3.Shedidn'teatbreakfast__________shegotuptoolate.4.__________theweatherisbad,wehavetocancelthepicnic.5.Hesucceeded__________heworkedveryhard.becauseSincebecauseAsbecause语法二V-ing形式定义与核心用法V-ing形式是动词的-ing形式，兼具动词和名词的特征核心用法：作主语、作介词宾语、作特定动词的宾语在句中可表达动作或事件，语法功能灵活使用时需注意动词的固定搭配，无人称和数的变化例句：Readingismyhobby.（作主语）；Ilikeswimming.（作宾语）V-ing形式用法（一）：作主语V-ing形式作主语，表泛指的动作或抽象概念谓语动词用单数形式，不可用复数可置于句首，也可用it作形式主语，将真正主语后置例句：LearningEnglishisnoteasy.；It'sfunplayinggames.常见句型：It's+adj./n.+doingsth.（作形式主语）V-ing形式用法（二）：作介词宾语所有介词（after,by,about,of,in等）后接动词时，需用V-ing形式这是固定规则，无例外情况常见介词短语搭配：begoodatdoing,beinterestedindoing,lookforwardtodoing例句：Afterfinishinghomework,hewentout.；Sheisgoodatsinging.V-ing形式用法（三）：作动词宾语部分动词后只能接V-ing形式作宾语，需重点记忆常见此类动词：enjoy,finish,mind,practice,suggest,avoid等例句：Ienjoylisteningtomusic.；Hefinishedwritingtheletter.注意：此类动词后不可接不定式（todo），需牢记固定搭配V-ing形式高频搭配与例句用法类型搭配结构例句作主语V-ing+单数谓语Playingfootballisexciting.介词宾语介词

+V-ingHeisafraidofspeakingEnglish.动词宾语固定动词

+V-ingShepracticesdancingeveryday.形式主语It's+adj.+V-ingIt'simportantlearningfrommistakes.语法二小练手·词形填空1.__________(read)inbedisbadforyoureyes.2.Ilookforwardto__________(see)yousoon.3.Sheisinterestedin__________(paint)pictures.4.Hefinished__________(do)hishomeworkat8o'clock.5.Mymothersuggests__________(go)totheparkthisweekend.Readingseeingpaintinggoinggoing语法三状语从句定义与常见类型状语从句用于修饰主句的动词、形容词或副词说明时间、原因、结果、条件、让步等逻辑关系从句由引导词引导，结构完整，需遵循特定时态规则本单元重点复习巩固三类核心状语从句：1.时间状语从句（when,while,until）2.原因状语从句（because,since,as）3.结果状语从句（so...that...,such...that...）状语从句类型与引导词（一）从句类型常见引导词核心功能例句时间状语从句when,while,until,after说明动作发生的时间IwillcallyouwhenIarrive.原因状语从句because,since,as说明动作发生的原因Hedidn'tcomebecausehewasill.状语从句类型与引导词（二）从句类型常见引导词核心功能例句结果状语从句so...that...,such...that...说明动作产生的结果Heissotallthathecanreachit.条件状语从句if,assoonas说明动作发生的条件Ifyouworkhard,youwillsucceed.状语从句核心时态规则1.时间/条件状语从句：主句为将来时，从句用一般现在时表将来（主将从现）例句：IwillgowithyouifIhavetime.；Assoonashecomes,Iwilltellyou.2.原因/结果状语从句：主从句时态保持一致，根据实际语境判断例句：Hewassadbecausehefailedtheexam.；Sheissohappythatshecries.状语从句易混点对比（when/while）when可接延续性或非延续性动词，从句动作可长可短可用于主句和从句动作同时发生或先后发生例句：WhenIwasreading,hecamein.；WhenIgotup,itwasraining.while接延续性动词，从句动作持续一段时间强调主句和从句动作同时进行例句：Whileshewascooking,Iwascleaningtheroom.语法三小练手·引导词填空1.Iwillwaitforyou__________youcomeback.2.Hewas__________tired__________hefellasleepimmediately.3.__________youstudyhard,youwillpasstheexam.4.Ididn'tgotobed__________Ifinishedmyhomework.5.Shecried__________shecouldn'tfindhermother.untilsothatIfuntilbecause单元语法综合小练·单选（一）1.Hedidn'tgotoschool__________hehadabadcold.A.soB.becauseC.butD.and2.Ienjoy__________Englishsongsinmyfreetime.A.singB.tosingC.singingD.sang3.__________youarefree,whynothelpmewithmyhomework?A.SinceB.BecauseC.AsD.IfBCA单元语法综合小练·单选（二）4.Iwillcallyou__________IgettoBeijing.A.whileB.whenC.untilD.as5.It'simportant__________hardatschool.A.studyB.tostudyC.studyingD.studied6.Hewas__________excited__________hecouldn'tsayaword.A.so;thatB.such;thatC.too;toD.enough;toBCA单元语法综合小练·句型转换（一）1.Hestayedathomebecausehewasill.（对画线部分提问）→__________didhestayathome?2.Ienjoyplayingbasketball.（改为同义句）→Ilike__________basketball.3.Ifyouworkhard,youwillsucceed.（改为同义句）→Workhard,__________youwillsucceed.Whyplayingand单元语法综合小练·句型转换（二）4.Shefinishedherhomeworkandwenttobed.=____________________herhomework,shewenttobed.5.Themovieisveryinteresting.Wealllikeit.=Themovieis__________interesting__________wealllikeit.6.Hedidn'tgooutbecauseoftherain.（改为原因状语从句）=Hedidn'tgoout__________itrained.Afterfinishingsothatbecause单元语法综合练习题（一）一、用适当的引导词填空（原因/状语从句）1.Hedidn'tcometotheparty__________hewasbusywithhiswork.2.__________thesunisshining,let'sgoforawalk.3.Iwillnotleave__________youcomeback.4.Shewas__________happy__________shejumpedupanddown.5.__________youdon'thurry,youwillmissthebus.becauseSinceuntilsothatIf单元语法综合练习题（二）二、用所给词的适当形式填空6.__________(learn)aforeignlanguageisveryimportant.7.Myfatherisgoodat__________(cook)deliciousfood.8.After__________(watch)TV,hedidhishomework.9.Sheavoids__________(make)mistakesinherhomework.10.Ilookforwardto__________(receive)youremail.Learningcookingwatchingmakingreceiving单元语法综合练习题（三）三、句型转换11.Hedidn'tgotoschoolbecausehewasill.（改为同义句）→Hewasill,__________hedidn'tgotoschool.12.Ifinishedmyhomeworkandwenttobed.（用after合并）→AfterI__________myhomework,Iwenttobed.13.TheboxissoheavythatIcan'tcarryit.（改为同义句）→Theboxis__________heavyforme__________carry.sofinishedtooto单元语法综合练习题（四）四、单项选择14.__________heisyoung,heknowsalotofthings.A.ThoughB.BecauseC.SinceD.As15.Sheenjoys__________tomusiceveryday.A.listenB.tolistenC.listeningD.listened16.Iwillcallyou__________Iarriveattheairport.A.whenB.whileC.untilD.assoonas17.Hedidn'tpasstheexam__________hedidn'tstudyhard.A.soB.becauseC.butD.and18.It'stoolate,__________wehavetogohomenow.A.soB.becauseC.butD.andACABA单元语法综合练习题（五）五、句型转换19.Theywillgototheparkifitdoesn'train.（改为同义句）→Theywillgotothepark__________itrains.20.LearningEnglishisinteresting.（改为感叹句）→__________interesting__________Englishis!21.Shewaslatebecauseshemissedthebus.（对画线部分提问）→__________was