2025届高三英语一轮定语从句复习课件（内嵌视频）

TheSubjectClauseWhenaSentenceBecomesaSubject探索句子的奥秘——主语从句AThought-ProvokingQuote“Whatyoudotodaycanimproveallyourtomorrows.”思考一下(Thinkaboutit):1.Whatisthesubject(主语)ofthissentence?2.Isitasinglewordoragroupofwords?WhatisaSubjectClause?Definition/定义Asubjectclauseisaclausethatfunctionsasthesubjectofasentence.Itactslikeanoun.主语从句是在句子中充当主语的从句，其语法功能与名词完全相同，因此也被称为“名词性从句”。WhatisaSubjectClause?Structure/结构SubjectClause+Predicate（引导词+从句内容）充当整个句子的主语部分，后跟主句谓语。WhatisaSubjectClause?Examples/示例对比●SimpleSentenceHisideaisbrilliant.（主语：名词短语）●ComplexSentenceThathecameupwiththisideaisbrilliant.（主语：完整句子）TheKey:ChoosingtheRightConjunction从属连词(Subordinating)引导词：that,whether功能：that无意义，仅起连接作用，不可省略；whether表“是否”，起连接作用。充当从句成分？否(No)Thathewonthegamesurprisedeveryone.Whethershewillcomeisstillunknown.TheKey:ChoosingtheRightConjunction连接代词(Pronouns)引导词：what,who,whom,whose,which功能：连接句子+充当主语、宾语、表语或定语。充当从句成分？是(Yes)Whathesaidisveryimportant."What"作said的宾语(Object)TheKey:ChoosingtheRightConjunction连接副词(Adverbs)引导词：when,where,why,how功能：连接句子+充当状语(时间、地点、原因、方式)。充当从句成分？是(Yes)Howhesolvedtheproblemsisamystery."How"作solved的方式状语(Adverbial)thatorwhat?ACommonPuzzlethat—只起连接作用，不充当成分Thatheishonestisknowntoall.💡分析：从句"heishonest"本身结构完整，that仅作为连词连接主从句，不具实际含义，也不充当成分。what—既起连接作用，又充当成分Whathesaidistrue.💡分析：从句中"said"缺宾语，what既连接主从句，又充当"said"的宾语，意为“...的话/内容”。记忆口诀(Mnemonic)·that只连接，what要充当whetherorif?核心规则(Rule)：当引导主语从句作句子主语时，只能用whether，绝对不能用if。正确(Correct)“Whetherwewillgocampingdependsontheweather.”（主语从句作主语✅）错误(Incorrect)“Ifwewillgocampingdependsontheweather.”（主语从句不能用if引导❌）用法拓展(Extension)：`if`仅能引导宾语从句。例：Idon'tknowif/whetherhewillcome.TwoGoldenRules01.语序(WordOrder)主语从句必须使用陈述语序(Subject+Verb)，不可使用疑问语序。Correct:Idon'tknowwhenthemeetingwillstart.Incorrect:Idon'tknowwhenwillthemeetingstart.TwoGoldenRules02.主谓一致(Subject-verbAgreement)当主语从句作句子主语时，整个从句视为一个整体，主句的谓语动词通常要用单数形式(SingularForm)。Whathesaysisnotimportant.Whentheywillarriveisstillaquestion.ChallengeTime!01.______hewillcometothepartyremainsaquestion.A.IfB.ThatC.WhetherD.What02.______surprisedmemostwashisattitudetowardshisstudies.A.ThatB.WhatC.WhichD.Who03.______theearthisroundisafact.A.ThatB.WhatC.IfD.Whether04.______wewillhaveapicnictomorrowdependsontheweather.A.IfB.WhetherC.ThatD.Where05.______hegotsoangryconfusedme.A.whenB.whyC.whatD.whereCorrectAnswers1.C2.B3.A4.B5.BTransformtheSentencesCombinethetwosentencesintooneusingasubjectclause.01Hewillcome.Itiscertain.Thathewillcomeiscertain.(拓展:Itiscertainthathewillcome.)*02Whatdidhesay?Itisnotclear.Whathesaidisnotclear.03Wheredidtheygo?It'sasecret.Wheretheywentisasecret.SummaryWhat:SubjectClauseAtypeofnounclausethatfunctionsasthesubjectofamainclause.How:CommonMarkersIntroducedbythat,whether,orwh-words(what,who,where,etc.).KeyRulestoRemember•Distinguish:thatvs.what|whethervs.if•Syntax:Alwaysusestatementwordorder.•Agreement:Themainverbisusuallyinsingularform.TheSubjectClause(主语从句)1.Definition(定义)Aclausethatactsasthesubjectofacompletesentence.Itfunctionsasanoun.在复合句中充当主语的从句，其功能相当于名词。2.CommonConjunctions(引导词)•That:无意义，不充当成分(e.g.,Thatheislateistrue.)•Whether:表“是否”，不充当成分(e.g.,Whetherhewillcomeisunknown.)•Wh-words:在从句中充当成分(e.g.,Whathesaidisimportant.)3.KeyRules(关键规则)✅StatementWord