七年级英语下册语法课件

GrammarcoursewareforGrade7EnglishVolume2CATALOGUE目录ThePluralFormNounsThepresentcontinuoustenseofverbsThecomparativeandsuperlativeformsofadjectivesTheusageofprepositionsObjectclauseadverbialclauseofcondition01ThePluralFormNounsWeaknounsformtheirpluralsbyadding-sor-es.Example:cat(singular)-cats(plural).Otherexamples:dog,fox,box.weakconjugationSomenounshaveirregularpluralforms.Example:man(singular)-men(plural).Otherexamples:woman,child,tooth,foot.IrregularchangesExample:mouse(singular)-mice(plural).Otherexamples:louse,roof,hoof.Somenounshavespecialpluralforms.Specialcircumstances02Thepresentcontinuoustenseofverbs总结词掌握现在进行时态的定义和结构是学习英语语法的基础。详细描述现在进行时态表示正在进行的动作或状态，其基本结构为“be动词+动词的现在分词”。常用的助动词包括“am”、“is”、“are”、“was”、“were”，动词的现在分词形式通常是在动词后面加“-ing”。DefinitionandStructure通过例句掌握现在进行时态的用法是关键。总结词现在进行时态常用于描述当前正在发生的动作，如“IamstudyingEnglishnow”。也可以表示即将发生的动作，如“SheisleavingforNewYorknextweek”。此外，还可以用于描述现阶段反复发生的动作，如“WearemeetingeveryTuesday”。详细描述Usageandexamplesentences总结词理解现在进行时态与一般现在时态的区别是避免语法错误的重点。要点一要点二详细描述现在进行时态与一般现在时态都表示现在的状态或动作，但两者用法有所不同。一般现在时态表示经常性、习惯性的动作或状态，如“Iusuallywalktoschool”。而现在进行时态强调当前正在发生的动作或状态，如“Iamwalkingtoschoolnow”。此外，一般现在时态也可以表示将来的动作或状态，如“Thetrainleavesat10:00tomorrow”。Thedifferencefromthesimplepresenttense03ThecomparativeandsuperlativeformsofadjectivesForexample,"happy"becomes"happier"and"happiest".Weakconjugationreferstotheformationofthecomparativeandsuperlativeformsofadjectivesbyadding"-er"and"-est"totheendoftheadjective.Thisruleappliestomostadjectives,butthereareexceptions.WeakconjugationSomeadjectiveshaveirregularchangesintheircomparativeandsuperlativeforms.Thesechangesarenotconsistentandmustbememorized.Forexample,"good"becomes"better"and"best",while"bad"becomes"worse"and"worst".IrregularchangesThecomparativeformisusedtocomparetwothingsorpeople,showingthedifferenceinqualityorquantity.Thesuperlativeformisusedtocomparemorethantwothingsorpeople,showingthehighestorlowestqualityorquantity.Examplesentences:"Sheistallerthanhersister."(comparativeform)and"Thisisthetallestbuildinginthecity."(superlativeform).Comparativeandsuperlativeusageandexamplesentences04TheusageofprepositionsPrepositionsarecommonlyusedtodescribetimerelationships.Prepositionslike"before,""after,""at,"and"in"areoftenusedtospecifyatimeframeoreventorder.Forexample,"Iwillmeetyouafterthemovie"or"Iwillarriveat5o'clock."RepresentingtimePrepositionsareusedtospecifypositionsorlocations.Commonprepositionsforindicatinglocationinclude"in,""on,""under,"and"nextto."Forinstance,"Thebookisonthetable"or"Thecatisunderthebed."IndicatinglocationPrepositionscanbeusedtoshowmovementordirection.Prepositionslike"to,""towards,"and"from"areoftenusedtoindicateadestinationormovement.Forexample,"Iamgoingtowardsthepark"or"ShecamefromNewYork."Indicatingdirection05Objectclause宾语从句是一种句子结构，其中宾语是一个完整的句子。定义宾语从句通常紧跟在动词或介词之后，使用连词引导。结构DefinitionandStructure常用的引导词包括that、what、which、who、when、where等。使用正确的引导词是构建宾语从句的关键，需根据从句的内容和上下文选择合适的引导词。Usageofguidewords注意事项使用引导词Notesandexamplesentences注意事项在宾语从句中，需要注意时态和语序，通常使用陈述句语序，并保持时态一致。例句Idon'tknowwherehelives.(我不知道他住在哪里。)06adverbialclauseofcondition条件状语从句的定义和结构总结词条件状语从句用于表示某个条件下的结果或假设情况，其结构通常由引导词"if"或"unless"以及一个从句组成。详细描述DefinitionandStructureVS条件状语从句中常用引导词的用法详细描述在条件状语从句中，常用的引导词有"if"、"unless"、"incase"、"providedthat"等，它们用于引导条件状语从句，表示某个条件下的结果或假设情况。总结词Usageo