Unit6语法专项-Itisadjto-infinitive课件-译林英语八年级下册

教学课件译林英语八年级下册

Unit6语法专项——Itis+adj.+(for/ofsb.)+to-infinitive

全解精讲+分层练习学习目标掌握三种核心句型的结构、含义及用法区别能准确区分forsb.与ofsb.的用法场景牢记两类句型常用形容词，规范造句完成多样题型练习，灵活运用句型改写、填空能结合语境，正确选择句型表达观点与评价句型引入·为什么要学这个句型英语中，动词不定式（todo）作主语时，句子易头重脚轻本句型用It作形式主语，替代真正主语（todo）让句子结构更简洁、表达更自然，是初中高频考点核心作用：表达对事情的看法或对人的评价分为三种基础形式，逐步拓展学习核心句型1Itis+adj.+to-infinitive基础结构：Itis+形容词+todosth.核心解析：It是形式主语，无实际含义真正主语：后面的动词不定式（todosth.）功能：表达对“做某事”的客观看法或评价形容词特点：描述事情的性质、特点（如难易、好坏）句型1例句精讲+结构拆解1.Itisusefultolearnasecondlanguage.译文：学习一门第二语言是有用的。拆解：It（形式主语）+isuseful（表语）+tolearn...（真正主语）2.Itisinterestingtoplaybasketballafterschool.译文：放学后打篮球很有趣。拆解：形式主语It替代toplay...，避免句子开头过长句型1易错点提醒易错1：遗漏形式主语It，直接用todo开头（不常用）错误：TolearnEnglishisimportant.（语法正确但不自然）正确：ItisimportanttolearnEnglish.易错2：混淆is的用法，主语是It，be动词用is错误：Itarenecessarytoexerciseeveryday.正确：Itisnecessarytoexerciseeveryday.核心句型2Itis+adj.+forsb.+to-infinitive拓展结构：Itis+形容词+forsb.+todosth.核心解析：forsb.明确“做某事的人”，即动作发出者功能：描述“对某人来说，做某事是怎样的”形容词特点：描述事情的客观属性（难易、重要性等）sb.用宾格形式（如me,him,them,us）句型2常用形容词+例句精讲常用形容词：important,necessary,difficult,easy,possible1.Itisdifficultformetofinishtheworkontime.译文：对我来说，按时完成这项工作很难。2.Itisnecessaryforstudentstofinishtheirhomework.译文：对学生来说，完成作业是必要的。解析：difficult和necessary均描述事情的客观属性句型2易错点提醒易错1：forsb.中sb.用主格（如I,he），错误错误：Itiseasyforshetosingthissong.正确：Itiseasyforhertosingthissong.易错2：形容词用错类型，误用人的品质类形容词错误：Itiskindforhimtohelpothers.（kind描述人）正确：Itiskindofhimtohelpothers.（改用of）核心句型3Itis+adj.+ofsb.+to-infinitive拓展结构：Itis+形容词+ofsb.+todosth.核心解析：ofsb.用来评价“人的品格、行为”功能：表达“某人做某事，真是……（品格）”形容词特点：描述人的主观品质（善良、礼貌、愚蠢等）sb.同样用宾格形式，可转换为sb.is+形容词句型3常用形容词+例句精讲常用形容词：nice,kind,good,polite,silly,helpful1.Itiskindofyoutohelptheoldmancrosstheroad.译文：你帮助老人过马路，真是太善良了。转换：Youarekindtohelptheoldmancrosstheroad.2.Itissillyofhimtomakesuchamistake.译文：他犯这样的错误，真是太愚蠢了。句型3易错点提醒易错1：ofsb.与forsb.混淆，误用介词错误：Itispoliteforhertogreetteachers.（polite描述人）正确：Itispoliteofhertogreetteachers.易错2：无法转换为sb.is+形容词，说明用错介词判断方法：能转换则用of，不能则用for重点辨析forsb.vsofsb.核心区别：形容词描述的对象不同forsb.：形容词描述“事情”，客观属性（难、重要）ofsb.：形容词描述“人”，主观品质（善良、礼貌）判断技巧1：看形容词能否用来形容人判断技巧2：能否转换为“sb.is+形容词”,能转换用of，不能转换用for辨析对比例句（直观区分）1.ItisimportantforTomtostudyhard.（for）解析：important描述“努力学习”这件事，不能说Tomisimportant2.ItisgoodofTomtostudyhard.（of）解析：good描述Tom的品质，可转换为Tomisgood3.Itiseasyforhertodance.（for）4.Itiscleverofhertodancewell.（of）小练手1判断介词（for/of）1.Itisnecessary______ustokeephealthy.2.Itiskind______youtolendmeyourbook.3.Itisdifficult______mybrothertosolvetheproblem.4.Itispolite______themtosay"thankyou".5.Itiswonderful______metowatchthefilm.forofforoffor小练手2句型转换将下列句子改为It作形式主语的句型1.ToreadEnglisheverymorningisuseful.2.Tohelpothersismeaningful.3.Tofinishthetaskinanhourisdifficult.4.Tovisitthemuseumisinteresting.提示：牢记基础结构Itis+adj.+todosth.ItisusefultoreadEnglisheverymorning.Itismeaningfultohelpothers.Itisdifficulttofinishthetaskinanhour.Itisinterestingtovisitthemuseum.专项练习1用所给词完成句子结合句型，用所给形容词和动词完成句子1.(important)Itis____________protecttheenvironment.2.(kind,me)Itis__________________helpthehomeless.3.(difficult,him)Itis________________________fixthebike.4.(necessary,students)Itis__________________listencarefully.5.(silly,her)Itis_________________________forgetherkeys.importanttokindofmedifficultforhimtonecessaryforstudentssillyofherto专项练习2单项选择结合语法规则，选出最佳答案1.Itisverygood______youtohelpmewithmyhomework.A.forB.ofC.toD.with2.Itisdifficult______ustolearnanewlanguagequickly.A.forB.ofC.inD.on3.Itispolite______himtogreethisneighborseveryday.A.forB.ofC.atD.withBAB专项练习3单项选择4.Itisnecessary______thegovernmenttobuildmoreparks.A.ofB.forC.toD.about5.Itissilly______youtobelievesuchalie.A.forB.ofC.withD.in6.Itiswonderful______metospendweekendswithmyfamily.A.ofB.forC.toD.withBBB专项练习4句型改写（合并句子）用指定句型合并下列句子，保持句意不变1.Hehelpedthedisabledboy.Itiskind.2.Weprotectwildanimals.Itisimportant.3.Shedonatedherbookstothepoor.Itishelpful.4.Thestudentslearnnewskills.Itiseasy.提示：注意介词和句式的正确搭配Itiskindofhimtohelpthedisabledboy.Itisimportantforustoprotectwildanimals.Itishelpfulofhertodonateherbookstothepoor.Itiseasyforthestudentstolearnnewskills.专项练习5句型改写（同义句转换）1.Tolearncomputerskillsisuseful.2.Youarepolitetowaitforothers.3.Forher,itiseasytofinishthehomework.4.Heissillytorefusethehelp.5.Itismeaningfulthatwehelppeopleinneed.（改为todo形式）

Itisusefultolearncomputerskills.Itispoliteofyoutowaitforothers.Itiseasyforhertofinishthehomework.Itissillyofhimtorefusethehelp.Itismeaningfulforustohelppeopleinneed.专项练习6｜短文填空从括号中选择正确的短语，完成短文Ithinkit's(1)______(A.necessaryforus/B.necessaryofus)tohelpeachother.It's(2)______(A.kindofmyfriend/B.kindformyfriend)tohelpmewhenI'mintrouble.It's(3)______(A.difficultforme/B.difficultofme)tosolvethisproblemalone.Myteachersaidit's(4)______(A.goodofme/B.goodforme)tokeeptrying.It's(5)______(A.wonderfulforus/B.wonderfulofus)tohaveagoodtimetogether.AAAAA专项练习7句型纠错找出下列句子中的错误1.Itiskindforhertohelptheold.（错误：______改正：______）2.Itareimportanttostudyhard.（错误：______改正：______）3.ItiseasyforItoswim.（错误：______改正：______）4.Toplayfootballisfun.（改为更自然的句型：___________________）5.Itissillyforhimtomakemistakes.（错误：______改正：______）for

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of语法误区总结1误区1：混淆for和of的用法，忽略形容词的描述对象牢记：描述