Unit1PastandpresentGrammar课件译林版八年级英语下册-1

Unit1PastandpresentGrammarPresentationReadtheconversationbelowandlistthesentencesinthepresentperfecttense.主语+have/has助动词+done(过去分词)+其他Presentperfecttense现在完成时的基本构成：I/We/You/They+have+done(过去分词）+其它。He/She/It+has+done(过去分词）+其它。e.g.They______________theirhomework.(finish）He______________hishomework.（finish)havefinishedhasfinishedWorkoutrules现在完成时的一般疑问句Haveyouarrived？Hasshearrived？Have/Has主语HaveTomandJanearrived？肯定句的主语和have/has调换位置变一般疑问句过去分词Yes,Ihave./No,Ihaven’t.Yes,shehas./No,shehasn’t.Yes,theyhave./No,theyhave’t.PresentationThesentencesinthepresentperfecttenseareasfollows:1.I’vejustfoundoutmanythingsaboutShenzhenfrommyuncle.2.He’s

livedtheresincehefinishedcollege.3.Transporthasalsoimprovedalot.4.HaveyoueverbeentoShenzhenbefore?5.No,I’venevervisitedShenzhen.have/has+thepastparticiplePresentationChoosetherightwordsfromthebracketsbasedontheconceptofthepresentperfecttense.presentthepresent现在完成时过去持续到现在的动作或状态过去的行为对现在产生影响动作已经发生0-多次结构:标志词:主语+have/hasdone+其它already,ever,just,never,recently,yet,beforesince,for,inthepastyears,over/duringtheyears,inrecentyears,sofarWorkoutrulesWhentouse?Sentences现在完成时与for和since的用法Ihavebeenherefor

10days.Ihavebeenheresince

10daysago.IhavebeenheresinceIwasborn.for+一段时间since+时间点（年月周日时）IhavebeenheresinceJanuary10th.since+时间段+agosince+一般过去时从句PresentationAccordingtothepart“workouttherule”,whichactiondothefivesentencesbelongto?①___________②___________③___________

21,3,45PresentationGothrough“Grammarcheck”onpage157.Sentences现在完成时的肯定句、否定句与一般疑问句肯定句否定句一般疑问句肯定回答否定回答sbhave/hasdone(sth).sbhave/hasnotdone(sth).Have/Hassbarrived?Yes,sbhave/has.No,sbhaven’t/hasn’t.I

haveWehaveYouhaveTheyhaveHe/She/Ithas

havenothasnot=I’ve=We’ve=You’ve=They’ve=He’s/She’s/It’s=haven’t=hasn’t主语助动词否定词例句I/You/We/TheyhavenotarrivedinShenzhen.He/She/Ithasnothave/has+not+donePresentationWorkouttherules.Wemakepositivestatementsusingthepresentperfecttenselikethis:主语助动词例句I/You/We/TheyhavearrivedinShenzhen.He/She/Ithashave/has+doneWemakenegativestatementsusingthepresentperfecttenselikethis:Yes,subject+have/has.No,subject+haven’t/hasn’t.PresentationWorkouttherules.助动词主语例句HaveI/you/we/theyarrivedinShenzhen?Hashe/she/itHave/Has+subject+done...?肯定回答开头主语助动词Yes,I/you/we/theyhave.he/she/ithas.否定回答开头主语助动词No,I/you/we/theyhaven’t.he/she/ithasn’t.PresentationWorkouttherules.Presentperfecttense现在完成时_________+______have/hasdoneRulesofformingthepastparticiplesofregularverbsMostverbs（大多数动词）finish→finishedVerbsendingin-e（以-e结尾的动词）change→changedVerbsendinginaconsonant+y（以辅音字母+y结尾的动词）carry→carriedShortverbsendinginavowel+aconsonant（以元音+辅音结尾的重读闭音节动词）stop→stopped+ed+d-y+ieddoubletheconsonant+ed（双写辅音字母+ed）RulesofformingthepastparticiplesofirregularverbsPresentationWorkouttherules.come→come；hurt→hurthold→held；win→wonlend→lent；build→builtcatch→caught；keep→kept；tell→told

forget→forgotten；be→been；have→had；fall→fallen；fly→flown；draw→drawn；see→seenNochange（无变化）Changethevowel（改变元音）Changetheconsonant（改变辅音）Changethevowel(s)andtheconsonant(s)（同时改变元音和辅音）Others（其他）GrammarMillie’sunclehaslivedinShenzhensincehefinishedcollege.1.Weusethepresentperfecttensetotalkaboutanactionthatstartedinthepastandcontinuestothepresent.我们用现在完成时表示从过去持续到现在的动作或状态。现在完成时的用法hefinishedcollegepresentlivesinShenzhen现在完成时常与since,for引导的时间状语连用。Whendoweusethepresentperfecttense?Grammar变化动词原形过去式过去分词comecame

comesingsangsungeatateeatengivegavegivenstealstolestolendogodidwentdonegone在原形后加en在过去式上加n原形、过去式和过去分词的词形差异较大原形中的元音字母有变化与原形相同2.动词的过去式与过去分词的变化形式不同在原形后加nGrammar•••••••••••••••Milliehas

foundoutmanythingsaboutShenzhenfromheruncle.ShefoundoutmanythingsaboutShenzhen.2.Weusethepresentperfecttensetotalkaboutanactionthathappenedinthepastandhasaconnectionwiththepresent.我们用现在完成时表示在以前某个时间已经发生的行为或曾经做过的事情对目前有某种影响。presentSheknowsmanythingsaboutShenzhen.pastGrammarpastMilliehasnevervisitedShenzhen.nevervisitedShenzhen3.Wealsousethepresentperfecttensetotalkabouthowmanytimesanactionhashappeneduptothepresent.我们用现在完成时表示某个动作从过去到现在发生的次数。

present现在完成时常与already,yet,ever,never,just,recently等副词连用。Read

and

complete.ACompletehernoteswiththecorrectformsoftheverbsinbrackets.haschangedhasturnedhasimprovedhavemovedbuilthaven’tvisitedPresentationMillieiswritingnotesaboutthechangesinSunshineTown.TherearemanychangesinSunshineTown...

SimplepasttensePresentperfecttense构成时间状语语义侧重点didhave/has+doneyesterday,in1980,lastweek,…ago,justnow,theotherday等for,since,ever,never,just,yet,recently,before,次数,inthepastyears,overtheyears,sofar等表示过去某时发生的动作或存在的状态。“重在过去”持续到现在的动作或状态；强调过去事情对现在的影响;到目前为止动作发生的次数。

“旨在当前”Q:What’sthedifferencebetweenpresentperfecttenseandsimplepasttense?Read

and

think.Presentation

一、用括号中所给单词的适当形式填空1.

—Howmanytimes__have__you__been__(be)totheGreatWall?—Onlyonce.2.

—When__did__you__visit_(visit)it?—Lastyear.3.

—Where’sSimon?—He___has_gone___(go)