Unit 10 Section A Grammar focus-4c-浙江省绍兴市建功中学人教新目标八年级下册英语课件 (共23张PPT).pptx

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1、英语新目标八年级下,Unit10Ivehadthisbikeforthreeyears.,SectionAGrammarfocus-4c,GrammarFocus,相互转换,表示从过去已经开始持续到现在的动作或状态，可以和表示“从过去某一时刻延续到现在的一段时间状语”连用，（）+一段时间”、“（）+过去点时间”、“since+过去时的从句”、“since+一段时间+ago”。且for与since引导的时间状语可以（）,PresentPerfectTense,现在完成时,since,for,e.g.Myunclehasworkedatthisfactoryfortenyears.=Myuncle

2、hasworkedatthisfactorysincetenyearago.Ivelivedheresince1990自从1990年以来我就住在这里。Ihaventseenhimforthreeyears.我三年没有看见他了。,含有for，since的现在完成时的用法歌诀:过去的动作或状态，一直持续到现在，for、since把时间带。,Shesbeenatthisschoolsincefiveyearsago.自从五年前她就在这个学校。,口诀,for与since都能与现在完成时连用，但区别较大：（1）for后须接“时间段”e.g.HehasstudiedEnglishforfiveyears.

3、他学英语5年了。（2）since后须接“时间点”e.g.HehasstudiedEnglishsince1999.他从1999年开始学英语。,for和since在现在完成时中的应用,（3）二者可以转换for+一段时间=since+一段时间+agoe.g.Hehasbeenhereforfiveweeks.=Hehasbeenheresincefiveweeksago.他到这儿已经有五个星期了。,e.g.HehastaughtheresincehecametoChina.自从他来到中国就在这儿教书。Wehavebeenfriendssincewemetinschool.我们从在学校见面起就成为了

4、好朋友。,（4）since能引导时间状语从句(主句用现在完成时，从句用一般过去时)，而for则不能。,（6）均须与延续性动词连用，也可以与非延续性动词的否定式连用。e.g.Ihavehadthiscomputersincefouryearsago.Ihaventboughtanythingfortwomonths.Ihaventheardfromhimfor3weeks.,非延续性动词用于完成时态，在肯定句中不能与for或since引出的短语(或句子)连用，但在否定句中是可以的，因为一个非延续性动词一旦被否定即成为状态，而状态总是可以延续的。如：Ihaventseenhimforalongti

5、me.我很久没见到他了。Hehasntcomehereforsometime.他有段时间没来了。Ihaventheardfromhersincesheleft.自她离开以后，我一直没收到她的来信。,（7）二者引出的时间状语往往用howlong提问。,e.g.Howlonghaveyouhadthisbook?Foraweek./Sinceaweekago.这本书你买多久了?买一周了。,此种用法中表示持续性的动作或状态的动词必须是延续性动词(否定句除外)。1.这本书我买了5年了。Ihaveboughtthebookforfiveyears.()Ivehadthebookforfiveyears.

6、(),句中动词的特点,2.你哥哥参军多长时间了？Howlonghasyourbrotherjoinedthearmy?()Howlonghasyourbrotherbeeninthearmy/beenasoldier?(),1.转换为相应的延续性动词，用于现在完成时。borrowbuyputoncatchacoldgettoknowgettosleep,非延续性动词和延续性动词之间的转换,keep,have,wear,haveacold,know,sleep,2.转化为“be+形容词/副词/介词/名词”begin/startbeongooutbeoutclosebeclosedopenbeop

7、engetto/arrive/reachbe(in)diebedeadleavebeaway,finishbeoverfallsleepbeasleepjoinbein/beamemberofbecomebemakefriendsbefriendscome/go/be+相应的介词短语,一、选择for或since填空：Ihavebeenhere_fivemonthsago.2.Hehasbeenasoldier_abouttwomonths.3.Greatchangeshavetakenplace_youleft.4.Hisgrandpahasbeendead_tenyears.5.Ihaves

8、tudiedEnglish_Iwas12yearsold.6.Itistwoyears_Ibecameapostgraduatestudent.,since,for,since,for,since,since,4a,Rewritethesentencesusingfororsince.,1.JimisinJapan.Hearrivedtherethreedaysago.2.Theyareveryhungry.Theirlastmealwastenhoursago.3.Ihaveacamera.Iboughtitin2009.,JimhasbeeninJapanforthreedays.,The

9、yhavenoteatenfortenhours.,Ihavehadacamerasince2009.,4.IknowAnn.Ifirstmetherthreeyearsago.5.Lindaisill.ShebecameillonMonday.,IhaveknownAnnaforthreeyears.,LindahasbeenillsinceMonday.,4b,Fillintheblankswiththecorrectformsoftheverbsinbrackets.,I_(neverbe)tothewaterparkbefore.Iwantto_(go)nextmonthbeforet

10、heweathergetstoocold.2.They_(neverown)anypets,butthey_(alwayswant)tohaveadog.,haveneverbeen,go,haveneverowned,havealwayswanted,3.We_(have)apianosincelastNovember.We_(buy)itfromtheLifamilywhentheymovedtotheUSlastyear.4.CathyandAmy_(notbe)backtotheirhometownfortwoyears.They_(miss)theirhometownalotandh

11、opetovisittheplacenextyear.,havehad,havenotbeen/haventbeen,bought,miss,5.Thismuseum_(be)hereforover20years.It_(be)oneoftheoldestbuildingsinthissmalltown.,hasbeen,is,4cFillinthequestionsandasktwostudents.Thencompletethechart.,1.Doyouhavea(n)_?Howlonghaveyouhadit?2.Doyouowna(n)_?Howlonghaveyouownedit?,Homework,ReviewtheGrammarFocusandtellthedifferencesbetweenforandsince.,Thanks！,