第三課時SectionA(GrammarFocus～4c)單元語法精講精練1．現在完成時表示從過去某一時刻延續到現在的動作或狀態，常與for，since引導的時間狀語連用。for＋一段時間，since＋過去時間點或從句(從句的謂語動詞用過去式)。eg：Ihavelivedherefortwentyyears.我住在這里已有20年了。Wehavebuiltmanyfactoriessince1985.自1985年以來，我們建了許多工廠。HehasalwayshelpedmewithmyEnglishsincehecamehere.自從他到這里以后，他總是幫助我學習英語。2．有的動詞所表示的動作不是瞬間就可以完成的，要持續一段時間，這樣的動詞叫延續性動詞。不能延續下去的動詞，叫非延續性動詞或瞬間動詞。如：buy，borrow等，這些動詞在完成時中可改為相應的表示延續性的詞或短語來與表示一段時間的狀語連用。如：buy→have，borrow→keep，come→be，join→be，die→bedead，begin→beon等。eg：Hejoinedthearmytwoyearsago.他兩年前就參軍了。(同義句)→Hehasbeeninthearmyfortwoyears.→Hehasbeenasoldierfortwoyears.一、用since或for填空。1．Heworkedthere_____sixyears.2．IhavebeenlearningEnglish________Iwastenyearsold.3．Alisonhasbeenskating________fivehoursago.4．Mr.Smithhasbeenthere________tenyears.5．We'vebeenfriends_________weleftschool.forsincesinceforsince二、根據句意，用所給詞(組)的適當形式填空。6．We___________(notmeet)eachotherforfiveyears.Bothofus_______(leave)thefactoryfiveyearsago.7．Thehospital_________(be)therefor15years.Itis(be)thetallestbuildinginourcity.8．Thechildren______________(nevervisit)theGreatWallbefore.Theirparents___________(take)themtherenextmonth.9．They___________(neverown)anypets，butthey___________(decide)tokeepadogthisyear.10．I______________________(neverbe)tothewaterparkbefore.Iwant___________(go)thereandhavefun.haven'tmethasbeenlefthavenevervisitedwilltakeneverownhavedecidedhaveneverbeentogo三、單項選擇。11．I________myhometownforalongtime.Ireallymissit.(2014，黔西南州)A．leftB．wentawayfromC．haveleftD．havebeenawayfrom12．He

inthisfactoryfor20yearsalready.(2014，北京)A．willworkB．worksC．hasworkedD．isworking13．—DoyouknowDiaoyuIsland?—Sure.It

Chinasinceancienttimes.A．belongstoB．belongedtoC．hasbelongedtoD．isbelongingtoD

CC14．She

fortenyearsandnowshehasalovelydaughter.A．marriedB．hasbeenmarriedC．gotmarriedD．hasgotmarried15．—Lookatthesestamps.I

themforfiveyears.—Wow，theyarewonderful.A．keptB．havekeptC．haveboughtD．willkeepBB四、同義句轉換。16．WejoinedtheLeaguein2003.We______________theLeaguesince2003.17．Themeetinghasbeenonforhalfanhour.Themeeting___________halfanhour__________．18．Weborrowedthebikesfromourfriendstwodaysago.We___________ourfriends'bikes______twodays.19．Jacklefthishometownin2002.Jack________________hishometown_________2002.20．IboughttheiPadaw