新外研版八年级下册ppt课件.ppt

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1、八年级下册4SeeingthedoctorModuleUnit3Languageinuse.TosummariseandconsolidatetheuseofthepresentperfecttensetogetherwithsinceandforTobeabletounderstandlearningmaterialsonhealthTobeabletocarryoutasurveyonhealthylivingwiththehelpofothersTeachingaimsIhaven’tdonemuchexercisesinceIgotmycomputerlastye

2、ar.Ihavehadhimforthreemonthsnow.Sincethen,ithasbecomepartofmylife.Languagepractice现在完成时（三）当表示动作已经充成并对现在有一定影响时，我们一般用现在充成时。同时，可分别用just,already或yet加以强调或说明。其结构也是：have/has+动词的过去分词.常用的时间状语有:already,just,一般置于have/has之后，用于肯定句中；在否定句中则要用yet表示“还，未”。Grammarfor和since在现在完成时中的应用for与since都能与现在完成时连用，但区别较大

3、：（1）for后须接“时间段”HehasstudiedEnglishforfiveyears.他学英语5年了。（2）since后须接“时间点”HehasstudiedEnglishsince1999.他从1999年开始学英语。（3）二者可以转换for+一段时间=since+一段时间+agoHehasbeenhereforfiveweeks.=Hehasbeenheresincefiveweeksago.他到这儿已经有五个星期了。如：HehastaughtheresincehecametoChina.自从他来到中国就在这儿教书。Wehavebeenfriendssincew

4、emetinschool.我们从在学校见面起就成为了好朋友。(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。（5）现在完成时常用句型：①Itis(hasbeen)+时间段+since+时间状语或从句ItisfourdayssincelastFriday.从上周五到现在已经四天了。IthasbeentwoyearssinceJimcametoBeijing.吉姆来北京已经两年了。②Thisisthefirst(second…)timethat+从句句型中的that从句通常使用现在完成时。如：Thisisthefirsttimetha

5、tJennyandDannyhavebeentoChina.这是珍妮和丹妮第一次来屮国。ThisisthethirdtimethatIhaveseenKaren.这是我第三次见到Karen。（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。如:Ihaveboughtthiscomputersincefouryearsago.(×)Ihavehadthiscomputersincefouryearsago.(√)Ihaven’tboughtanythingfortwomonths.(√)Ihaven'theardfromhimfor3weeks.(√)实义动词分

6、为:1)瞬间动词2)延续动词瞬间动词joinbegin/startborrowfinish/endarrive/comeleavediebuy瞬间动词持续动作状态diebeoverleaveborrow/buyarrivebeginend/finishjoinmarrykept/hadbeawaybein…beon(上演）bemarriedbeinbedead含有for、since的现在完成时，要是有瞬间动词，要把它变成持续动作状态非延续性动词和延续性动词的转换leave—beawayborrow—keepbuy—havebegin/start—beondie—bedea

7、dfinish---beoveropensth—keepsthopenfallill—beillgetup—beup,comehere—behere,join—beon+组织机构/beamemberof+组织机构,gothere—bethere,become—be,comeback—beback,fallasleep—beasleep,getto/arrive/reach—be(in),leave—beawayfrom,gettoknow—know,go(get)out—tieout，puton—wear,catchacold