英语人教版八年级下册Grammar Focus.pptx

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1、Presentperfecttense(现在完成时）ByWuMeixiaIhavevisitedthemuseumtwice.Haveyoueverbeentothemuseum?Yes,Ihave./No,Ihaven’t.构成have/has+done（动词过去分词）动词过去式过去分词的变化规则：一般动词加ed，（open-opened-opened）本身e结尾直接加d，（close-closed-closed）重读闭音节单词,双写然后加ed，（plan-planned-planned）辅音字母加y,变y为

2、i加ed，（study-studied-studied）特殊动词特殊记。(take-took-taken)presentperfecttense（现在完成时）用法一表示过去发生的某一动作对现在造成的影响或产生的结果.现在完成时这一时态强调是过去动作与现在的联系,也就是强调对现在的影响和结果.Ifedthehorsejustnow.我刚才喂马了。（马儿现在饿不饿不知道，只是描述过去发生的事情。）Pasttense(一般过去时)Ihavefedthehorse.Presentperfecttense现在完成时我已经

3、喂过马了。（马儿现在不饿了，不需要喂。）Hehadbreakfastat7:00a.m.thismorning.他今天早上七点吃的早饭。Hehashadbreakfast.他已经吃过了早饭。Pasttense(一般过去时)Presentperfecttense现在完成时Adverbialsoftime（时间状语)before（以前）bynow/sofar（到目前为止）once,twice…（一次，两次…）just（刚刚）recently/lately（最近）yet(否/疑),already(肯),ever,（曾

4、经）never（从不）,in/duringthepast/last5years,（在过去的/最近的五年（期间）Exercises1.I_______(have)lunchalready.2.Hasthetrain_______(arrive),yet?3.Tom____never_______(be)toChina.4.Thetwin______just_____(see)myfather.5.Thetwins____(see)myfatherjustnow.6.Manytallbuildings_______

5、_____(build)inthepast5years.havehadarrivedhasbeenhasseensawhavebeenbuilt用法二表示过去某个时间开始的动作或存在的状态，一直持续到现在并可能还将持续下去。动词使用延续性动词。常与for或since引导的时间连用.for+时间段since+过去的时间点since+句子（过去时）Katehaslivedherefor3years.Katehaslivedheresince3yearsago.Katehaslivedheresinceshecame

6、toChina.常见非延续性动词和延续性动词的转变arrive/come/gotodiebecomeborrowLeavebuyopenjoinstart/beginfinish/endcatchacoldgetupclosewakeupgotosleepbecomeinterestedinbeinbedeadbehavebeawayfromhavebeopenbeamemberof/inbeoverhaveacoldbeupbeawakebeclosedsleep/beasleepbeinterestedin

7、beonExercises1.Hisfatherhasdied.(for2years)2.Thefootballmatchhasbegun.(since9:00a.m)3.Theyhavejoinedthearmy.(sincetheywere18yearsold)4.MyteacherhasjustleftNanjing.(for3days)Hisfatherhasbeendeadfor2years.Thefootballmatchhasbeenonsince9:00a.m.Theyhavebeeninthe

8、armysincetheywere18yearsold.MyteacherhasjustbeenawayfromNanjingfor3days.一个重点句型:Itis/hasbeen+时间段+since从句时间段+haspassed+since从句他去世了两年了HediedtwoyearsagoHehasbeendeadfortwoyears/sincetwoyearsagoIti