牛津英语9A_Unit_5__Grammar

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1、Unit5GrammarPastperfecttense1.Theyarrivedatthestationattenyesterday.一般过去时表示在过去时间里发生的动作或存在的状态。强调过去某一特定的时间。2.Ihavelearned1000Englishwordssofar.现在完成时表示的动作发生在过去，但侧重对现在产生的结果或造成的影响，与现在有关。其结构为：“助动词have（has）+过去分词”温故而知新Theyhadarrivedatthestationbytenyesterday.1.Theyarrive

2、datthestationattenyesterday.2.Ihavelearned1000Englishwordssofar.Ihadlearned1000Englishwordstillthen.温故而知新过去完成时表示在过去某一时间或动作之前已经发生或完成了的动作，即“过去的过去（past-in-the-past）”。----

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5、------------>一、过去完成时的概念与结构特点那时以前那时现在Ihavelearned…Englishsongssi

6、ncewecametothisschool.Ihadlearned…Englishsongsbeforewecametothisschool.构成：主语+had+动词的过去分词(p.p.)写出下列动词的过去完成时形式(5’/1)be_________________see_________________begin_______________sing_________________bring________________open________________hadbeenhadseenhadbegunhadsun

7、ghadbroughthadopened主语+had+动词的过去分词(p.p.)定义：过去完成时：强调过去某一个动作发生在另一个动作前常常用过去完成时态。1.在老师进入教室前,李磊擦了黑板.LiLei______________(clean)theblackboardbeforetheteachercameintotheclassroom.hadcleaned2.当我们到那儿时火车已经离开了。Thetrain__________(leave)whenwearrivedthere.hadleftWeuseittotalka

8、boutanactionthathappenedbeforeanotheractioninthepast.构成：1.cleanedtheblackboard2.closedthewindow——————∣—————∣—————→∣——→nowhadcleanedtheblackboardclosedthewindowShehadcleanedtheblackboardbeforesheclosedthewindow.Aftershehadcleanedtheblackboard,sheclosedthewindow.dr

9、ankwaterhadrunoutofbreath1.ranoutofbreath2.drankwaterHehadrunoutofbreathbeforehedrankwater.Afterhehadrunoutofbreath,hedrankwater.——————∣—————∣—————→∣——→now1.ateanapple2.slept——————∣—————∣—————→∣——→nowhadeatenanapplesleptShehadeatenanapplebeforesheslept.Aftersheha

10、deatenanapple,sheslept.2.playedpingpong1.didhishomework——————∣—————∣—————→∣——→nowplayedpingponghaddonehishomeworkHehaddonehishomeworkbeforeheplayedpingpong.Afterhehaddonehishomework,heplayedPingpong.LastSaturday…LiuXingbrokethewindow.Theytriedtorunaway.Whathappen

11、edfirst?a.b.AfterLiuXinghadbrokenthewindow,theytriedtorunaway.Theytriedtorunaway.Whathappenedfirst?LiuMeifoundthem.a.b.LiuMeihadfoundthemwhentheytriedtorunaway