现在完成时教学课件.pptx

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1、Unit14Haveyoupackedyet?现在完成时ThePresentPerfectTenseStudyingaims1.现在完成时的构成2.现在完成时的主要用法及相关的时间状语3.短暂性动词与时间段的关系4.havebeen与havegone比较5.与一般过去时的用法比较夏天还会远吗?willitstillbefarinsummer?春天已经来了,Springhasalreadycome,现在完成时态Springhasalreadycome.一)构成:have/has+动词过去分词基本结构Th

2、epresentperfecttensehave/has+done助动词（可以帮助构成肯定、疑问和否定句）1.Hehascleanedhisroom.(写一个一般疑问句）Hashecleanedhisroom?2.ShehaslivedinLondonforfouryears.(划线部分提问）HowlonghasshelivedinLondon?3.HehasbeentoChina,________?（写出反义疑问句部分）hasn’the4.Theyhavecomebackfromwork.(写否定句

3、）Theyhaven’tcomebackfromwork.(一)表示过去发生的动作或事情对现在的影响和产生的结果.它强调的是过去的动作同现在的联系.常用的时间状语有already,yet,ever,never,just,before等.现在完成时的主要用法A:______yourbrother______hishomeworkyet?(finish)B:Yes,he‘salreadydoneit.KeywordsHasfinishedyetalready注意：already用于肯定句，yet用于疑问句

4、和否定句中A:_______youever_______tothepark?(be)B:No,never.KeywordsHavebeenyetalreadyevernever注意：ever曾经用于疑问句中never从不带有否定意义I______just________thedesk,youcantakeittoyourclassroom.(mend)KeywordshavemendedyeteverneverjustalreadyJust刚刚与现在完成时连用一般置句中Justnow刚才与一般过去时连

5、用(二)表示一个从过去开始,一直持续到现在,有可能继续下去的动作或状态.通常和for或since引导的时间状语连用.Tom___________inthefactorysinceheleftschooltenyearsago.(work)Keywordshasworkedsincesince后面带过去时间或有一般过去时的句子A:Howlong______you________inthisschool?(teach)B:For6years.Keywordshavetaughtsincefor+一段时间W

6、e_______only____________100treessofar.(plant)Keywordshaveplantedsofar到目前为止Keywordsyeteverneversinceforjustbeforealreadysofarinthepast10yearstwice也可以是其他表示次数的词howlongSomeverbscan'toftenbeusedwith"for"or"since"Hehasboughtthebook.Hehasboughtthebookforaweek.

7、Hehashadthebookforaweek.buyhavecome/go/gettobeinjoinbeinbea…memberleavebeawayborrowkeepbeginbeonfinishbeoverdiebedeadreturebebackPleasepointoutanymistakesandcorrectShehasboughtthecomputerfortwoyears.hadbuyhave/hashadPleasepointoutanymistakesandcorrectHo

8、wlonghaveyoucometotheUnitedStates？beenincometohave/hasbeeninbuyhave/hashadPleasepointoutanymistakesandcorrectAnnhasgonetoChinasincethreemonthsago.beenincometohave/hasbeeninbuyhave/hashadgotohave/hasbeeninPleasepointoutanymistakes