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1、ReviewoftheGrammar(Unit1--Unit3)By:WuQingyunPresentPerfectTenseHowlonghaveyoustudiedatthisschool?Ihavetaughtatthisschoolsince2012.Presentperfecttensehave/has+动词的过去分词不规则变化现在完成时态规则变化rainlovestopstudyreadcomeseeleavebuygoberainedrainedlovedlovedstoppedstoppedstudied
2、studiedreadreadcamecomesawseenboughtboughtwentgoneleftleftwas/werebeen规则变化（-ed）不规则变化Writedownpasttenseandpastparticipleofthefollowingverbs.eat(ate,eaten)swim(swam,swum)sing(sang,sung)5GuessingGames（oneacts,onesays)drink(drank,drunk)run(ran,run)hear(heard,heard)Gu
3、essingGames（oneacts,onesays)Whendoweusethepresentperfecttense1.Hehasalreadyleft.Heisnotherenow.2.Shehasn’thadbreakfastyet.Sheishungrynow.用法一：alreadyyetjustevernever…现在完成时态的标志性词5表示过去发生的动作对现在造成的影响或结果。1.Ihave_______seenhimbefore,soIhavenoideaabouthim.2.Jackhas______
4、__finishedhishomework.3.Theboyhaschangedalot___________.4.“Haveyou________seenthefilm?”“No,Ihave________seenit.”5.“Hasthebusleft_______?”neveralready/justeverneveryetrecently5用never,ever,already,just,yet,recently填空Let’sreadthem!IhavejustseenLucy.Shehasalreadywrit
5、ten3books.Ihaven’tseenthemovieyet.HaveyoueverbeentoNanning？Haveyouseenthemovieyet?肯定句中,助动词之后疑问句末一般疑问句中5否定句末现在完成时的标志词用法：1.already（已经）/just（刚刚）：用于肯定句中2.yet（还）:用于否定句和疑问句末.3.ever（曾经）：用于一般疑问句中。4.never（从不）:表示否定5.before,recently：放在句末常与for,since引导的时间短语或从句连用.Youhavestudie
6、dEnglishfor5years.HehaslivedinLingshansincehewasborn.用法二：表示过去开始的动作一直持续到现在或还有可能继续下去。1)Wehavelivedhere______2001.2)Shehasbeenateacher___tenyears.3)Theyhavestayedabroad____morethanfiveyears.4)Ihavebeenatthisschool______Icamehere5)Shehaskeptthebook_______2014.6)Ihask
7、eptthebook____5years.sinceforforsincesinceforFillinthesentenceswithfororsince.for+时间段，since+过去时间，since+过去时态句子当句子的时间状语含有howlong,since和for时，谓语动词必须用延续性动词。Ihaveboughtthebookforaweek.Ihavehadthebookforaweek.非延续性动词又叫短暂性动词----不能和一段时间连用延续性动词----可以和一段时间连用Theyhavecomeheref
8、ortwodays.Theyhavebeenherefortwodays.×be是延续性动词come是短暂性动词×√buy是短暂性动词Judgethefollowingsentences()or()√×√have是延续性动词buy是短暂性动词5.短暂动词和延续动词转换短暂性动词对应延续性动词buyborrowcome
