现在完成时讲解和练习

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1、现在完成时1．定义：现在完成时（Presentperfect）过去发生并且已经完成的动作对现在造成影响或后果，过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态。2．关键词:常与时间副词already（已经），yet（还、已经），just(刚刚、仅仅)，ever（曾经），never（从不），before（以前）等连用。这几个副词的用法如下:3.havebeento…(去过…)与havegoneto…(去了…)4.延续动词和瞬间动词的转换：have=buy;keep=borrow,lend;beaway=leave;bedead=die;beopen=open;beclo

2、sed=closebeon=start5.for+段时间，since+2.点时间/段时间+ago/从句（过去时）Eg.forthreeyears,since1998,sincethreeyearsago,sinceshewastenyearsold.否定句一般疑问句肯定回答/否定回答3.句型Ihavebeenateacherfor6years.BeShehasbeenadoctorsinceshewas20yearsold.动Wehavebeengoodfriendssince10yearsago.词Ihavealreadylookaftermysisterforthreedays

3、.实Shehasalreadycomeouthisnovel.义Theplanehasjusttakenoff.动Wehaven’tturnedonourcomputeryet.词Theyhaveeversetupaschoolforpoorchildren.IhavegonetoBeijing.(我去北京了)IhavebeentoBeijing.（我去过北京）3.用动词适当形式填空lookafter1.I___________already________________________thepetdogforLinglingfor3days.2.Linda___________

4、___________________________(not)herparentsbefore.3.Thelittleboy______________________________________(not)himselfyet.4.______youever______________________acat?5.who__________DamingandLingling_________________since2000?6.Wangli_________already_______________________homelessdogsinceshe________(b

5、e)sixyearsold.setup1.MissLiu___________already_______________________anEnglishschool.1.I______________________________________acomputercompanyfor5years.2.You__________________________________(not)afactorybecauseofthepollution.3.we__________ever____________________________aHopeSchoolforpoorchil

6、dreninavillage.4.Thetwofactories______________________________________businessrelationssince1980.5.________you_______________________anorganizationtohelppoorpeopleseedoctoryet?comeout1.we______________________________________schoolmagazinefor10years.2.Thisbook__________________________________

7、___________fortenyears.3.____________he______________hisnewnovelyet?4.What____________they_____________________inthepast10years?5.____________you__________________________bookssinceyouwere10yearsold?6.She________________________________