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英语
关于好奇心的名言警句英语高中英语词汇下载高中英语词汇 下载英语衡水体下载小学英语关于形容词和副词的题
现在完成时基本结构have(has)+been+done(动词的现在分词)否定句式have(has)+not+been+done(动词的现在分词)疑问句式have(has)放在句首用法过去发生的动作对现在有影响Ihaveseenthefilm,soIknowwhatthestorysays.过去发生的动作持续到现在(还有可能继续发生)Thefilmhasbeenonfor5minutes.延续性动词现在完成时中应使用延续性动词非延续性动词:动作开始既(即)结束非延续性动词过渡到延续性动词常见:四.标志already,yet,never,ever,just,before,once/twice/数字+timesalready,yetalready:用于肯定句,疑问句中,表示“已经”或表示强调Hehasalreadylefthere.Hashealreadylefthere.yet:用于否定句中,疑问句中,表示“还没”或“已经”Myteacherhasn’thadbreakfastyet.Haveyouwrittentoyourparentsyetnever,evernever:从来没有ever:曾经WehaveneverbeentotheGreatwall.HaveyoueverbeentoCanada?just刚才Iamjusthadbreakfast.allthetime总是,duringthelastyears在过去的几年里recently最近地=lately,bytheendof(thismonth,nextyear)inthepastfewyears/month在过去的……间uptonow直到现在for+段时间,since+点时间Ihavebeenherefor5years.Ihavebeenheresince2000.Ihavebeenheresince5yearsago.since+段时间+agoIhavebeenheresinceIgraduatedin2000.since+从句have/hasgoneto去了没回来have/hasbeento去了回来了have/hasbeenin在某地待多久for+段时间,since+点时间用howlong提问固定句型Since句型。“since+一般过去时”Since从句中用非延续性动词或终止性动词表示肯定Since从句中用延续性动词表示否定IthasonlybeenfourdayssinceyouwenttoTokyo,butitseemslikeit’sbeenfouryears.Ithas/isbeen5yearssincehebegantosmoke.2.this/it+was/is+(oneof)themost/best+形容词最高级+n.(pl.)+that+完成时ThisisthemostinterestingbookthatIhaveeverread.3.this/it+was/is+thefirst/second/其他序数词/last+time+that+现在完成时/过去完成时ThisisthefirsttimechildrenhavetakenpartinGeneralAssemblyactivitiesinsuchsizeandnumber.