英语语法课件：现在完成时

,ThePresentPerfectTense,学习目标,掌握现在完成时的构成和用法.掌握动词的过去分词的构成.,一.Form:,1.肯定句:S(主语)+have/has+PP(过去分词),2.否定句:,S(主语)+have/has+not+PP(过去分词),3.疑问句,Have/has+S(主语)+PP(过去分词)?Yes,S+have/has.No,S+have/hasnt.,说明：,助动词have和has可前面的主语缩略为ve,s.如theyve,weve,hes,its;hasnot=hasnthavenot=havent,二、过去分词的构成,1.+edwork,plant,call2.e+dlive,change,like,love,agree,savehate,move,arrive,skate,hope,use,3.以重读闭音节结尾，末尾只有一个辅音字母的双写ed.如：plan,stop,drop,fit(适合),prefer(更喜欢),travel,。以辅音字母y，结尾，变y为iedtry,study,carry,hurry,cry,worry,copy,三、特征词already(肯定句)yet(否定句和疑问句)never，ever(疑问句)just(谓语动词之前)before(句末）,inthepast/lastfewyears,(过去几年来)sofar=uptonow,tillnow,bynowthesedayssince/eversincefor+时间段,四、用法表示过去发生的某一动作对现在造成的影响或结果。Ihavealreadyseenthefilm.Jimhasjustlosthisbook.,四、2.常和表示从过去某一时刻延续到现在的一段时间的状语连用.如：for+时间段for12weeks/threeminutessince+时间点(起点)since9oclockthismorning,since一段时间agofor时间段;sincetwoweeksago=fortwoweeks;forayear=sinceayearago;since2000=for4years,since+从句(常用一般过去时)TheGreenshavelivedinBeijingsincetheymovedtoBeijingfromParis.,时态填空：-Areyousureyou_(lose)thebook?-Yes,I_(look)foriteverywhere,butIstillcantfindit.,havelost,havelooked,2.We_already_(copy)thesewords.,have,copied,3.Jim_(just,watch)afootballmatch.Heissotiredandhungry.,hasjustwatched,4._youever_(travel)onatrain?,Have,travelled,5.-_they_(see)thefilmyet?-Yes.They_(see)italready.-When_they_(see)it?-They_(see)itjustnow.-,Have,seen,haveseen,did,see,saw,6.-_hersister_(be)toNanning?-No,she_(never,be)therebefore.,Has,been,hasneverbeen,五。瞬间动词和延续性动词的转换,open-beopen;close-beclosed;begin-beon;finish,end-beover,become-be;join-beamemberofbein;die-bedead;getup-beup;,comearrivereachgetto-bein/behere;catchacold-h