1.性质:它具有动词的特点,但在句子中起着名词、形容词、副词的作用,充当主语、表语、定语、宾语、宾语补足语、状语的作用即:做除谓语以外一切成分。在动词-ing前加notThankyoufornotsmoking.Hisnotcomingmadeeveryoneverydisappointed.动词-ing形式的否定形式:动词的ing形式作主语,表语和宾语什么是主语(subject)?什么是宾语(object)?Helikeshisdog.主语宾语Swimmingismyinterest.Ilikereading.主语宾语结论_________不能作主语和宾语_____________可以作主语和宾语动词原形动词的ing形式1动词-ing形式可直接置于句首作主语,谓语动词用单数。Seeingisbelieving.眼见为实。A.动词的ing形式作主语Dancingistheirhobby.dancehobbyBitingnailsisnotagoodhabit.bitenailshabitDoingexerciseisthebestwaytoloseweight.doexerciseloseweight2为了保持句子平衡,通常用先行词it作形式主语,而把真正的主语放在句末。此类句型有:总结:用it作主语,而把真正的主语移置句尾。Itisnouse/uselessdoingsthItisnogooddoingsth.做....是没有好处的ItisworthwhiledoingsthItispleasantdoingsthItisawasteoftimedoingsth做……是没有用的。做……是值得的。做……是有乐趣的。做……是浪费时间的形式动词ing形式Itisnouse\uselessdoingsth做……是没有用处的。Itisnouse.tryingtoescapeItis/wasworthwhiledoingsth做……是值得的。Itisworthwhile.seeingthefilmItis/wasawasteoftimedoingsth做……是浪费时间的。Itisawasteoftime.playingcomputergamesItis/waspleasantdoingsth做……是有乐趣。Itispleasant.playingwithfriendsItisnousetryingtoescape.Itisworthwhileseeingthemovie.Itisawasteoftimeplayingcomputergames.Itispleasantplayingwithfriends.1表示主语的内容。此时,主语表语位置可互换Herjobiskeepingthebaby.=Keepingthebabyishisjob.2表示主语具有的特征Theproblemisquitepuzzling.B.动词的ing形式作表语1.作介词的宾语。2.作及物动词的宾语。C.动词的ing形式作宾语结论:凡是介词后面加动词时,一律用动词的ing形式。我们把这种情况称作动词的ing形式作介词的宾语。常用的短语有:befondof喜欢;betiredof厌倦;giveup放弃;beinterestedin对…感兴趣;lookforwardto盼望;leadto导致;payattentionto注意;beusedto习惯于注意:凡是固定短语里面带的to都是介词,而不是不定式,所以它后面的动词要用ing形式。dreamofJiaLaolianalwaysdreamsof_________themouse.catchingcatchJiaLaolianenjoys________watermeloninsummer.eating结论:有些动词后只能跟动词的ing形式,我们把这种情况称作动词的ing形式作及物动词的宾语。只能跟动词的ing形式作宾语的常用动词及词组有:admit承认,avoid避免,consider考虑,dislike不喜欢,enjoy喜欢,escape逃跑,finish完成,keep继续,mind介意,suggest建议,imagine设想,practise练习,giveup放弃,can'thelp禁不住,feellike想要做×Correctornot?Wouldyoumindopeningthewindow?Wouldyoumindopenthewindow?Payattention:mind后必须接动词的ing形式×Correctornot?Heisusedtolivinginthecountryside.Heisusedtoliveinthecountryside.Payattention:beusedto是一个固定短语,里面的to是介词,而不是不定式,所以它后面的动词要用ing形式。×Correctornot?Ican'thelplaughing.Ican'thelptolaugh.Payattention:词组can'thelp后必须接动词的ing形式×Correctornot?Welookforwardtoseeingyou.Welookforwardtoseeyou.Payattention:介词to后面的动词要用ing形式D.动词的ing形式的复合结构主要有两种:1.形容词性物主代词/名词所有格+V-ing形式,如:IinsistonMary’sgoingthere.我坚持要玛丽到那儿去。Hisbeinglateforclassmadehisteacherveryangry.2.在口语和非正式语体中,且做宾语时,常用人称代词宾格或名词普通格+V-ing形式例如:Idon'tmindMarybeinglate.Thedoctordoesnotmindme/myeatingalittlemeatoccasionally.医生并不反对我偶尔吃一点肉。用法当v-ing形式作主语/宾语/表语,且它的逻辑主语不是句子的主语时,就需要使用v-ing形式的复合结构。如:Doyoumindwaitinghere?你介意在这儿等会儿吗?wait的逻辑主语就是句子主语you,所以直接用v-ing形式。再如:Doyoumindmy/mesmokinghere?你介意我在这儿抽烟吗?smoke的逻辑主语是my\me,而不是句子主语you,所以必须使用v-ing的复合结构。翻译练习1.学习英语非常有趣。LearningEnglishisveryinteresting.2.环游世界是她的梦想。Travellingaroundtheworldisherdream.3.在教育上花钱是值得的。Itisworthwhilespendingmoneyoneducation.4.很多孩子喜欢踢足球。Manychildrenarefondofplayingfootball.5.你读完那本书了吗?Haveyoufinishedreadingthatbook?6.她试图避免再次见到他。Shetriedtoavoidmeetinghimagain.Thanks!