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1、非谓语动词不定式作非谓语不定式由fbdo”构成，其否定式hottodo”o不定式可带宾语或状语构成不定式短语，没有人称和数的变化，但有语态的变化，不定式可作主，宾，定，状，补，表，不能单独作谓语。一.不定式的用法1作主语Toseeistobelieve・Itisrighttogiveupsmoking.2作表语MyjobistoteachEnglish・3作宾语Hewantedtogo.Ifindithardtoworkwithhim.常见用不定式作宾语的动词：want,wish,like,decide,help,a
2、sk,agree,afford,arrange,care,determine,fail,guarantee,hesitate,hope,hurry,manage,offer,pretend,promise,seek,prepare,refuse,swear,expect,plan,wouldlike,makeuponesmind,bedetermined4作补语Heaskedmetoopenthedoor.常见用不定式作宾补的动词：advise,allow,permit,forbid,ask,beg,caue,enc
3、ourage,expect,force,get,invite,like,order,peruade,prefer,require,teach,tell,want,warn,wish,considerpractice:*在感官动词feel,hear,listento,see,look,notice,watch,observe,overhear（偷听）和使役动词make,let,have等后的补语中，不定式不带to,但这些句子变成被动结构时，就必须带toIoftenhearhimsingthesong.Heisoften
4、heardtosingthesong・5作定语Heislookingforaroomtolivein.There'snothingtoworryabout.但不定式所修饰的名词如果是time,place或way,不定式后面的介词习惯上要省去。Wehadnomoneyandnoplacetolive・6作状语Icameheretoseeyou.（表目的）inorderto/soastoWewereexcitedtohearthenews・（表原因）HehurriedtotheschooI（only）tofindnobo
5、dythere•（表纟吉果7疑问词4■不定式，在句中起名词作用，可作主，宾，表Hedidn,tknowwhattosay.Howtosolvetheproblemisveryimportant.Myquestioniswhentostart・8作插入语Totellthetruth,Idon'tagreewithyou.tobesuretobefranktosumuptobegin/startwith二不定式的时态，语态1一般式：表不的动作与谓语动作同时或在之HepretendednottoknowmewhenImet
6、himinthestreet.2进行式：表示动作发生时，不定式动作霍发生HepretendedtobereadingEnglishwhenIenteredtheclassroom.3完成式：表示动作发生在谓语动作戲HeissaidtohavelearnedEnglishinBritainforayear.主动被动一般式todotobedone进行式tobedoing/完成式tohavedonetohavebeendoneTheflowersneedtobewatered・Arailwayissaidtobebeing
7、builtnow.Noharmseemstohavebeendone.四不定式的省略为避免重复可用to来代替前面的不定式，常出现在下列动词后expect,hope,wish,mean,prefer,care,forget,want,try或岀现在beglad,behappy,wouldlike/love后eg:IhaventbeentoHongKong,butIwishto.Wouldyoucometothepartytlloveto,but•…如果在省略不定式中含有be,have,havebeen等系动词或助动词，
8、要保留。eg:―Areyouonholiday?-・No,butIdliketobe.・・・Ididnttellhimthenews・―Oh,yououghttohave・动名词动名词勒词+ing构成，具有动词和名词性质，其否定式在前由联，在句中起名词的作用，可作主，宾，表，定语。一动名词的作用1作主语Seeingisbelieving.Cho
