动词不定式的用法不定式在句子中可做主语、宾语、表语、定语、状语和宾语补语。1)不定式做主语一般表示具体的某次动作。【例如】Tocompletethe30storiedbuildinginoneyearwasquiteadifficulttask.Todothatimpliestakingresponsibility.当主语较长，谓语较短时，常用it做形式主语，而将不定式放到谓语的后面。【例如】Itisimportantformodernyoungpeopletomasteratleasttwoforeignlanguages.It做形式主语，不定式放在谓语动词之后常用于下列结构中：a)Itis＋形容词(easy,important,difficult,foolish,inconvenient,unnecessary,right,wrong...)＋(for/ofsb.)＋不定式【例如】ItisessentialtoreserveatableinadvanceofChristmasEve.Itishardtoputmyhopessintoswords.Itisnoteasytocatchfishwithyourhandsonly.ItisimportantforusyoungpeopletolearnEnglishandmasterit.b)Itis＋名词(apleasure,apity,apleasantthing,one"sduty,anhonor,ashame,acrime,noeasyjob...)＋不定式Itisasheerwasteoftimetoreadthatkindoftrash.Itisapitytohavetogowithouther.Itisagloriousdeathtodieforthepeople.c)Ittakes(sb.)sometime(hours,months,days,alotoftime,patience...)＋不定式IttakesmethreehourstolearnEnglisheachday.Ittookthemhalfthenighttogethomeinthesnow.2)不定式作表语不定式作表语常表示将来的动作，主语常常是表示意向、打算、计划的词，如wish,idea,task,purpose,duty,job等。【例如】Themostimportantthingforone"shealthistohaveplentyofexercise.Mychiefpurposehasbeentopointoutthedifficultiesofthematter.Thepurposeoftheorganizationistogreetallnewcomerstothecityandtoprovidethemwithanynecessaryinformation.WhatIwantedwastogettheworkdoneasquicklyaspossible.3)不定式作宾语不定式常在下列动词后面作宾语：afford,agree,apply,arrange,ask,attempt,beg,begin,care,choose,claim,consent,demand,decide,desire,determine,expect,fail,hope,hesitate,hate,intend,learn,like,manage,mean,neglect,offer,plan,preparepretend,promise,refuse,resolve,seek,tend,threaten,want等。【例如】Iliketogooutforwalksinthewarmsunshineinspring.Mymotherhatestomovefromplacetoplace,forshefeelstired.Idecidetoworkhardandgetdoctor"sdegree.Theroomisdesignedtobemystudy,butnowithastobeusedasabedroomforthechildren.Shefailedtofinishtheassignmentintime,andshewasworriedaboutit.ThereisamanatthereceptiondeskwhoseemsveryangryandIthinkhemeans()trouble.(CET-41997,1)A)makingB)tomakeC)tohavemadeD)shavingsmademean后面一般加不定式，所以A和D可以排除。根据句意，他看起来非常生气，他想找麻烦，不定式的动作还没有实施，应用一般式，因此答案为B。不定式作宾语还常用在下面结构中；主语＋动词＋it＋形容词＋不定式。【例如】Wefounditimpossibletogeteverythingreadyintime.IthinkitimportanttolearnEnglishwellincollege.使用这种句型的常见动词有：believe,consider,declare,feel,find,guess,imagine,prove,realize,suppose,think,等。4)“whword＋不定式”结构不定式前加一个疑问代词(what,which,who,whom,whose)或疑问副词(where,when,how,why)，以及连词whether构成特殊的不定式短语，其作用相当于一个从句，这样的不定式短语常在某些动词后面作宾语。常见的可以接这种不定式短语的动词有：know,see,decide,tell,ask,consider,discover,explain,findout,forget,guess,hear,imagine,inquire,learn,observe,perceive,remember,think,understand,wonder等。【例如】Icouldn"tdecidewhichbooktochoose.Icantellyouswherestogetthisbook.TheyfoundithardtodecidewhethertogoswimmingnextSundayortovisitAuntSallyinNewYear.“whword+不定式”结构除了作宾语外，还可以在句中作主语或者表语。【例如】Whentostarttheprogramremainsundecided.Thequestionishowtoputtheplansintospractice.5)不定式作状语a)不定式作状语表示目的。或用于soas和inorder之...
