“betodo”的用法

“betodo”的用法一般说来，“betodo”这个结构有两种语法意义，其一是连系动词be+动词不定式做表语，其二是beto是一个独立词汇单位,具有情态含义,可以把它叫做情态习语(modalidiom)。一、be+动词不定式,不定式做表语,表示主语和表语在概念上是等同的。如：Theproblemistofindasolution.Hisplanistocleantheroom.Mywishistobeadoctor.二、beto+动词不定式中的beto用作情态习语,这时的betodo表示:“”、“安排”、“义务”、“应该”、“可能”、“命运”等。(haveto,oughtto)。如:Heistohaveaholiday.(表示将来)Thecommitteeistomeettoday.(表示计划、安排)Youaretogotothehotelwhereroomshavealreadybeenbookedforyou.1.表示“将”、“计划”、“安排”。(意思接近于begoingto)如：Theirdaughteristogetmarriedsoon.Whoistoquestionhim？Itwasthelastfilmatthecinema，whichwastoclosenextday.Afterdinnertheyweretogotoamovie.was/weretodo表示过去曾经计划要做的事，或者过去应当做的事，而且从现在的角度来看已经实现了。如：IfeltnervousbecauseIwassoontoleavehomeforthefirsttime.IwastoplayJuliet.Theexpeditionwastostartinaweek’stime.was/weretohavedone,表示“本打算”、“本计划”或“本应当”做的事而没有做成或没有发生。如:IwastohaveseenhimlastWednesday,buthedidn’tcome.Weweretohavebeenmarriedlastyear.2.表示“义务”、“应该”。(意思接近于should，must，oughtto，haveto)如：Nooneistoleavethebuilding.谁也不得离开这楼房。Youarenottosmokeinthisroom.=Youarenotsupposedtosmokeinthisroom.Youaretobebackby10o’clock.你必须十点以前回来。3.表示可能性,相当于can,may如:Suchbooksaretobefoundinthelibrary.这样的书在图书馆里就能找到。Notasinglesoundwastobeheard.一点儿声音也听不到。Notasoulwastobeseen.看不到一个人影。Shewasnowheretobefound.哪儿也找不到她。Shewasnevertoseehiswifeandfamilyagain.5.表示“命运”,将来必然要发生的事,译作“注定……”。如：Hecametopower,buthewastoplaydearlyforit:soonhewasassassinated.Theworstisstilltocome.Theysaidgoodbye,littleknowingtheywerenevertomeetagain.6.用于“if…weretodo”，表示虚拟语气。如：Ifitweretoraintomorrow,thesportsmeetingwouldbeputoff.如果明天下雨,运动会就会延期。一、时态、语态      时态、语态需要掌握的要点：1.以下几类动词一般不能用于进行时，同样不用于完成进行时：(1)表示感知的动词：hear,feel,notice,recognize,see,taste,smell；(2)表示意愿、情感的动词：desire,dislike,forgive,hate,like,love,prefer,refuse,want,wish,fear,love,hate；(3)表示思考、看法的动词：believe,doubt,expect,forget,hope,feel,mean,know,agree,realize,mind,recall,recollect,remember,trust,suppose；(4)表示所有、占有的动词：belongto,owe,own,possess,hold(容纳)；(5)其他动词：cost,appear,concern,contain,consist,deserve,matter,seem。如：I’dsaywheneveryouaregoingaftersomethingthatisbelongingtoyou,anyonewhoisdeprivingyouoftherighttohaveitiscriminal. (1997年考研题，belong表示归属，不用于进行式)Hewasseeingsomebodycreepingintothehousethroughtheopenwindowlastnight.(1990年考研题，see表示结果，不用于进行式) 2.不用will/shall表达将来时的形式：(1)begoingto表示现在的打算和意图； (2)arrive,come,drive,go,leave,retire,return,setoff,start,takeoff等表示移位的动词的进行体表示按计划肯定要发生的将来动作； (3)beto(do)表示安排、计划、决定、命令或注定要发生的事，如：Greatereffortstoincreaseagriculturalproductionmustbemadeiffoodshortageistobeavoided.(4)beaboutto(do)表示将要(做)，如：Marlinisayoungmanofindependentthinkingwhoisnotabouttopaycomplimentstohispoliticalleaders.(5)beonthepoint/vergeof(doing)表示“马上就要”，一般不与表示将来的时间状语连用； (6)be,begin,come,depart,getoff,go,leave,return,start的一般现在时表示按日历或时刻表要发生的将来动作或事件，如：Ifyouwantyourfilmtobeproperlyprocessed,you’llhavetowaitandpickituponFriday,whichisthedayaftertomorrow.(画线部分一般不用willbe) (7)在时间、条件、让步从句中，一般现在时代替将来时，但要注意区别从句的类型，如：Idon’tknowwherehewillgotomorrow.我不知道他明天去哪儿。(宾语从句)I’lltellhimwhenyouwillringagain.我告诉他你什么时候再来电话。(宾语从句)比较：I’lltellhimwhenyouringagain.你再打电话时我告诉他。(状语从句)(8)在makesure,makecertain,see(toit)后的that从句中，谓语动词用一般现在时代替将来时，如：Seetoitthatyouincludeinthepaperwhateverquestionstheydidn’tknowtheanswertolasttime.(include不能用willinclude或其他形式) 3.完成时是时态测试的重点，注意与完成时连用的句型和时间状语： (1)by/between/upto/till+过去时间、since、bythetime/when+表示过去发生情况的从句，主句用过去完成时。如：Wehadjusthadourbreakfastwhenanoldmancametothedoor.Between1897and1919atleast29motionpicturesinwhichartificialbeingswereportrayedhadbeenproduced.(表示1919年时已发生的情况) (2)by+将来时间、bythetime/when+谓语动词是一般现在时的从句，主句用将来完成时。如：BythetimeyouarriveinLondon,wewillhavestayedinEuropefortwoweeks.Ihopeherhealthwillhaveimprovedgreatlybythetimewecomebacknextyear.(3)bynow、since+过去时间、in/during/for/over/thepast/lastfew(或具体数字)years/days/months，主句用现在完成时,但在itis+具体时间since/before这一句型中，主句更多的时候不用完成时。如：Thechangesthathowetakenplaceplaceinairtravelduringthelastsixtyyearswouldhaveseemedcompletelyimpossibletoeventhemostbrilliantscientistsattheturnofthe19thcentury.ItisfouryearssinceJohnleftschool.(4)在Itisthe+序数词/形容词最高级+that的定语从句中，谓语动词常用现在完成时。如：      Itisn’tthefirsttimethatIhavefoundmyselfinanembarrassingsituation.(5)在nosooner…than…,hardly/scarcely…when/before…句型中，主句常用过去完成时。(6)其他与完成时连用的时间状语：allthiswhile,allthisyear,forsometime,sofar,already,before,just,long,yet等。 4.完成进行时指动作在完成时的基础上还要继续下去。如：      Thecompanyhasbeenpromisingariseinsalaryforages,butnothinghashappened.TheschoolboardlistenedquietlyasJohnreadthedemandthathisfollowershadbeendemonstratingfor. 时态、语态答题思路：(1)先根据选项的区别点确定考题要点为时态，然后回到题句中寻找给出的或暗示的时间状语，缩小选择范围，进而选出正确；(2)根据谓语动词与句子主语或非谓语动词与其逻辑主语的关系，确定句子是主动语态还是被动语态。 二、不定式 1.不定式做主语(1)做形式主语的代词：不定式做主语,通常用it充当形式主语,把做主语的不定式短语后置。 如：Ittookmeonlyfiveminutestofinishthejob.Tobefrank,itisagreatrelieftohavethetaskfulfilledinsoshortatime.(2)引导逻辑主语的介词：不定式的逻辑主语一般由介词for引导,但下列表示人的性格行为特征的形容词做表语时,不定式的逻辑主语则由of引导：absurd,bold,brave,courageous,careful,careless,clever,wise,foolish,silly,stupid,good,nice,kind,thoughtful,considerate,greedy,generous,honest,modest,polite,rude,cruel,selfish,lazy,wicked,wrong。如：Expertssaywalkingisoneofthebestwaysforapersontostayhealthy.It’scleverofyoutohaveinventedsuchadevice.(3)不定式做主语补足语：掌握常用不定式做主语补足语的句型。注意不定式表示的动作发生的时间，并采用相应形式。如：             said              reported              thoughtbe                        todosth.              believedknownsupposedByronissaidtohavelivedonvinegarandpotatoes.Thebankisreportedinthelocalnewspapertohavebeenrobbedinbroaddaylightyesterday. 2.不定式做宾语(1)必须接不定式做宾语的动词：掌握要求接不定式做宾语的动词：agree,afford,aim,arrange,appear,ask,attempt,choose,claim,decide,desire,determine,expect,fail,guarantee,hope,endeavor,intend,long,mean,manage,offer,ought,plan,pledge,pretend,prepare,promise,proceed,prove,resolve,refuse,request,swear,tend,try,venture,wait,wish。如：Eventhoughthechildrenpretendedtobeasleep,thenurseswerenotdeceivedwhentheycameintotheroom.注意:1)有的动词要求特殊疑问词+不定式做宾语,这类动词有：consider,discover,explain,forget,guess,know,learn,observe,remember,see,tell,understand,wonder，如：Whilestillayoungboy,Bizetknewhowtoplaythepianowellandashegrewolder,hewroteoperas,themostfamousofwhichisCarmen.2)如果该特殊疑问词在不定式中做介词宾语,介词往往置于该特殊疑问词的前面。如:Theprofessorcanhardlyfindsufficientgroundsonwhichtobasehisargumentinfavorofthenewtheory.Withoutfacts,wecannotformworthwhileopinionforweneedtohavefactualknowledgeuponwhichtobaseourthinking.(2)可以用不定式做宾语补足语(复合宾语)的动词：下列动词可以用不定式做宾语补足语(复合宾语)：advise,allow,ask,beg,cause,command,compel,enable,determine,encourage,expect,feel,find,force,hate,have,hear,help,inform,invite,let,like,make,mean,need,notice,notify,oblige,order,permit,persuade,remind,request,require,see,send,teach,tell,tempt,trouble,urge,want,warn,watch,wish。注意：画线动词后面的不定式不带to。如：Becauseoftherecentaccidents,ourparentsforbidmybrotherandmetoswimintheriverunlesssomeoneagreestowatchoverus. 3.不定式做定语(1)被修饰的名词前有序数词、形容词最高级或next,last,only,nota,the,very等限定词时，该名词用不定式做定语。如：thefirstwomantosetfootonthemoon第一个登上月球的女性(2)如果其动词要求不定式做宾语，相应的名词一般用不定式做定语。如：tendencytodo→tendtodo,decisiontodo→decidetodoThisbookisanattempttohelpyouuseEnglishandrecognizehowitisused. (3)如果其形容词形式要求接不定式做补语，相应的名词一般用不定式做定语。如：ambitiontodo“干……的雄心”→beambitioustodo“有雄心干……”curiositytodo “对……的好奇心”→becurioustodo“对……好奇”abilitytodo“做……的能力”→abletodo“有能力做……”AccordingtoDarwin,randomchangesthatenhanceaspecies’abilitytosurvivearenaturallyselectedandpassedontosucceedinggeneration. (4)表示方式、原因、时间、机会、权利等名词用不定式做定语，这些名词包括：way,method,reason,time,place,chance,occasion,opportunity,evidence,power,right,movement,drive(运动)，effort等。如：IworkedsolateintheofficelastnightthatIhardlyhadtimetocatchthelastbus.Weappreciateyoureffortstobringaboutacomprehensivesolutiontotheexistingproblem.(5)不定代词something,nothing,little,much,alot习惯上用不定式做定语。如：Thoughwehavemadegreatprogress,thereisstillmuchtobeimproved. 4.不定式做状语不定式做状语主要表示目的、程度、结果、方式。(1)inorderto(do),soasto(do)结构引导目的状语，soasto不能置于句首。如：Tosucceedinascientificresearchproject,oneneedstobepersistent.Iadvisethemtowithdrawsoasnottogetinvolved.(2)so…asto,such…asto,enough…to,too…to结构做程度状语。如：Thesolutionworksonlyforcoupleswhoareself-employed,don’thavesmallchildrenandgetalongwellenoughtospendmostoftheirtimetogether.ThevocabularyandgrammaticaldifferencesbetweenBritishandAmericanEnglisharesotrivialandfewashardlytobenoticed.(3)不定式做结果状语只能出现在句子的末尾，表示不愉快的结果，有时用