double和twice的用法

1.倍数的表达i.xtimes(twice)+the+n.(twice还能做determiner)ii.xtimesadj.(比较形式)thaniii.xtimesasadj.as注意里面的adj.要和前面的名词匹配Adoxtimesasadj.…xasBdoiv.xtimes+what分句(名词性从句相当于名词)v.x-foldvi.double,triple,quadruple,quintuple,sextuple3）Xtimesmorethan2.关于twice用法;twice只做副词和限定词，因此twice引导的部分在句子中充当什么角色由twice后面的成分决定.1.1twice做副词，后面接形容词和副词：twiceasmany…as;twiceasmuch…as;Thefarmhasmorethantwiceasmanycowsasithaspigs.:农场有多于猪两倍多的牛的数量（农场牛的数量比猪的两倍还要多）。（很多人会误读为猪比牛多。）解读方法：可以类比一下AhasBtwiceasmanyasC这个比较句型也可以写为AhastwiceasmanyBasC.所以句子的核心是AhasB，即：Thefarmhascows.详细解读：twiceas…as中前一个as是副词，morethantwiceas修饰many；而asithaspigs中的as自然是个连词，所以后面跟的是一个adverbialclause（状语从句/副词从句），而as…as句型比较特殊，后面的as要与前面as所修饰的内容相呼应，所以asithaspigs应该与前面as所修饰的对象many相呼应，即asithaspigs也是修饰了many。不管怎么说asithaspigs都不是核心成分。这样翻译过来就是农场有牛，相当于两倍多的猪。故，牛多猪少。#1.Today,becauseofimprovementsinagriculturaltechnology,thesameamountofacreageproducestwiceasmanyapplesasitdidin1910.#2.如AdoesB,twiceas..as，因为as...as...是形容词就近修饰B，即as...as...本身是同位语修饰词，所以twiceas...as...就是同位修饰语(appositivemodifier);1.2twice做限定词,后面接名词性成分：twice+n.(可以是代词，比如that);twice+what从句;#1.Inthe1980’stherateofincreaseoftheminoritypopulationoftheUnitedStateswasnearlytwicewhatitwasinthe1970’s.#2.In1914atotalof469,000carsandtruckswereproducedintheUnitedStates,butin1929almosttwicethatnumberoftrucksalonecameofftheassemblylines.#3.AmericanproductivityisdeclininginrelationtoEurope’s;theenergyexpendedperunitofproductionintheUnitedStatesisasmuchastwicethatexpendedinWestGermany.#4.AccordingtosurveysbytheNationalInstituteonDrugAbuse,about20percentofyoungadultsusedcocainein1979,twicethenumberreportedinthe1977survey.1.3其他注意点:Twice做副词,可以跟在动词后面,thinktwice;3、用动词表达倍数：double/triple/quadruple/quintuple/sextuple----》这些动词可以做形容词(double还能做adv,predeterminer)sth.doublesth.;sth.isdoubled;sth.double(adj.);几个永远错误的形式：(1)producedouble；adoublingof;produceadoubling(2)asmuchastwicetheapples(much与apples矛盾)（要改为twiceasmanyapplesas;sth.doublesth.）*：这几个动词可以用主动也可以用被动，但是不能和as搭配;（差不多记住这句话就可以）4三类表示倍数的形容词为：twofold,threefold,fourfold,tenfold等。以twofold为例，其意思为twotimesasmuchorasmanyofsomething。该类词为形容词，多用于构成形容词＋名词的词组，如：athreefoldincreaseinrevenue，少用于比较两个事物之间的倍数关系。5.关于double用法;2.1double可以是名词,动词(vi&vt),形容词,副词,限定词;2.2double做限定词时用法与twice相同2.3double跟在动词后面做副词，用法同twice(seedouble)--double做副词就这么一个用法，比twice单调;2.4没有doubleas…as只有twiceas…as;2.5做形容词,应该是thedoubleprice或者adoubleamount,注意冠词在前;2.6做动词,可以及物,比如Adoublesitssizeto…;或者不及物,比如Adoublesinsize.morethandoublethe1.4percentgrowthrate，其中double是动词，morethan是副词。对于morethandoubled或ismorethandoubled的区分技巧：把morethan脱去不看，doubled是一般过去时，而isdoubled是被动语态Double和twice都要注意,做同位语有时紧靠修饰词,有时被分隔保持句子平衡,如：1.AccordingtosurveysbytheNationalInstituteonDrugAbuse,about20percentofyoungadultsusedcocainein1979,twicethenumberreportedinthe1977survey.这里twicethenumber跳过usedcocainein1979.-------即同位语可以跳过比较短的句子成分修饰到主句主语上去:1.thewholetruthcameoutthatheisabadguy.这里that从句跳过cameout做wholetruth的同位语.v4.AsurveybytheNationalCouncilofChurchesshowedthatin1986therewere20,736femaleministers,almost9percentofthenation’sclergy,twiceasmuchas1977.A.twiceasmuchas1977B.twiceasmanyas1977C.doublewhatitwasin1977D.doublethefigurefor1977（figure和20,736femaleministers对应，正确，但是可能这里用number比较好，个人见解）E.anumberdoublethatof1977'sThenumberofpeopleflyingfirstclassondomesticflightsrosesharplyin1990,doublingtheincreaseofthepreviousyear.a.doublingtheincreaseof（因为逻辑意思上比较跳跃，后面的increase和前面的哪个名词对都不上，所以用doubling，修饰rose）b.doublingthatoftheincreaseinc.doubleasmuchastheincreaseofd.twiceasmanyastheincreaseine.twiceasmanyastheincreaseofAccordingtosurveysbytheNationalInstituteonDrugAbuse,about20percentofyoungadultsusedcocainein1979,doublingthosereportedinthe1977survey.(A)doublingthosereportedinthe1977survey(B)todoublethenumberthe1977surveyreported(C)twicethosethe1977surveyreported(D)twiceasmuchasthosereportedinthe1977survey(E)twicethenumberreportedinthe1977survey我同意Ron的说法，E虽然是答案，但是也是有问题的2.Becauseof后只能加简单的名词结构，becauseofsb’sdoing一定要改成because这种情况同样适用于dueto，despite（indespiteof），asaresultof3whetherornot的使用：(见thehandbookofgoodenglish)1)在引导宾从的时候只能够用whether，而不能加ornot，否则累赘2)在引导状从的时候必须加上ornot，即whetherornot.whether表示列举时候的用法：WhetherA,B,orC.4.如果but后面接名词是不能有instead的，因为but是介词；但是如果but后面接动词就变成了连词，中间加副词instead没问题。Prep071-73：Evolutionarypsychologyholdsthatthehumanmindisnotablankslatebutinsteadcomprisesspecializedmentalmechanismsthatweredevelopedtosolvespecificproblemshumanancestorsfacedmillionsofyearsago.5.While在表示转折对比时，有两件events同时发生的含义。whileitthenprovedunabletohandletheincreaseinbusiness中while和then是矛盾的两个词，while强调同时，then强调先后6.下面三种形式无区别（后两种强烈语气，不可以随意删掉so）前后都要用句子，不能只用短语。Justas…,so…Justasyousow,soyouwillreap主从句要尽量形式对称Justas…,as…Justasyousow,asyouwillreap主从句要尽量形式对称Justas…,sotoo…主句要部分倒装(sotoo后是主句)Justasyousow,sotoowillyoureapsowith是错误结构。(prep1-15)aswith的结构在日常语法中是对的，但用于GMAT语法中，需要有其他结构与之平行:大全938.Withdiamonds,aswithallgems,youshouldaskforawrittendescriptionofyourpurchase;thedescriptionmayproveusefullaterifyouhavereasontobelievethejewelermisledyou.单纯的aswiththecase+prep.(of/with/in)+sth.结构错误，应该用asisthecase+prep.(of/with/in)+sth.prep1-39Asisthecasewithtraditionalpharmacies,prescrip