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1、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.1.1twi
2、ce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
3、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,thesameamountofacreageproducestwiceasmanyapplesasitdidin1
4、910.#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.In1914atotalo
5、f469,000carsandtruckswereproducedintheUnitedStates,butin1929almosttwicethatnumberoftrucksalonecameofftheassemblylines.#3.AmericanproductivityisdeclininginrelationtoEurope’s;theenergyexpendedperunitofproductionintheUnitedStatesisasmuchastwicethatexpendedinWestGermany.#4.AccordingtosurveysbytheNa
6、tionalInstituteonDrugAbuse,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
7、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