double和twice的用法..docVIP

倍数的表达 i. x times(twice) + the + n. (twice还能做determiner) ii. x times adj. (比较形式) than iii. x times as adj. as 注意里面的adj.要和前面的名词匹配 A do x times as adj. … x as B do iv. x times + what 分句 v. x-fold vi. double, triple, quadruple, quintuple, sextuple 3）X times more than 2. 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：twice as many…as; twice as much…as; The farm has more than twice as many cows as it has pigs.: 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A has B twice as many as C这个比较句型也可以写为A has twice as many B as C. 所以句子的核心是A has B，即：The farm has cows. 详细解读：twice as …as中前一个as是副词，more than twice as修饰many；而as it has pigs中的as自然是个连词，所以后面跟的是一个adverbial clause（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as it has pigs应该与前面as所修饰的对象many相呼应，即as it has pigs也是修饰了many。不管怎么说as it has pigs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, because of improvements in agricultural technology, the same amount of acreage produces twice as many apples as it did in 1910.#2. 如A does B, twice as..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twice as...as...就是同位修饰语(appositive modifier); 1.2 twice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. In the 1980’s the rate of increase of the minority population of the United States was nearly twice what it was in the 1970’s.#2. In 1914 a total of 469,000 cars and trucks were produced in the United States, but in 1929 almost twice that number of trucks alone came off the assembly lines.#3. American productivity is declining in relation to Europe’s; the energy expended per unit of production in the United States is as much as twice that expended in West Germany.#4. According to surveys by the National Institute on Drug Abuse, about 20 percent of young adults used cocaine in 1979, twice the number reported in the 1977 survey.1.3 其他注意点: ? ?Twice做副词, 可以跟在动词后面, think twice;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