专题六 数词与主谓一致 一、数词 1.基数词 (1)注意几个不规则的基数词的写法。如:eleven,twelve,thirteen,fifteen,twenty,thirty,forty,fifty等。 (2)注意英语中的数量以三位为一个单位,一般对应阿拉伯数字的写法每三位加一个逗号,分别是thousand,million和billion。如:ten thousand=10,000;one hundred million=100,000,000。 (3)数词hundred,thousand,million,billion,dozen,score表示确切数目时不加s,但若表示不确切数目时,要用复数形式,与of构成短语。如:一万:ten thousand;成千上万的:tens of thousands of;两打鸡蛋:two dozen eggs。 (4)年代表达方式有两种写法。如:20世纪90年代:in the 1990s或in the 1990’s。
2.序数词 (1)序数词前面一般加the,多数序数词由基数词加th构成。如:the fifteenth;以y结尾的基数词变化时,先把y改成i,再加eth。如:twentieth。注意几个不规则的序数词的写法。如:first,second,third,fifth,eighth,ninth,twelfth等。
(2)序数词常可缩写,其形式为阿拉伯数字加序数词的最后两个字母。如:1st,2nd,3rd,4th,21st,22nd,23rd,24th。 3.小数 小数点用point表示,小数点后的数用个位基数词表示。如:0.567—zero point five six seven。 4.分数 分子用基数词,分母用序数词,如果分子大于1,分母须加s。如:1/5—one fifth/onefifth;3/4—three fourths/threefourths。 5.百分数 百分号用percent(per cent)或%表示。如:19.56%—nineteen point five six percent。 6.倍数表达法 (1)倍数+as+形容词/副词(原级)+as。 This bridge is three times as long as that one. (2)倍数+形容词或副词的比较级+than。 This bridge is three times longer than that one. (3)倍数+the size/length/weight...+of+表示比较对象的 This bridge is three times the length of that one. (4)倍数+what引导的从句。 The college is twice what it was 5 years ago. (5)倍数+that+of+表示比较对象。 The money he earns is three times that of hers. [学以致用] 用适当的词填空或完成句子 1.Two________(five) of the land in that district is covered with trees and grass. 2.It is not rare in the________(90) that people in their________(fifty) are going to university for further education. 3.It took us quite a long time to get there.It was______________________(三小时的旅程). 4.He lived in____________________(5楼的506房). 5.About______________(3千人) took part in the demonstration against the war on Iraq. 6.It is reported that only____________________________(十分之三) of the American people think that the war is going on successfully. 7.About________________________(百分之七十的志愿者) are from universities. 8.Jack’s salary is $5,000 a month,which is________________________________(John的三倍). 答案 1.fifths 2.90s;fifties 3.a threehour journey 4.Room 506 on the fifth floor 5.three thousand people 6.threetenths 7.seventy percent of the volunteers 8.three times the amount of John’s/three times as much as John’s
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