初中英语语法复习-数词.pptVIP

Numbers 数词 1. 基数词：表示数目的词称为基数词。 D．百位数 个数基数词形式加“hundred”，表示几百，在几十几与百位间加上and． 101 one hundred and one　　 320 three hundred and twenty 648 six hundred and forty-eight E．千位数以上 从数字的右端向左端数起，每三位数加一个逗号“，”。从右开始，第一个“，”前的数字后添加 thousand，第二个“，”前面的数字后添加 million，第三个“，”前的数字后添加 billion。然后一节一节分别表示，两个逗号之间最大的数为百位数形式。 热门考点： １．in one’s + 整十的复数形式 (在某人几时岁时) 　 My parents are in their forties. 　 Mr. Green is in her fifties. ２．表示数量的名词的使用： 　 Several hundred students five thousand people 序数词 first 1st twentieth 20th second 2nd twenty-first 21st third 3rd thirtieth 30th fourth 4th fortieth 40th fifth 5th fiftieth 50th sixth 6th sixtieth 60th seventh 7th seventieth 70th eighth 8th eightieth 80th ninth 9th ninetieth 90th 1. 序数词一般由基数词后加th构成，前面一般加定冠词the。 the eighteenth, the two hundredth 2. 以y结尾的基数词构成序数词时，先把y改成i，再加eth。 The fiftieth, the twentieth 3. 不规则的序数词有以下几个 first, second, third, fifth, eighth, ninth, twelfth 分数，小数 百分数 时间和钟点 Thanks 一.基数词、序数词 二.数词的表示法 one eleven twenty two twelve thirty three thirteen forty four fourteen fifty five fifteen sixty six sixteen seventy seven seventeen eighty eight eighteen ninety nine nineteen ten four thousand three hundred and twenty-one 7,654,321 1,987,654,321 4,321 one billion nine hundred and eighty-seven million,six hundred and fifty-four thousand three hundred and twenty-one seven million, six hundred and fifty four thousand three hundred and twenty-one 1. hundred thousand (表示具体数字) million bill