资源简介 第6章 数词表示数目多少或顺序先后的词叫做数词。数词分为基数词和序数词。基数词表示人或事物数目的多少,序数词表示人或者事物顺序的先后。一.基数词的构成基数词 例词 构成及读法1~12 one/two/three/four/five/six/seven/ eight/nine/ten/eleven/twelve 基数词1-12是独立的单词13~19 thirteen/fourteen/fifteen/sixteen/seventeen/eighteen/nineteen 13-19基本上是在3-9后加-teen构成 (两个音节都重读) 。但注意13,15,1820~90 twenty/thirty/forty/fifty/sixty/seventy/eighty/ninety 20-90的整十位数是在2-9后加-ty构成 (第一个音节重读) ,但注意20,30,40,50,80几十几 twenty-one/ fifty-two 表示“几十几”十位与个位之间加连字符“-”。几百几十几 one hundred and thirty-four one hundred and six 百位和十位之间、百位和个位之间加and100 1, 000 1, 000, 000 1, 000, 000, 000 a/one hundred a/one thousand a/one million a/one billion forty thousand 四万 two hundred million 两亿543, 621, 304, 782 five hundred and forty-three billion, six hundred and twenty-one million, three hundred and four thousand, seven hundred and eighty-two 1000以上的数字,从后向前数,每三位加“,”。 第一个“,”前为thousand; 第二个“,”前为million; 第三个“,”前为one billionhundred, thousand, million, billion 表示确定数目时,不用复数形式,后面跟名词时,名词需用复数形式; 表示概数时,数词必须用复数形式,且后面跟of。如:thousands of 成千上万的 巧记: hundred, thousand, million等,有时含糊有时清;清时两无,含糊时两有 (有s和of) 。★助记二.基数词的其他用法用法 例句基数词可在句中作主语、宾语、表语和定语 Twenty of them are Young Pioneers.用于名词之后表示顺序编号 Please open your books and turn to Page 28.表示时间 5:50 five fifty可表示年份、时间 (钟点) 、电话号码、年龄等 I was born on July 12, 1989.表示“世纪年代”,用“in+the+基数词复数” in the 1990s 在20世纪90年代in one’s+整十的基数词复数,“在某人……多岁时” The old woman is in her nineties.数字-名词(-形容词) We have a seven-day holiday in October. She is an eight-year-old Chinese girl.小数表示法:小数点应读作point 0. 04 zero point zero four百分数表示法:百分数用percent表示 3% three percent年的基本读法:分成两位一读 1949: nineteen forty-nine 2019 : twenty nineteen 公元763年: seven hundred and sixty-three A.D.一个半月 one month and a half one and a half months次数 once, twice, three times, four times一.序数词的构成范围 例词 特点1~3 first, second, third 单独记4~19 fourth, seventeenth 在大多数基数词末尾直接加上-theighth, ninth, fifth, twelfth 八去t,九减e,f来把ve替20~90 twentieth, ninetieth 把基数词末尾的-y变为ie,再加-th21以上的多位数 twenty-first, one hundred and seventy-eighth 个位数变成序数词,其余不变百、千、百万 hundredth, thousandth, millionth★助记二.序数词的用法1. 序数词在使用时要加定冠词the;但当序数词前有形容词性的物主代词或名词所有格修饰时,不用定冠词the.The first is always better than the second.This is my third time to Shanghai.不定冠词a/an与序数词连用,表示“又一;再一”I have been to Beijing twice, but I would like to go there a third time.表示日期,年代在19世纪:in the 19th century.表示编号时,可用“the+序数词+名词”或“名词+基数词”Let’s study the fifth lesson. = Let’s study lesson five.5.表示分数时,分子用基数词,分母用序数词。当分子大于1时,分母的序数词后面要加-s1/3: one third 3/5 :three fifths★助记 展开更多...... 收起↑ 资源预览