中考英语复习---数词（无答案）

中考英语复习---数词 表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。表示数目多少的数词叫基数词；表示顺序的数词叫序数词。 一、基数词 1.基数词写法和读法： 345　three hundred and forty-five； 2.基数词一般是单数形式，但下列情况，常用复数： 1.)表示一个具体数字时，hundred, thousand, million一律不用复数；在表示一个不确定数字时则用复数。例如： Our country has a population of 1,300 million people. There are three thousand students in our school. 2.)表示"几十岁"；in his forties He is in his early thirties． He died still in his forties． 3.)表示"年代"，用 in +the +数词复数；in the 1980s / 1980’s This took place in the1930s． 二、序数词 1.)序数词的不规则变化及缩写形式： first---1st　second---2nd　third—3rd fifth—5th ninth twelfth twentieth twenty-first----21st 2.)序数词前通常使用定冠词the，但有时使用不定冠词a, an,表示“又一，再一”Try it again, please.请再试一次。 We'll have to do it a second time． Shall I ask him a third time？ 三、 数词的用法 1.倍数表示法 1.) 主语+谓语+倍数（或分数）+ as + adj. + as I have three times as many as you.　我有你三倍那么多。 2.) 主语+谓语+倍数（分数）+ the size (amount，length…) of… The earth is 49 times the size of the moon.　地球是月球的49倍。 3.) 主语+谓语+倍数（分数）+ 形