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数词:表示数目或顺序的词 数 词基数词:用来表示具体数目序数词:用来表示顺序 基数词的构成1至1 2独立词, 1 3 -1 9 teen加起2 0 -9 0 整十位的数 -ty结尾几十几,连字符“-”莫忘记。几百几,hundred后面and立.你能拼写百,千,百万,十亿吗?注意:当hundred,thousand,million,billion前面有基数词,表示具体数目的时候,不能用复数。如:2 0 0 0人:two thousand people如果他们用来表示概数(不确定的数),用复数形式,并后加of. 如:数百万的学生:millions of students 典型例词考查 3 _ 5 _8 _9 _ 1 1 _1 2 _1 3 _ 1 5 _ 2 0 _3 0 _ 4 7 _ 3 1 5 _ 2 0 0 0 _three five eight nineeleven twelve thirtee n fifteentwenty thirty forty - seventhree hundred and fifteentwo thousand 你能读出四位及以上的数字吗?四位和四位以上的数字的读写:先从后往前数,每三位用一逗号隔开分为一段,从右往左,第一个逗号为thousand,第二个逗号为million,第三个逗号为billion。如:2 ,6 4 8 two thousand six hundred and forty-eight1 6 ,2 5 0 ,0 6 4 sixteen million two hundred and fifty thousand sixty-four5 ,2 3 7 ,1 6 6 ,2 3 4 five billion,two hundred and thirty-seven million, 基数词的用法1 .表示顺序、编号 一般置于名词后,名词大写如:Unit 2第二单元; Page2 0 第2 0页如果数词前有No.,则“No.+基数词”置于名词前。【例句】Whos that in Picture 1 ? 图1中的人是谁?He is a student in No. 9 Middle School. 他是第九中学的一名学生。 2 .表示时刻:英语中的时刻是用基数词来表示的,最常见的形式有两种:直读法。如:6 :3 0 six thirty,7 :5 2 seven fifty-two介词表示法:先分钟,后点钟。表示“分钟数不超半小时”,用“分钟数 + past + 钟点数”表示 如:5 :2 5 twenty-five past five。表示“分钟数超过半小时”,用“(6 0 -分钟数)+to+下一个钟点数”表示,即“差几分到几点”。如:1 0 :4 3 seventeen to eleven。表示“整点钟 直接用“钟点数 (+oclock)”表示。 “半点钟”用half表示,“一刻钟”用a quarter表示。 如:6 :0 0 six(oclock) 1 0 :3 0 half past ten, 4 :4 5 a quarter to five, 7 :1 5 a quarter past seven。 2 . Can you tell me the time?I do believe you can do it .3:0 0 4:1 55:3 06:4 58:2 31 1:5 7 three oclocka quarter past fourhalf past fivea quarter to seven twenty- three past eightthree to twelve 3 .基数词可以和名词一起构成复合形容 注意:名词用单数形式,各部分间用连字符“-” an eight-year-old boy 一个三天的假期 a three-day holiday4 .表示“在某人几十多岁时”,用整十的复数in his seventies 在他七十多岁的时候在她四十多岁时 in her forties5 .表示百分数:数词+percent 百分之2 5 twenty-five percent 6 .表示小数1 .7 5 one point seven five 序数词的构成规律:基变序,有规律,词尾加上th。一二三特殊记,词尾字母t,d,d。八去t,九去e,ve 要用f替。ty变y为ie,后面再加th若是遇到几十几,只变各位就可以。 Can you spell these words? one _ eight_ nine_ twelve_ two_ twenty _ three _ thirty-seven_five_ fifty_ 序数词的用法1 .表示事物的编号,放在名词前the tenth lesson = Lesson Ten2 .表示具体日期September the first 九月一日3 .表示世纪:in the 2 0 0 0 sIn the 2 1 st century 在2 1世纪 5、分数的表达分子用基数词, 分母用序数词。分子超过一, 分母末尾加s。1 /3 one third2 /5 two fifths4 /7 four sevenths4 .序数词前要加the ,但是当序数词前已经有my ,his ,her 等词时,不加the。The first day of a week is Sunday.This is my first day in my new school .注意:不定冠词a/an+序数词,表示“再一,又一”We have tired it three times . W e will try it a fourth time. 课堂检测 There are _(五百)students in our school He is the _(one)teacher to come to school His mother will have a birthday party on his _(二十)birthday(三分之二)_of the students have lunch at school The river is about _(四十)meters wide We will have a _(三天)holiday He begun to learn English _(在他三十多岁时) Look! (数千)_people are dancing. five hundredfirst twentiethtwo thirdsfortythree-day in his thirtiesthousands of Homework 1 .Learn the numbers by heart. 2 . Do the exercises on Page 1 8 .
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