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数词
1.基数词与序数词
阿拉伯 基数词 序数词 缩写 阿拉伯 基数词 序数词 缩写
1 one first 1st 11 eleven eleventh 11th
2 two second 2nd 12 twelve twelfth 12th
3 three third 3rd 13 thirteen thirteenth 13th
4 four fourth 4th 14 fourteen fourteenth 14th
5 five fifth 5th 15 fifteen fifteenth 15th
6 six sixth 6th 16 sixteen sixteenth 16th
7 seven seventh 7th 17 seventeen seventeenth 17th
8 eight eighth 8th 18 eighteen eighteenth 18th
9 nine ninth 9th 19 nineteen nineteenth 19th
10 ten tenth 10th 22 twenty-two twenty-second /
20 twenty twentieth 20th 33 thirty-three thirty-third /
30 thirty thirtieth 30th 44 forty-four forty-fourth /
40 forty fortieth 40th 55 fifty-five fifty-fifth /
50 fifty fiftieth 50th 66 sixty-six sixty-sixth /
60 sixty sixtieth 60th 77 seventy-seven seventy-seventh /
70 seventy seventieth 70th 88 eighty-eight eighty-eighth /
80 eighty eightieth 80th 99 ninety-nine ninety-ninth /
90 ninety ninetieth 90th / / / /
基数词
1.读数
2.hundred、thousand等使用规则
数词考点口诀：s、of同生共死；遇到数字都得死
hundred 百 2 hundred books、hundreds of books
thousand 千 2 thousand books、thousands of books
million 百万 2 million books、millions of books
billion 十亿 2 billion books、billions of books
序数词
1.物主代词与the
序数词前有定冠词the,除非遇物主（Lucy's ，their，my等）
I gave the second boy a toy.
Lucy's first class/play his piano/my best friend
原则：物主代词与冠词有且只有一个
2.表达方式
123个别记忆 one two three first second third
8去t,9去e eight nine eighth ninth
ve要用f替 five twelve fifth twelfth
见y变成i和e twenty thirty twentieth thirtieth
若是遇上几十几，只变个位就可以 twenty-one twenty-first twenty-one twenty-first
3.常用：楼层、生日
Mike lives on fifth floor.
It's your eighteenth birthday. Let's enjoy ourselves.
数词的应用
1.小数、百分数的表达
23.99 point nine nine
3.1415926.. three point one four one five nine two six.
1% one percent
2% two percent
97% ninety-seven percent
2.编号的表达
名前为序 the fifth boy
名后为基 Boy 5
注意：编号大写
3.时间的表达
3:00 three o'clock
10:30 half past ten
顺读法、 逆读法
10:10 顺读：先时后分 ten nine 逆读：先分后时 nine past ten
12：58 顺读：先时后分twelve fifty-eight 逆读：先分后时 two to one
一刻：a quarter
10:15 a quarter past ten
9:45 特权：three quarters past nine
4.表示年份、年代
（1）年份用基数词表达
in 2022/in 1949
（2）年代用“in the+基数词的复数”表达
in the 1980s/1980's 在20世纪80年代 读作”“ain the twenty twenties”
5.表示年龄
（1）基数词 years old 表示“....岁”
He is 15 years old
（2）at the age of +基数词 表示“在某人多少岁的时候”
He began to play the guitar at the age of 4.
（3）in one's 整十基础词的复数 表示“在某人几十多岁的时候”
in his thirties 在他三十多岁的时候

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