初一英语 之 基数词与序数词
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一、分类：英语中数词主要分为基数词和序数词两类。 二、基数词 ： 表示数目的词称为基数词。 （1）基数词的构成法：
●1~12的基数是特殊的，必须牢记。请写下来：_________________________________ ________________________________________________________________________ ●13~19的基数是在3~9的基础上加上后缀-teen [‘ti: n]（音同“听” ）构成的。 其中13，15，18是特殊的。
13——thirteen ; 15——fifteen ; 18——eighteen ●20~90的基数整数是在2~9的基础上加后缀-ty [ti]（*音同“踢” ）构成的。 其中20，30，40，50，80是特殊的。
20——twenty 30——thirty 40——forty 50——fifty 80——eighty ●21~99的基数非整数是：整数-个数 （当中要用连字符号“-”隔开 ）
21——twenty-one 27——twenty-seven 43——forty-three 59——fifty-nine 66——sixty-six 88——eighty-eight 93——ninety-three 99——ninety-nine ●100~900的整百数是：个数（1~9）+hundred (hundred“百”用单数)
100——one(或a) hundred 300 ——three hundred 800——eight hundred ●101~999的非整数是：个数（1~9）+hundred +and+整数-个数 (没有十位数，就直接用个位数)
101——one(或a) hundred and one 309——three hundred and nine 210——two hundred and ten 413——four hundred and thirteen
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540——five hundred and forty 598——five hundred and ninety-eight 970——nine hundred and seventy 999——nine hundred and ninety-nine ●1000以上的基数词在上面的基础上，再在前面加上 个数（1~9）+thousand (thousand“千”用单数)
4，000——four thousand 9，000——nine thousand
1，001——one thousand and one 2，008——two thousand and eight 3，015——three thousand and fifteen 4，040——four thousand and forty 5，069——five thousand and sixty-nine 6，200——six thousand (and) two hundred 7，486——seven thousand four hundred and eighty-six ★在英语里，数字（阿拉伯数字）通常从个位数起往左，每三个数用一个逗号隔开，而汉语习惯每四个数用逗号隔开（注意区别） 从左向右： 第一个逗号——用 thousand千
第二个逗号——用 million千万
第三个逗号——用billion亿 第四个逗号——用trillion万亿 50，000，000—— fifty million
500，000，000—— five hundred million 5，000，000，000—— five billion 50，000，000，000——fifty billion
练习：25,025,874,953—— twenty-five billion twenty-five million eight hundred and seventy-four thousand nine hundred and fifty-three （2）复数形式的基数词
They went to the theatre in twos and threes． 他们三三两两地来到了剧院。 ★表示人的不确切岁数或年代，用几十的复数形式表示。
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He became a professor in his thirties． 他三十多岁时成为了教授。 She died of lung cancer in her forties． 她四十来岁时死于肺癌。 It was in the 1960s． 那是在二十世纪六十年代。
三. 序数词：序数词是指表示顺序的数词
英语中基数词变序数词方法——口诀
口诀 基变序，有规律，后在数词后面加th。 面th加上去。 一二三，特殊记，后one, two, three特殊变。 面字母t,d,d。 八去t，九去e。整数中的y要变成ie f来把ve替。 若是遇到几十几，只变个位就可以。 序数词前要加the 我们一定要牢记。
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解说 举例子 four → fourth first，second，third eight去掉t，nine去掉e。twenty去掉y变成twentieth five和twelve的ve要变成f 。 两位数或两位以上数字只变个eight → eighth nine → ninth five→ twelfth fifth twelve→ thirty-three→thirty-third 位。 序数词前必须加the（上述原则中的除外） the first day 归类表格(一)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 30 40 50 60 70 80 90 100 21 36 基数词(数目/数量的多少) one two three four five six seven eight nine ten eleven twelve thirteen fourteen fifteen sixteen seventeen eighteen nineteen twenty thirty forty fifty sixty seventy eighty ninety hundred twenty-one thirty-six 序数词(顺序和等级) first second third fourth fifth sixth seventh eighth ninth temth eleventh twelfeth thirteenth fourteenth fifteenth sixteenth seventeenth eighteenth nineteenth twentieth thritieth forieth fiftieth sixtieth seventieth eightieth ninetieth hundredth twenty-first thirty-sixth 1-12单独记忆 1-12单独记忆 13-19尾加+teen 13-19尾+th 20-90(整数)尾+ty 以ty结尾的数词,改y为i,+eth 基数-序数 依此类推 四、写出下列基数词的序数词 和它们的简写形式： 例如： one first / 1st eleven eleventh / 11th 1. (基变序，有规律，第1，2，3，特殊记，词尾字母 st nd rd ) one ___/__ two ____/__ three ___/__
twenty-one ________/__ twenty-two ________/__ twenty-three ________/__ thirty- one ________/__
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2. (8减t, 9减 e， 词尾再加th ) eight ___/__ nine___/_
twenty-eight ________/__ twenty-nine ________/__ 3.（第5和第12要注意，f来把ve替，词尾再加th）
five ___/__ twelve_____/_ twenty-five ________/__ 4. (整十基数要变序，要把ty变ie,词尾再加th
twenty _____/__ thirty ______/_ forty_____/_ fifty_____/__ sixty ______/__ seventy______/_ eighty______/__ ninety______/__
五，根据句子意思填空。
1. Children’s Day（儿童节） is on the ____ of June（六月）. 2. There are ____ months（月）in a year(年).
3. Teacher’s Day(教师节) is on the ____ of September（九月）. 4. Three plus(加) six is ______ . 六，选择填空。
( )1. My cousin’s birthday in on the of October. A. three B. first C. the second
( )2. What date is it today? It’s of April. A. twelfth B. the 12th C. 12th ( )3. There are days in a week. A. the seven B. seventh C. the seventh D. seven ( )4.Sunday is the day of a week. A. one B. first C. second ( )5. Twenty-eight minus(减)six is . A. the twenty- second B. twenty-two C. twenty- second ( )6. Four plus(加) is twelve. A. seven B. eight C. nine
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根据题意，填入合适的数词。
1、Sunday is the ( ) day of a week. 2、September is the ( ) moth of a year. 3、October the ( ) is National of a year. 4. There are _______________ days in February. 二、单项选择
1. - How old is your son?
- _____. We had a special party for his _____ birthday last Sunday.
A. Nine; nine B. Nine; ninth C. Ninth; ninth D. Ninth; nine
2. Mrs. Turner have _____ child today. A. second B. the two C. a second D. the second
3. June is the _____ month of the year. A. five B. six C. seventh D. sixth
4. The _____ month of a year is December. A. two B. second C. twelve D. twelfth 5. - What's the date today? - It's _____ .
A. May the fourth B. May four C. the May fourth D. fourth May
6. September is the ________ month（月份） of the year. A. eighth B. ninth C. tenth D. eleventh 7、 There are ________ days in February. A. thirty B. thirty-one C. twenty-eight D. twenty-six
8. How many months are there in a year? There are _______ A. eleven B. twelve C. twenty D. twelfth
9. The Changjiang River is ________ longest river in China. A. the first B. the second C. the third D. the fourth
10. There are months in a year， ______ month is February． A．twelve；two B．twelve；second C. twelve；the second D. twelfth；the second 11. ---When is your birthday，Jeff?
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---My birthday．is______ ．
A. January the thirtieth B. January thirty C. Thirty of January D．Thirtieth of January 12.---What time is it now? ---It is
A. eleven and thirty B．eleven thirty C. thirty eleven D．eleven—thirty
13.There are eight classes in our grade．I'm in ______ . A. Grade Three，Class Two B. Class Two，Grade Three C. grade three，class two D．class two，grade three 14.In our class of the students ______ girls． A. three-fifth；are B. three—fifth；is C. three-fifths；are D．three-fifths；is ( )15. May is ____ of a year. A. the fifth months B. the fifth month C. the five months D. the five month
( )16. ---How many English books are there on the table? ---There is only _____English book on it. A. a B. an C. one D. the ( )17. Is Sunday the ____ day of the week? A. a B. one C. once D. first ( )18. March the _____ is Women’s Day.
A. eighth B. ninth C. tenth D. eight ( )19. September is the _____month of the year. A. nineth B. ninth C. nine D. the twelveth ( )20. December the ____ is Christmas. A. twenty-five B. twenty-fifth C. twentieth-five D. twenty-five ( )16.-What time is it now? –It’s __________. A.No.6 B.six ten o’clock C.half past six
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