数词（Numerals）数词分为基数词和序数词两种一、基数词1）基数词的构成及读法①Ù 1-12的构成为独立单词②Ú 13-19的构成都以后缀-teen结尾，但thirteen，fifteen，eighteen为不规则变化③Û 20-90的构成都以后缀-ty结尾，但twenty，thirty，forty，eighty为不规则变化④Ü 21-99的构成是在十位数和个位数之间加连字符- e.g. 25 twenty-five⑤Ý 三位数101-999的构成要注意百位数和十位数（个位数）之间用and连接。

e.g.901 nine hundred and one⑥Þ英语中没有“万”这个单位，1000以上而不到100万的数词都用thousand表示⑦ß百万1，000，000 ：one(a) million⑧à千万10，000，000 ：ten million⑨á亿100，000，000 ：one(a) hundred million⑩â十亿1,000,000,000 ：one(a) thousand million（等于美国英语a billion）注：英语数字中，只有hundred后才加and2）基数词的复数形式①Ù Hundred，thousand，million和billion在表示具体数目时，不用复数形式，但在一些习惯表达中，相当于普通名词，可有复数形式 e.g. thousands of years ago②Ú数词复数形式还可以表示不十分精确的年龄、年代和其他表达方式e.g. He died in his fifties.3.基数词的作用①Ù作主语 e.g. Two of the girls are from California.姑娘中有两个来自加州。

②Ú作表语 e.g. He is a little over five.他才五岁多一点。

③Û作宾语 e.g. Give me two.给我两个。

④Ü作定语 e.g. The river is about eighty miles long.这条河大约八十英尺长。

⑤Ý作同位语 e.g. You two take these seats.你们两个坐这里。

二、序数词1）序数词的构成①序数词多数由“基数词-th”构成，序数词前一般加定冠词the②Ú少数序数词构成属特殊情况e.g. One-first two-second three-third five-fifth eight-eighth nine-ninth twelve-twelfth③Û以y结尾的十位整数，先将y改为i，再加-eth e.g. thirty-thirtieth④Ü21以上的多位数，要将末位数改为序数词，前面其他位数仍用基数词e.g. eighty-three—eighty-third nine hundred and sixty-two—nine hundred and sixty-second⑤Ý序数词的缩写形式由阿拉伯数字加序数词的后两个字母构成e.g. first—1st second—2nd2）序数词的用法①Ù作主语 e.g. The third of the month was a holiday.②Ú作表语 e.g. Who was the third?③Û作定语 e.g. We live on the fifth floor.④Ü作宾语 e.g. I was among the first to learn of this.⑤Ý作同位语 e.g. Who is that man, the first in the front row?⑥Þ作状语 e.g. When did you first meet him?注：有时序数词并不指顺序，而是表示“再一，又一”的意思。

此时序数词前要加不定冠词e.g. I want to make a second try.三、数词的用法1) 编号事物的表示编号的事物常用“名词+基数词”表示，也可用“序数词+名词”表示；如果数字较大，需用“名词+基数词”表示①住址、牌号及其他顺序号码the ninth unit\Unit 9 Bus No.103\the No.103 busWorld WarⅡ\the second world war Room 305 76 Chang’an Street②Ú汽车牌照号码、电话号码、货币数目96178 nine six one seven eight Tel:8742589Telephone number: eight seven four two five eight nine $5.46 five dollars forty-six cents2) 时刻的表示法表示时刻用基数词①表示整点可加o’clock，口语中常省略e.g. —Excuse me. What’s the time? —It’s five (o’clock).②表示“几点几分”有两种形式A. 倒读法30分以内用“分钟数+past+钟点数”，表示几点过几分。

超过30分钟用“分钟数+to+下一个钟点数”，表示到几点差几分。

15分钟用a quarter，30分钟用half，不用fifteen或thirty，不可在后面加o’clock。

e.g. 7:10 ten past seven 6:50 ten to seven 3:15 a quarter past three 5:30 half past fiveB. 顺读法第一个基数词表示钟点，第二个基数词表示分钟，“分钟”可用fifteen，thirtye.g. 1:15 one fifteen 10:30 ten thirty3) 年、月、日、时的写法和读法①表示日期用序数词，前面加定冠词 e.g. 3月8日March the eighth②年份一般分为两部分读，先读前两位数，再读后两位数 e.g. 1949 nineteen forty-nine③以上时间合在一起的写法e.g. 1955年10月1日上午10点10:00 a.m. October 1st, 19554) 分数的表示法分数由基数词和序数词构成，基数词代表分子，序数词代表分母，除了分子为1的情况，序数词都要用复数形式。

带分数中的整数用基数词表示，并用and和分数隔开。

e.g. 1\4 one-fourths 3-2\5 three and two-fifths5) 小数、百分数的表示①Ù小数的表示 e.g. 6.4 six point four 12.409 twelve point four oh nine②表示百分数用“基数词+percent(per cent)”形式 e.g. 50% fifty per cent数词练习题一、将下列数字与词语写成英语：（1）6 _____________（2）89_____________ （3）107______________（4.）2405_______________ （5）7,000,000____________________（6）5/6 ______________________（7）65％_____________________ （8）1.25 ______________________(9)第五________________(10)第三十一___________________ (11)9：00_________________________ (12)10:15_________________________(13)1:58___________________________ (14)12:30_________________________二、选择填空。

( )1．March is ________month of a year．A．a three B．the third C．a third( )2．We will have a meeting at 8:05_______．A．five to eight B．eight five C．eight to five( )3．Eight plus eight is______________.A．sixteen B．sixty-four C．one( ) 4．He is an ______________boy．A．eight years B．eight-year-old C．eight-years-old( )5．I was born ___, 1982.A. on June 2rdB. in June 2ndC. on June twoD. on June 2( ) 6．The wall is___________.A．four meters long B．four meter long C．four-meter long( )7．What’s the date today? It’s__________．A．March the eight B．March eighth C．eight，March( )8．It’s ____ from our home to the zoo.A. two and a half hours’walkB. a half and two hours walkC. two hours and a half hour’s walkD. two and a half hour’s walk( )9．About_____________ of the earth’s surface is covered with water.A. three-foursB. three-fourthC. three-fourths( )10. He went down to the village which was__________miles away from the city.A. three hundredsB. three hundredC. three hundreds of( ) 11.If you go out at night, you’ll be able to see ____ starts.A. thousands ofB. thousand ofC. nine thousands ofD. thousands( ) 2.Monday is ___ day of the week.A. firstB. the firstC. the secondD. second( ) 3.You’ve done it twice. Why not try ____ time?A. thirdB. the thirdC. a thirdD. once( )14.Which is the____ month? It’s September.A. nineB. ninethC. ninthD. ninety( )15.There are ___ floors in the building and he lives on the ____ floor.A. eighteen, fifteenB. eighteenth, fifteenthC. eighteen, fiveteenD. eighteen, fifteenth ( )16.Will you be back in ____ ?A. one or two minutesB. one minute or twoC. two minutes or oneD. two or one minute ( )17.Mary’s uncle went to France ____.A. in his thirtiesB. on his thirtiesC. at his thirtiesD. about his thirties( )18.The headmaster wrote a ___ report.A. two thousand wordsB.two-thousand-wordsC. two-thousand wordsD. two-thousand-word ( )19.A UN report says that the word population will pass six billion by the end of ____ century.A. twentiethB. twentyC. the twentiethD. the twentyth。