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(共42张PPT)
数词
定义：数词是表示数目和顺序的词。
一、基数词
基数词主要表示具体的数量、时间、年龄等。
one, two, three, hundred, thousand, million, billion
基数词的用法
1.表示数量的多少
There are twenty-six girls in our class.
1. Do you think there is any room for us ______
two B. the two C. second D. the second
2. -- How many students are there in your class
-- _______________.
A. twenty nine B. Thirty and two C. Forty-five D. Fifties
练一练
注意：表示确定的数目和不定数目
（1）表示确定的数目："具体数字+数词+名词复数"
six thousand eight hundred students
four score and six years
（2）表示不定数目："数词+-s+of+名词复数"
hundreds of graduates
dozens of eggs
hundred，thousand，million, dozen (一打，12)，score （20） 等词前有one, two, three等具体数字时，这些词的词尾不加-s。
hundred，thousand，million, dozen (一打，12)，score （20） 等词前无具体数字时，其后加-s,并与of连用，表示不定数目。
2. There are __________ days in a year.
A. three hundreds sixty-five B. three hundreds and sixty-five
C. three hundred and sixty-five D. three hundred and sixty five
练一练
1. ____ girls took part in the Happy Girl Competition but only few of them succeeded.
A. Million of B. Many million of C. One million of D. Millions of
2.表示编号
page 8
Line 3
Bus 811
Building 2
Postcode 430070
Tel 888888
No. 10 Downing Street
由"名词单数+基数词"构成，此时名词和基数词的第一个字母通常都大写。
3.表示年龄
a ten-year-old boy
at the age of four
when he was four years old
in his twenties
in my thirties
在某人几十岁时
10. The old man began to learn to drive a car at the age of __________.
A. sixty B. the sixtieth C. sixties D. sixty years old
练一练
“a/an+基数词-名词单数形式”结构作定语。
该结构相当于“基数词+该名词的所有格（名词的单复数形式由基数词决定）”。
a ten-minute ride (= ten minutes’ ride)
4. 复合形容词做定语
“a/an+基数词-名词单数形式-形容词”结构作定语。
a five-meter-wide road
a three-year-old boy
a three-metre-long rope
基数词 + 名词 + 形容词：基数词、名词和形容词之间无连接符，在句子中充当表语，位于系动词（be）之后。如果基数词大于1，名词用复数形式。
I’m 1.6 meters tall.
The road is 5 meters wide.
15. Mr. Green has lived in the ___________ hotel since he came to China.
five-star B. five-stars C. five star’s D. five stars
16. The river is very long and it is about ____________.
15 meters long B. 20 meters wide C. 30 meters high D. 50 meters tall
17. Each of us has to write a __________ report every two weeks.
two-hundred-word B. two-hundreds-word
C. two-hundreds-words D. two-hundred-words
练一练
5.表示年份和年代
in the 1990s
in the 1970s
"in+the+逢10的表示年份的数词+-s"表示"在……世纪……年代"。
5.表示年份和年代
46BC
79AD
2020=the year of 2020
年份用基数词表达，公元前为BC,公元后为AD。
5.表示年份和年代
the 21st century
the 2000s
世纪的表达方式：the+序数词+century
the+基数词的复数形式
14. We all think that the _______ century will bring us more hopes.
A. twenty-first B. twentieth-first C. twenty-one D. twentieth-one
练一练
5.表示年份和年代
the early nineteen eighties
the mid nineteen sixties
the late nineteen nineties
二十世纪九十年代末期
二十世纪六十年代中期
二十世纪八十年代初期
表示“在…年/世纪/年代”要用介词in
in 1949,
in the 21st century,
in the early twenties
5.表示年份和年代
January (Jan.)
February (Feb.)
March(Mar.)
April(Apr.)
May(没有缩写)
June(Jun.)
July(Jul.)
August(Aug.)
September (Sept.)
October(Oct.)
November(Nov.)
December(Dec.)
5.月份表达
英式：
2020年7月28日 → 写作：28th July, 2020
读作：the twenty-eighth of July, twenty twenty。
美式：
2020年7月28日 → 写作：July 28th , 2020
读作：July （the）twenty-eighth, twenty twenty，通常情况下the是不读出来的。

6.日期的表达
表示“在…日”要用介词on，例如：on July 28th , 2020
2002年1月17日。
英式：
写：17(th) January, 2002
读：the seventeenth of January, two thousand and two
美式：
写：January 17(th), 2002
读：January the seventeenth, two thousand and two
7.时刻的表达
（1）顺读法（先时后分）：
9:25 nine twenty-five 4:30 half past four
（2）逆读法（先分后时）:
5:20 twenty past five
6:37 twenty-three to seven
2:45 a quarter to three
（3） 几点整"一般用"钟点数+o'clock"表示。
在半小时（含半小时）之内，用"分钟数+past+钟点数"，表示"几点过几分";
超过半个小时，用"所差分钟数+to+下一钟点数"，表示"差几分到几点"。
6:10
8:30
2:40
6:10
4:20
10:25
10:35
5:50
9:49
11:30
2:30
9:15
3:45
six ten
eight thirty
two forty
ten past six
twenty past four
twenty-five past ten
twenty-five to eleven
ten to six
eleven to ten
half past eleven
half past two
fifteen past nine ; a quarter past nine
fifteen to four ; a quarter to four
口诀 举例
基变序，有规律，后面th加上去 four → fourth
一二三，特殊记，后面字母t, d, d first，second，third
八去t，九去e，整数中的y要变成ie eight → eighth
nine → ninth
twenty → twentieth
f 来把ve替 five → fifth
twelve → twelfth
若是遇到几十几，只变个位就可以 thirty-three → thirty-third
序数词前要加the 我们一定要牢记 the first day
二、序数词
序数词是表示顺序的词。
序数词的用法
1.序数词表顺序
She is the second in our class．
Mother was my first teacher in my life.
【注意】当序数词前有形容词性物主代词或名词所有格修饰时，其前不用冠词。
常用结构："the+序数词+单数名词"。
1. The _____ World Table Tennis Championship began _____ the morning of May 25th, 2010 in Moscow, Russia.
A. Fifty; in B. Fiftieth; on C. fiftieth; in D. fifty; on
2. – There is a wrong word in Line __________.
-- Where
-- In the ________ line.
A. Two, two B. Two, second C. second, two D. second, second
练一练
2.序数词表"再……，又……“
Please give me a second chance.
常用结构："a/an+序数词+单数名词"。
1. Although I failed four times, my father encouraged me to have a ____ try.
second B. third C. fourth D. fifth
2. -- Good news! Bill won ____ medal in the long jump just now.
-- Really That’s his ____ one at our sports meeting.
A. a; four B. an; fourth C. a; fourth D. an; four
练一练
3. 当表达“年月日”时，序数词前不用the。
He was born on June 6th, 1974.
4. 当序数词在句中作状语时，序数词前不用 the。
Who got there second
Who came first in the race
1. – When is Mr. Wang going to Japan
-- On ________.
June B. June 4th C. the year 2021 D. June, 2010
2. Lincoln was born on ______________.
February 12, 1809 B. 1809, February 12
C. 1809, 12 February D. February 1809, 12
练一练
注意：
1. 百分数修饰名词：百分数 + of + 名词
2. 百分数修饰的名词在句子中作主语时，谓语动词是用单数还是复数取决于名词，即与名词保持一致。
三、百分数
12 % → 12 percent
1.2 % → 1.2 percent
百分数的表示法：基数词 （或小数）+ 百分号%，百分号% 读作percent， 其中percent只能用单数形式。
65 percent of children play computer games.
90 percent of the land is cultivated.
四、分数
分数是由基数词和序数词相结合来表达的。
1.构成规则
分子用基数词，分母用序数词；如果分子大于1，分母要用序数词复数形式。如：
① one third
② two thirds
Only one-fifth of air consists of oxygen.
One-fifth of the students have signed up for this volunteer activity.
1/2
1/4
分数修饰的名词在句子中作主语时，谓语动词是用单数还是复数取决于名词，即与名词保持一致。
=a /one quarter
= a/one half
= one fourth
1. Nearly _______ of the earth ______ covered by sea.
three fourth; is B. three fourths; is
C. three fourth; are D. three fourths; are
练一练
小数点前的数按普通基数词的读法读，小数点后的数按单个数字一一读出。
小数点后的0通常读作[ ]或zero，小数点读作point。
例如：15.037 读作 fifteen point zero three seven

五、小数
表示倍数时，通常借助half, once, twice, double, triple, three times等之类的词。
三倍及三倍以上的表达方式：基数词 + times
六、倍数
Half of our money goes on food.
Many things now cost double what they did a few years ago.
This room is triple the size of that one.
注意：
“by +倍数”表示增加或减少了多少倍
The production of goods has been increased by four times this year.

【对比】
The population of China has increased to 1.4 billion.
增加了…
增加至…
翻译下面的词组
1. 二年级一班
2. 上百辆轿车
3. 在19世纪
4. 三分之二
5. 两千名学生
Class 1 Grade 2
hundreds of cars
in the nineteenth century
two thirds
two thousand students
练一练
请找出画横线部分的语法错误并改正
1. I got a beautiful bike on my twelve birthday. I like it very much.
2. The basketball team of our school ranks the three in the match.
3. Now, everybody, please turn to Page nine and look at the nine picture.
4. Every year thousand of people visit the famous city.
5. There are about two hundreds students in the newly built school.
6. My school isn’t far from here. It’s only thirty-minutes’ walk.
7. Threes four of the world’s books and newspapers are written in English.
练一练
twelve改为twelfth
the three 改为third
第一个nine改为Nine, 第二个nine改为ninth
thousand改为thousands
hundreds改为hundred
thirty-minutes’改为thirty minutes’或a thirty-minute
Threes four改为Three fourths
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