第四节 数词
数词是表示数目、数字和顺序的词。数词可分为基数词和序数词两种。
考点:
1.基数词
2.序数词
一、基数词
表示人或事物数量多少的词叫基数词。
基数词一般用作定语、主语、宾语、表语或同位语。
基数词的构成:
1.1—12的基数词是独立的单词,有其各自的形式。
one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve
2.13—19的基数词都以后缀-teen结尾,单词的两个音节重读。
thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen
3.20—90的整十数都以后缀-ty结尾。
twenty,thirty,forty,fifty,sixty,seventy,eighty,ninety
4.十位数与个位数之间加连字符“-”构成。
例:21 twenty-one, 99 ninety -nine
5.百位和十位之间加and。
例:101 one hundred and one, 158 one hundred and fifty-eight
6.1000以上的数字,从后往前数,每三位数作为一个单位,分别为thousand,million,billion。在每一个单位内,按三位数构成拼写。
例:9,308,657,421
nine billion three hundred and eight million six hundred and fifty -seven thousand four hundred and twenty -one
二、序数词
表示人或事物顺序的词叫序数词。
序数词一般用作主语、宾语、定语、状语或表语。
序数词的构成:
1.1—12的序数词有其各自的形式。 first,second,third,fourth,fifth,sixth,seventh,eighth,ninth,tenth,eleventh,twelth
2.13—19的序数词在词尾加-th。
thirteenth,fourteenth,fifteenth,sixteenth,seventeenth,eighteenth,nineteenth
3.20—90的整十数去y加ieth。
twentieth,thirtieth,fortieth,fiftieth,sixtieth,seventieth,eightieth,ninetieth
4.20到100间的非整十的序数词表达为前基数词,后序数词。
例:第25 twenty-fifth第46 forty-sixth
三、数词的应用
1.序数词前一般加定冠词the,但序数词与不定冠词a/an连用时,表示“又一,再一”。
例:You've done it three times.Why not try a fourth time
2.数词前加every,表示“每……;每隔……”。
例:every ten days =every ninth day每十天(每隔九天)
3.基数词的复数形式表示年代和年龄。
(1)表示年代:in+the+年份的复数“在几世纪几十年代”。
例:在十九世纪七十年代in the 1870s
(2)表示年龄:“in+one's+整十的复数”表示一个不确定的年龄。
例:在他四十多岁时in his forties
4.hundred /thousand /million /billion
(1)hundred /thousand /million /billion前有基数词修饰时,其后不加s,也不加of。
例:There are two thousand students in our school.
(2)hundred/thousand /million /billion后接of时,通常用复数。
例:Every year thousands of visitors come to our town.
(3)名词前有the修饰时,hundred /thousand /million /billion通常用单数,后接of。
例:Two hundred of the students in our school are from the countryside.
练习:
单项选择
( )1.—Mom,I failed twice.I feel upset.
—Don't worry.Why not try_______time
A.a third B.third C.the third
( )2.About_________tourists from all over the world come to visit these palaces every year.
A.two millions B.two million C.two -millions
( )3._________the students joined the club last month.
A.Two hundred B.Two hundred of C.Two hundreds
( )4.In his_______,he sailed around the world in his boat.
A.fortys B.forties C.fortieth
答案:1.A 2.B 3.B 4.B
5.“几个半”的表达法
基数词+and+a half+名词复数=基数词+名词复数+and+a half
例:two and a half hours =two hours and a half
6.日期表达法
日用序数词,年用基数词。
例:2018年6月25日
June the twenty-fifth,two thousand and eighteen或the twenty-fifth of June,twenty eighteen
7.分数的表达法
(1) 分子用基数词,分母用序数词。
例:1/5 one fifth
当分子大于1时,分母加复数。
例:3/4 three fourths
分数词的几种特殊形式
例:1/3 one third =a third1/4 one fourth =a quarter
分数+名词作主语时,谓语的单复数由名词的单复数决定。
例:One third of the workers have a rest today.
小数的表达法
小数点为point,小数点前按基数词的读法,其后需把数字逐一读出。
如:17.83读作seventeen point eight three
百分数的表达法
百分号(%)为percent
20%写作twenty percent
数词专项基础练习篇
( )1.The apartment has______floors and Mr.Smith lives on the ______floor with his family.
A.twelfth,twelve B.twelve,twelve C.twelve,twelfth
( ) 2.Last week,________students took part in the sports meeting in the city bowl(体育场).
A.three thousands B.three -thousands C.three thousand
( ) 3.Crystal and Catherine are good friends.They are in_______.
A.Class Three,Grade Nine B.Nine Grade,Three Class C.Grade Nine,Class Three
( ) 4.He has failed______times,but he won't give up any chance.He will try a time.
A.third,four B.three,fourth C.third,fourth
( )5.—How old is your son —______.We had a special party for his ______birthday yesterday.
A.Nine,ninth B.Ninth,nine C.Ninth,ninth
( ) 6.About______of the engineers in this computer company(公司) are men.
A.third fifths B.third fifth C.three fifths
( )7.Each year,______fish are killed by the polluted lakes and rivers.
A.million of B.seven millions C.millions of
( )8.After asking three times,I wonder if I can ask him_______time.
A.four B.a fourth C.the fourth
( )9.Li Ping will be______next month.Let's give a big surprise to her.
A.fifteenth B.fifteen C.the fifteenth
( )10.______is Teachers' Day.Teachers are like our parents.
A.September ten B.the ten of September C.September the tenth
( )11.This room is______the size of that one.
A.five time B.five times C.fifth time
( )12.—How long did it take you to get there —______.
A.Two and half hours B.Two hour and a half C.Two and a half hours
( )13.—Welcome to Los Angeles.Have you ever been here before
—Sure.I visited this city three years ago so this is my______time here
A.first B.second C.third
( )14.This is my cousin's______birthday.I'm going to his birthday party tonight.
A.nineteen B.the nineteenth C.nineteenth
( )15.______is easy for girls to learn,but hard for boys.
A.Lesson Three B.Lesson the third C.Three Lesson
( )16.When Newton was______,he became a successful scientist.
A.in his twentieth B.in his twenties C.in his twenty
( )17.______of the population in that country are farmers and workers.They produce too much for the society.
A.Two third B.Two threes C.Two thirds
( )18.I’m No.______on the school team.These are my sports suits.
A.Nine B.the Ninth C.Ninth
( )19.Unluckily,_______people died during the earthquake.That was too terrible.
A.two hundreds B.two hundred of C.two hundred
( )20.—Next Sunday is my grandpa's________birthday.—Really I wish him good health.
A.ninetieth -two B.ninety-two B.ninety -second
( )21.______of the students prefer listening to music and watching videos.
A.Two hundreds B.Two -hundred C.Two hundred
( )22.My aunt looks young.It's hard to imagine she is already in her______.
A.forties B.forty C.fortieth
( )23.The volunteers sent______books to a mountain village school on Children's Day.
A.two hundreds of B.two hundreds C.two hundred
( )24.Both of the rulers are broken.I want to buy a__________one.
A.three B.third C.fourth
( )25.It will take_______time to finish the work.
A.one and a half years' B.a year and half C.one and a half year's
数词专项中考链接提高篇
( )1.—In the______, China had rapid development in technology and trade.
—Yeah,Chinese people began to be rich.
A.nineteen ninety B.nineteen nineties C.nineteenth ninety
( )2.Our school has sent______books to the poor kids in the faraway villages.
A.five -thousand B.five thousands C.five thousand
( )3.—Hi,Mark.How about playing soccer after school
—I’d love to,but its my grandmother's___________birthday and we'll have a celebration.
A.ninetith B.nintieth C.ninetieth
( )4.—_____people watched the rocket flying up into the sky.—That was so great!
A.Ten thousands B.Ten thousands of C.Thousands of
( )5.—I always remember the first day of_______grade as if it happened yesterday.
—Yeah,time flies so fast!
A.the sixth B.six C.sixth
( )6.—I failed the basketball match three times.
—Why not try______time The willing to win is better than anything else.
A.a four B.the fourth C.a fourth
( )7.________the students in our school are girl students.Most of them are from the countryside.
A.Three hundreds B.Three hundreds of C.Three hundred of
( )8._________of the land was covered with sand 30 years ago,but now some of it has been tuned into oasis(绿洲).
A.Three fifths B.Three fives C.Three fifthes
( )9.Bill Gates became the richest man in the world in his______.Unlike others,he gave away almost all of his money to charity(慈善).
A.thirties B.thirty C.thirtieth
( )10.—The_______lesson in the text is hard to learn.
—Really I feel like reading it right away.
A.twenty -eight B.twenty -eighth C.twentieth -eighth
( )11.Please tum to Page______and take a look at the picture.
A.the seventieth B.Seventieth C.Seventy
( )12.______of the coats______made of cotton.They feel comfortable.
A.Two thirds,is B.Two thirds,are C.Two third,are
( )13.Learning_ well can improve the course(方式)of your mind and build yourself -confidence.
A.first a language B.the third languages C.a second language
( )14.When night comes,______of the old people in my neighborhood are used to dancing on the square.
A.two thirds B.two thin C.two threes
( )15.Our hometown attracts(吸引)__________tourists from home and abroad to enjoy ice and snow every year.
A.five millions B.five millions of C.millions of
( )16.—The wise man will return in______.
—Oh,my God.Ill have to wait for him to come back.
A.one or two weeks B.one and two weeks C.one or two week
( )17.—We are in the_______century.We should face up to all challenges.
—That's right.A brave heart brings success.
A.twenty-first B.twenty -one C.twentieth -one
( )18.The Causeway nuns for_________miles.It ends on the eastern coast of Northern Ire-land.
A.hundred B.hundreds of C.hundreds
( )19.Now children,turn to Page ______and look at the______picture in Lesson Two.
A.Twentieth,one B.Twenty,one C.Twenty,first
( )20.—When do we have the IT class
—At______.
A.forty to ten B.forty past ten C.ten forty
( )21.It's never too old to learn.Karl Marx began to learn English in his ________.
A.the fiftieth B.fifty C.fifties
( )22.______of the earth's surface is covered with water.We call our planet a watery ball.
A.Three -quarter B.Three quarter C.Three quarters
( )23.I have only one pen and I am going to buy_______one.
A.the second B.second C.a second
( )24.________of us failed the test because we hadn't had enough preparations.
A.Thirty percent B.Thirty-percents C.Thirty percents
( )25.—What's the time by your watch —It's______.Let's take a short break,
A.ten to ten B.ten to ten o'clock C.ten fifteenth