中考英语总动员不可忽略的数词
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中考英语总动员:不行忽视的数词
英语中的数词包含基数词和序数词两大类,它们的用法特别复杂,为了便于同
学们系统地复习数词,现就初中阶段数词的主要内容作以下概括。
一、基本组成
(一)基数词——从1数到N
1.1— 12的基数词是独立的单词,即: one, two ,three, four , five , six, seven,eight, nine ,ten, eleven, twelve.
2.13— 19的基数词以 -teen 结尾。
如: fourteen, seventeen 等,但 13, 15, 18较
特别, 13— thirteen 15 — fifteen 18 —eighteen.
3.20— 90的整十位均以 -ty 结尾。
如: sixty , ninety ,但 20, 30, 40, 50,80较特殊, 20— twenty , 30— thirty , 40— forty , 50—fifty,80—eighty.
4.十位数与个位数之间要加连字符号“-”,如:28—twenty-eight,96—ninety-six.
5.百位和十位(若无十位则和个位)之间加and,如: 148— one hundred and
forty-eight,406—four hundred and six.
6.hundred(百),thousand(千),million (百万),billion (十亿)等前方即便有
详细的数词,也不可以在它们的后边加s.如: 600— six hundred, 8百万— eight million.
7.1000以上的数字,从后往前数每三位加一个逗号“,”第一个逗号前为千(thousand),第二个逗号前为百万( million ),第三个逗号前为 billion (十亿)。
英语中无“万”这个词,我们能够用“几十个千( thousand)”表示几万,“几百个千( thousand)”表示“几
十万”。
如: 2,510= two thousand five hundred and ten ;84,296= eighty-four
thousand two hundred and ninety-six ;274,350= two hundred and seventy-four thousand three hundred and fifty.
8.hundred, thousand,million用复数形式修饰名词时要用“of+复数名词”,如:数以百计的年青人hundreds of young people ;成百上千的书thousands of books.注意:
hundreds of / thousands of/millions of +复数名词,其前方不可以加详细的数词,但
可加 several 或 many.
Hundreds of new buildings have sprung up here this year.
Thousands upon thousands of people in South Africa are rising against
their oppressors.
Thousands and thousands of people come to visit the city every day.
Millions of dollars have gone into the building of this factory.
(二)序数词——由基数词转变而来,表示“这是第N个”
1.口诀巧记基数词变序数词:“一、二、三,特别记,八去‘,t’九去‘e,’‘ve要’用
‘替f’,见‘ y变’成‘和i’‘,e’词尾加上‘ th,’假如碰到几十几,只变个位就能够。
”
第一、第二、第三分别: first , second, third , eight — eighth nine — ninth, five — fifth ,
twelve — twelfth , twenty — twentieth , forty —fortieth , twenty-five — twenty-fifth.
2其他状况均在基数词后加th.如: six — sixth , nineteen— nineteenth ,hundred—hundredth, thousand— thousandth 等。
3.序数词有时用缩写形式:
first —— 1st, twenty — second—— 22th.
二、数词基本用法
(一)基数词的基本用法
1.定语
Fifty thousand London dockers are out on strike.
2.主语
数词作主语,谓语动词用单数。
如:Two months is quite a long time.
Five is an odd number.
3.宾语或介词宾语
How many do you want ?—— Eight , please.
The city has a population of four million.
4.表语
We are altogether fourteen.
Five plus seven is twelve.
5.同位语
What work are you to assign us three ?
Is there room for us two ?
6.基数词+单数名词+形容词组成合成形容词。
如:一个五岁的男孩a
five-year-old boy ;一座 800米长的桥 an 800-metre-long bridge ;女子 400米接力
girls ‘-400metre relay race.
7.句型:主语+ is + about(大概)/ over = more than(超出)/ nearly(靠近)+详细数词+ metre( s)/ kilometre ( s)/ kilo ( s) long / high / tall / deep / away 等。
如:长江长 6300公里。
The Changjiang River is 6 , 300 kilometres long.
8.表示“ 十”的数词的复数形式能够用来表示人的年纪或年代:
He is in his early thirties.
He died still in his forties.This took place in the 1930s.
(二)序数词的基本用法
1.序数词主要用作定语,前方一般要加定冠词(或物主代词):Tom is their second son.
They celebrated the 10th anniversary of the founding of the republic.
I will never give up , not even on the 1, 000th or 10 , 000th try.
2.有时前方能够加一个不定冠词来表示“再一”,“又一”这样的意思:We‘ll have to do it a second time.
Shall I ask him a third time ?
When I sat down , a fourth man rose to speak.
3.First, second 等有时可用来表示“第一个人(批)”“第二个人”等:She was among the first to come and settle in Dujiashan.
You will be the second to speak.
4.假如数字较长,序数词总防止使用,并且读的方法也经常简化:
第201房间: Room 201
第319面: page 319
第一拖沓机厂:the Number I Tractor Works
第六号车厢: Carriage No.6
南京路 1490号: 1490 Nanjing Road
电话号码 55―― 2347 : telephone number : 55— 2347
5.在谈编了号的东西时,我们能够用基数词表示次序:
the first part —— part one
the third squad—— squad three
the twenty-third section —— section twenty-three
三、特别数字的表示法
(一)年月日表示法
1.年代年代前用in.
(in ) 897 读作( in) eight hundred and ninety-seven
( in )1961 读作( in) nineteen sixty-one (或in nineteen hundred and sixty-one )(in ) 1905 读作( in) nineteen and five
(in ) 1800 读作( in) eighteen hundred
2.月份月份开头第一个字母须大写,表示“在某月”时,月份前方用 in.下边月份后
附有缩写式。
(in ) January Jan.( in) March Mar. ( in) December Dec.
3.日期用序数词(前需要加the)表示;“在某日”,前方用介词on.
(o n) the first ( on) the eighteenth( on) the thirty-
second 4.某年某月某日
in Sep.1954 on May 17 ,1960 on Oct.1 ,1949(读作 on October the first , nineteen forty-nine )
注:当年代日完整用数字表示时,美国人把月放在日前。
8, 6, 79在英国表示June the eighth ( 79年 6月 8日),可是在美国却表示 August the sixth(79年8月6日)。
(二)时辰表示法
1.英语往常用at 所指引的表示时辰。
如:
(at) six or six o‘clock
(at) eight or eight o‘clock
2.如说几点几分,用下边的方法
a)表示几点过几分,用介词,但分数须在半小时之内包含半小时。
如:
eleven past seven
a quarter past eight
half past nine
b)表示几点差几分,用介词to,但分数需要在半小时以上不包含半小时。
如:two to seven
a quarter to eight
eighteen to nine
注:上午能够用am 表示,下午用pm 表示,比如:
9.50am 11.05pm
(三)分数词表示法
1.分数词是以基数词和序数词合成的,基数词代表分子,序数词代表分母,除了分子是“1”状况外,序数词都是用复数,的(分子用基数词,分母用序数词,分子
大于“1,”分母则加“s)”如:
1/4 one-fourth 2/3 two-thirds 7/9 seven-ninths 5/12 five-twelfths
2.此外还有下边一些表示法:
1/2 (one) a half 1/4 a ( one ) quarter 3/4 three-quarters
(四)小数的表示法
7.8 —— seven point eight
0.4—— zero point four
0.125—— zero point one two five
603.09—— six hundred and three point oh nine
小数作定语时许多:
Its total industrial output value was up 5.6 times in these years.
Our grain output is now 2.4 times that of 1970.
(五)百分数的表示法
百分数由per cent 表示,经常和by 连用,作状语也可独自作状语:
Its total output value increased by 11.5 per cent over the previous year.
The output of cars in the st year was 24 per cent less than in 1973.
有时用作定语宾语等:
The loss of metal has been reduced to less than 20%.
The March figure for output value registered a 37% increase over February.(六)倍数的表示法:
一倍用 once,两倍用twice ,两倍以上用基数词+times.如: 5倍 five times.(七)一些数学公式的读法:
9-7=2 Nine minus seven is two.
a>b a is more than b.
(八)约数的表示法
⑴ “多于”用 more than 或 over
This room can hold more than ( =over) 500 people.这间房屋能容纳
500多
人。
⑵ “少于”用 less than
There are less than thirty balls in the basket. 篮子里不到三十个球。
⑶ “或以上”用or more
The music hall can hold 7000 people or more. 音乐厅能容纳 7000人或 7000 人以上。
⑷ “或以下”用or less
The house can hold 50 people or less.这座房屋可容纳50人或 50人以下。
⑸ “大概”用 about, around, nearly 等
The box weights about 50 pounds. 这个箱子重约 50磅。
⑹ “左右”用 or so
In the past ten years or so , they have changed a lot.在过去的十年左右的时间里,他们改变了很多。
3+8=11 Three plus eight is eleven.。