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初一数词讲解

初一数词讲解
初一数词讲解

数词

?数词是表示数目多少或顺序先后的词。数词与不定代词很相似,其用法相当于名词与形容词。

数词有两种:表示数目多少的数词叫做基数词,表示顺序先后的数词叫做序数词。

基数词的构成

? 1—12的基数词

? 13—19均由3—9加后缀-teen构成

(注意thirteen,fifteen,eighteen的拼法)

? 13 thirteen 17 seventeen 14 fourteen 18 eighteen 15 fifteen 19 nineteen16 sixteen ? 20—90等十位数均由2—9加后缀-ty构成

(注意twenty,thirty,forty,fifty,eighty的拼法)

? 20 twenty 60 sixty 30 thirty 70 seventy 40 forty 80 eighty 50 fifty 90 ninety ? 21—29由十位数20加个位数1—9构成,中间须有连字符“-”,其他十位数依此类推。

? 21 twenty-one 31 thirty-one 22 twenty-two 42 forty-two

23 twenty-three 53 fifty-three 24 twenty-four 64 sixty-four

25 twenty-five 75 seventy-five 26 twenty-six 86 eighty-six

27 twenty-seven 97 ninety-seven 28 twenty-eight 29 twenty-nine

?百位数由1—9加hundred构成,如包含十位数及个位数,中间用and连接,也可以不用;如只包含个位数,即十位数为零时,则and不可省。

? 100 a/one hundred 200 two hundred

706 seven hundred and six 125 a/one hundred (and) twenty-five

341 three hundred (and) forty-one 987 nine hundred (and) eighty-seven

?英语中从1100—1900之间的整数常用hundred表示。

? 1100 eleven hundred 1500 fifteen hundred 1900 nineteen hundred

?千位数由1—9加thousand构成,百位数前不加and,其后的十、个位数构成方法同前。

? 1000 a/one thousand

2000 two thousand 3000 three thousand

5700 five thousand seven hundred 6900 six thousand nine hundred

1248 a/one thousand two hundred (and) forty-eight 3133 three thousand one hundred (and) thirty-three (此处hundred之前不可用a)

?英语里没有“万”这一单位,万也用thousand表示。

? 10,000 ten thousand 20,000 twenty thousand

?百万的说法

? 1,000,000 a (one) million

2,000,000 two million

3,000,000 three million

?千万的说法

? 6千万 sixty million

5亿 five hundred million

80亿 eight thousand million (等于美国英语eight billion)

3百亿 thirty thousand million(等于美国英语thirty billion)

1千亿 a/one hundred thousand million(等于美国英语a/one hundred -billion)

基数词的用法

?基数词相当于名词,可有复数形式,其构成方法及读音与名词相同。

a man in his fifties 50多岁的男人

? hundred,thousand,million表示不确定数目时,须用复数形式,常后接of短语。如意义清楚时,其后的of短语可省去。

? His coat is worth hundreds of dollars.他的大衣值好几百美元。

Thousands of people observed the ship leaving the harbour.数以千计的人观看了轮船离港的情形。

Hundreds of thousands are homeless. 几十万人无家可归。

? hundred,thousand,million,billion等词前有具体数词或several时,须用单数。

? There are three hundred and sixty-five students in this school.这所学校有365个学生。

? dozen(十二)和score(二十)等表示数字的词也按以上规则处理。

? I have told you dozens of times. 我已跟你说过几十次了。

Dozens of police arrived as the hoodlums closed in on him.几个恶棍逐渐将他团团围住时,几十个警察到了。

I bought two dozen bottles of wine.我买了24瓶酒。

I walked several score of miles.我走了好几十英里。

?表示“几十年代”或“几十岁”时,用逢十的基数词的复数。

? During the seventies,her acting career was in eclipse.在70年代,她的表演生涯黯然失色。

He was somewhere in his sixties.他大约60岁了。

?与基数词合成的复合定语,其中的名词用单数。

? The five-year-old boy can dress himself.那个5岁的孩子自己能穿衣服了。

My teacher is a seventy-year-old woman.我的老师是一位70岁的老妇人。

序数词的构成

? 1—19的序数词

? 1st first 11th eleventh

2nd second 12th twelfth (twelf加th) 3rd third 13th thirteenth

4th fourth 14th fourteenth 5th fifth 15th fifteenth(fif加th)

6th sixth 16th sixteenth 7th seventh 17th seventeenth

8th eighth 18th eighteenth(eight后只加h) 9th ninth 19th nineteenth(nin加th) 10th tenth

?整位数的序数词的构成方法是:先将十位数的基数词的词尾-ty中的y变为i,然后加后缀-eth。

? 20th twentieth

30th thirtieth 40th fortieth 50th fiftieth 60th sixtieth

70th seventieth 80th eightieth 90th nintieth

?十位数的序数词如包含1—9的个位数时,十位数用基数词,个位数用序数词,中间须有连字符“-”。

? 21st twenty-first 32nd thirty-second

43rd forty-third 54th fifty-fourth

65th sixty-fifth 76th seventy-sixth

87th eighty-seventh 98th ninty-eighth

?多位数序数词的后位数如包含1—9时,后位数用序数词,前位数用基数词,中间出现零时,须用and连接。

? 201st two hundred and first

?注意:序数词亦可有复数形式,其构成方法及读音与名词相同。

分数表示法

?分子须用基数词,分母用序数词。分子如是1以上的基数词,分母须用复数形式。

? 1/3 读作a/one third 3/4 读作three quarters 或three fourths 1/2 须读作a/one half

不读作one second

?数学中可都用基数词读。

? 1/2 读作one over two

2/3 读作two over three 3/4 读作three over four 11/20 读作eleven over twenty

27/253 读作twenty-seven over two

hundred (and) fifty-three

?整数与分数之间须用and连接。 5(1/2) 读作five and a half

7(5/6) 读作seven and five sixths

?分子与分母之间还可加in或out of,分子在前,分母在后,分子分母都用基数词。

? 1/10 one in ten

4/5 four in five

1/10 one out of ten

小数表示法

?小数点前的基数词与前面所讲的基数词读法完全相同,小数点后则须将数字一一读出。

? 1.25 读作one point two five

3.745 读作three point seven four five

百分数表示法

?百分数的读法是直接将数词放在百分号(%)前,百分号读作percent。

? 0.5% 读作 (nought) point five percent

5% 读作five percent

20% 读作 twenty percent

300% 读作three hundred percent

?表示百分数直接将数词放在单词percent前面

? thirty percent 30% sixty-five percent 65%

算式表示法

? 3+2=5 读作Three plus two equal(s) five.

或Three and two are five.

10-2=8 读作Ten minus two is eight.

或Two from ten leaves eight.

9×6=54读作Nine multiplied by six is fifty-four.

或Nine sixes are fifty-four.

或Nine times six is fifty-four.

20÷10=2读作Twenty divided by ten is two.

或Ten into twenty goes two.

3∶2读作the ratio of three to two

12∶3=4读作The ratio of twelve to three equals four.

32读作three squared

33=27 读作Three cubed is twenty-seven.

X4=Y 读作The fourth power of X is Y.

=3 读作The square root of nine is three.

=3 读作The cubic root of twenty-seven is three.

?表示3以上的倍数用times,但表示两倍时用twice。

? Three times six is eighteen.三乘六等于十八。

Twice two is four.二二得四。

?倍数用在形容词原级比较的第一个as前面。

? I have twice as many books as you do. 我的书是你的书的两倍。

The dining room was twice as big as the Tom's.这个餐厅是汤姆的餐厅的一倍大。This substance reacts four times as fast as that one.这种物质的反应速度是那种物质的4倍。

?倍数+the+度量名词+of+比较对象

? We were opposed by a force twice the size of our own.我们遭到了比我们多一倍兵力的抵抗。

The earth is 49 times the size of the moon. 地球是月球的49倍大。

?倍数+形容词/副词比较级+than+比较对象

? This building is twice higher than that one. 这栋建筑物比那栋高两倍。

This room is four times larger than that one.这个房间比那个房间大三倍。

?形容词/副词比较级+than+...+by+倍数

? We produced more cars in 2000 than those in 1999 by twice. 我们2000年生产的小汽车是1999年的两倍。

?倍数+what引导的从句

? The length of the road is five times what it was ten years ago. 公路的长度是10年前的5倍。

The industrial output in the factory is more than three times what it was in 1990.这家工厂的工业产量是1990年的3倍多。

?表示倍数也可用again,double等词。

? My uncle is as old again as I am. 我叔叔的年龄比我大一倍。

This shirt cost me as much again as the last one I bought.这件衬衫比我上次买的那件贵一倍。

I have books as many again as you.我的书比你的多一倍。

The total output is double that of last year.总产量是去年的两倍。

It is more than double the 1986 figure.这个数字是1986年的两倍多。

The top-brand cigarettes are often sold at double the normal price here. 在这里名牌香烟的售价经常比正常高一倍。

?表示增加多少倍可用百分比,也可用times或fold,如用times与fold,则须注意英语要多说一倍。

? Population has increased by 300% in the past 30 years. 人口在过去30年内增加了300%。

Output of coal was four times as great as that of last year.煤产量比去年增加了3倍。

大约数表示法

?用ten,dozen,score,hundred,thousand,million等数词的复数加of短语来表示几十、几百、上千、成千上万、几百万等大约数概念。

? Tens of thousands of people have been forced to abandon their homes and native villages since the warbroke out.自从这场战争爆发以来,几万人被迫背井离乡。

Life began on Earth millions of years ago.地球上的生命始于数百万年以前。

?用more than,over,beyond,above,more等来表示多于某个数目。

? In the city,more than 30,000 people marched protesting violence.在那个城市,有三万多人游行抗议暴力。

He has bought over thirty books just during this week.就在这周内他已买了30多本书。

There weren't beyond twenty people present.出席的人不超过20名。

This machine weighs above three tons.这部机器的重量超过三吨。

Fifty percent or more of the population there is illiterate.那里50%或更多的群众是文盲。

?用less than,under,below,nearly,up to等来表示小于或接近某数目。

? Angles of less than 90 degrees are called acute angles.小于90度的角叫锐角。He can not be under thirty years of age.他的年龄不会小于30岁。

He attached himself to the university where he worked nearly thirty years.他对那所大学依依不舍,因为他在那里工作了差不多30年。

He drove faster,watching the needle flick up to a hundred km.他把车越开越快,看着车速表上的指针跳到了100公里。

?用about,around,more or less,or,or so,some等表示在某数目左右。

? He died about three years ago.他大约在三年前就死了。

I'll be back at around 5 o'clock.5点左右我就回来。

It took more or less a whole day to paint the ceiling.粉刷天花板用了将近一整天的时间。

The doctor spent four or five hours performing the operation.那医生花了四五个小时做这个手术。

His weight is seventy kilos or so.他的体重大约70千克。

He waited some 30 minutes.他等了大约30分钟。

?用to,from...to,between...and表示介于两数目之间。

? I will be back in two to three weeks. 我两到三周后就回来。

There were from 60 to 80 people present.出席的人数在60到80人之间。

I will come between seven and eight o'clock.我会在7点至8点之间来。

年月日表示法

?表示年代、世纪。

? 21世纪the 21st century

the twenty-first century

20世纪80年代1980s/1980's 读作 the nineteen

eighties

60年代the sixties

?表示年份用基数词,先读前一位或两位数,再读后两位数。

?公元前350年350 B.C. 读作three fifty B.C.

或three hundred

and fifty B.C.

1900年1900 读作nineteen hundred

2001年2001 读作two thousand and one

?表示月份,首字母须大写,书写时可用缩写形式。

? 1月 January (Jan.) 7月 July (Jul.)

2月 February (Feb.) 8月 August (Aug.)

3月 March (Mar.) 9月 September (Sept.)

4月 April (Apr.) 10月 October (Oct.)

5月 May 11月 November (Nov.)

6月 June (Jun.) 12月 December (Dec.)

?表示年、月、日时,“年”用基数词,“日”用序数词。

? 1949年5月4日写作May 4,1949

读作May the

fourth,nineteen

forty-nine

或the fourth of May

nine-teen forty-nine

时刻表示法

?表示整点,用基数词加o'clock构成,o'clock也可省略,介词用at。

?9∶00读作nine o'clock (或nine)

Church begins at nine (o'clock).礼拜仪式九点开始。

?表示“几点过几分”,用past,但分钟数必须在半小时以内(包括半小时)。

?9∶05读作five past nine

或nine five

9∶15读作fifteen past nine

或 a quarter past nine

或nine fifteen

9∶30读作half past nine

或nine thirty

?表示“几点差几分”,用介词to,但分数必须在半小时以上(不包括半小时)。

?9∶40读作twenty to ten

或nine forty

9∶45读作fifteen to ten

或 a quarter to ten

或nine forty-five

9∶55读作five to ten

或nine fifty-five

? am,pm要与表示时间的数字连用,置于数字之后。相应的短语有时可置于名词前作定语。? He checked off at 5 pm.他下午5点钟下班。

Office hours are from 9 am to 5 pm.办公时间从上午9点到下午5点。

The 8 am train from London arrived at the station.上午8点从伦敦开来的列车进站了。?注意:

①am,pm不能单独使用。

②am,pm不可与o'clock连用。

③am,pm不可与in the morning,in the afternoon连用,以免重复。第四章介词第四章介词

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