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初中英语数词教案

初中英语数词教案
初中英语数词教案

数词

1. 基数词

表示数目的词称为基数词。其形式如下:

A.从1——10

one,two,three,four,five,six,seven,eight,nine,ten.

B.从11——19

eleven,twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,nineteen.

这里除eleven,twelve,thirteen,fifteen,eighteen为特殊形式外,fourteen,sixteen,seventeen,nineteen都是由其个位数形式后添加后缀-teen构成。

C.从21——99

整数几十中除twenty,thirty, forty,fifty,eighty为特殊形式外,sixty,seventy,ninety都是其个位数形式后添加后缀-ty构成。表示几十几时,在几十和个位基数词形式之间添加连字符“-”

21 twenty-one 76 seventy-six

D.百位数

个数基数词形式加“hundred”,表示几百,在几十几与百位间加上and.

101 a hundred and one 320 three hundred and twenty 648 six hundred and forty-eight

E.千位数以上

2,648 two thousand six hundred and forty-eight

F.hundreds of 数百thousands of 数千比如There are hundreds of people in the hall.大厅里有数以百计的人。

G.表示人的不确切岁数或年代,用几十的复数形式表示。

He became a professor in his thirties.

他三十多岁时成为了教授。

1) 序数词第一、第二和第三为first,second和third,其他序数词的构成是在基数词后加th。例如:

six→sixth seven→seventh ten→tenth four→fourth

2) five------fifth(第五)、eight------eigth (第八)、nine-------ninth (第九)和twelf-----twelfth (第十二)

3) 二十、三十等基数词变为序数词时,要把y变成ie再加-th。例如:

twenty→twentieth forty→fortieth

4) 基数词几十几变成序数词时,表示几十的数词不变,只把表示几的基数词变成序数词。例如:

twenty-one→twenty-first forty-five→forty-fifth

5) 第一百、第一千、第一百万、第十亿都是在基数词后直接加th构成。例如:

hundred→hundredth第一百thousand→thousandth第一千

6).序数词的缩略形式是由阿拉伯数字加序数词的最后两个字母构成。例如:

1st,2nd,3rd,4th,21st,32nd,40th

序数词前面要加定冠词the。例如the first time

时刻表示法

1. 表示几点钟用基数词加可以省略的o`clock 5:00 读作five o`clock 或five

2. 表示几点过几分,在分钟后加past,再加小时five past seven 七点过五分half past six 六点半a quarter past eight 八点过一刻

3. 表示几点差几分,在分钟后面加to,再加小时ten to eight 差十分八点(七点五十分) a quarter to twelve 差一刻十二点(十一点四十五分)twenty to six 差二十分六点(五点四十分)

在日常生活中,常用下列简单方法表示时间。

以小时、分种为单位分别读出数字。

6:31读作six thirty-one 14:03 读作fourteen o three 23:55 读作twenty-three fifty-five

注:时刻表上的时间大多采用24小时表示法,这样就不需要用a.m.表示上午,p.m.表示下午了。

年代用定冠词及基数词表示的世纪加十位整数的复数形式构成

in the 1930`s(in the thirties of the twentieth century或in the nineteen thirties)在二十世纪三十年代

in the 1860`s(in the sixties of the 19th century或in the eighteen sixties)

由数词和其他名词构成的名词性短语作定语时,其中的名词用单数形式,名词性短语中各部分间要用连字符“-”来连接。

She’s a sixteen-year-old girl.

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