每日英语任务英语语法之数词详解
每日英语任务英语语法之数词详解成人英语学位必过
数词,表示多少或顺序先后的词叫做数词,其中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
基数词的基本形式
1one 11eleven 20twenty 100 a(one)hundred
2two 12twelve 30thirty 1000 a(one) thousand
3three 13thirteen 40forty 1000000 a(one)million
4four 14fourteen 50fifty
5five 15fifteen 60sixty
6six 16sixteen 70seventy
7seven 17seventeen 80eighty
8eight 18eighteen 90ninety
9nine 19nineteen
10ten
其他基数词形式
1.二位数在十位和个位之间加连接符”-“ 34 thirty-four 89 eighty-nine
2.三位数在百位和十位(或各位)之间加and 127 one hundred and twenty-seven 506 five hundred and six
3.英语中,一千以上的阿拉伯数字从后向前三位的地方,即千位之后、百万位数之后加上”,“
45,208 forty-five thousand, two hundred and eight
671,100 six hundred and seventy-one thousand,one hundred
注意:hundred,thousand,millien 作定语时一律没有复数形式,但作名词用,后面跟“of 短语” 时 则必须用复数
two hundred students 二百个学生 five thousand books 五千本书 three million people 三百万人
基数词有时也可以由复数形式
five threes 五个三 in twos and threes 三三两两 a person in his fifties 五十多岁的人
in the mid forties 四十年的中期
基数词的用法
基数词兼有名词和形容词的作用,在句中可做主、宾、表、定和同位语。
Some people think that thirteen is an unlucky number (主语)
Give me five, please (表语)
序数词
序数词的构成
常见序数词 first second third fourth fifth sixth seventh eighth ninth tenth eleventh twelfth thirteenth
nineteenth twentieth fortieth fifty-fist sixty-second seventy-third eighty-fourth ninety-fifth
序数词一般以与之相应的基数词加词尾 -th构成,但也有特殊的变化形式;
1)第一至第十九:除一下基数词外,都在基数词后加-th构成序数词
first,second,third,fifth,eighth,ninth,twelfth
2)整数以 -ty 结尾的基数词,将y变为 i 再加 -eth 构成相应的序数词
twentieth , seventieth,ninetieth
3)第二十一至第九十九的序数词,十位数用基数词,个位数用序数词,十位和个位间用连字符
twenty-first eighty-fifth
4)hundred,thousand,million,billion等基数词加上 -th 即构成序数词,前面加相关基数词,”一“只可用one
one hundredth(第一百) ten thousandth (第一万) two billionth(第20亿)
5)多位数序数词的后位数包含1-9时,后位数用序数词,前位数用基数词,中间出现零时,需用and 连接
three hundred and eighth (第308) four thousand, three hundred and twenty-first(第4321)
6)序数词的缩写形式由阿拉伯数字加上最后两个字母组成 . 1st , 2nd , 3rd , 8th, 50th, 93rd, 361th
7)名词在前,数字在后,该数字要用基数词 Lesson 8, Bus No.89
分数词是以基数词和序数词合二为一构成的一种数词
1)基数词用以表示分子,序数词则表示分母,除分子’1‘的情况外,序数词都要用复数形式
1/5 one-fifth 2/9 two-ninths 2(3/4) two and three-fourths 1/100 one-a hundredth
2)另外一些表示法1/2 a(one) half 1/4 a(one) quarter 3/4 three-qurters 2(1/4) two and a quarter 1(1/2) one and a half
3)比较复杂的分数词,分子、分母都用基数词,先说分子,后说分母,中间用介词over
13/27 thirteen over twenty-seven 23/87 twenty-three over eighty-seven
小数用法
小数点前的基数词 与 前面所讲的 基数词读法相同,小数点读作point,小数点后的数字要一一读出。
1.27 one point two seven
0.702 zeo point seven zero two
小数在句中主要作定语
The number of the students now in our school is 2.3 times that of 1980
数词概念举报/反馈