序数词的用法--初中英语语法大全

序数词：表示顺序的数词叫序数词。

1、 英语的序数词基本变法：

(1) 一般在基数词后加th,(2)-ve结尾的改为-fth,(3)-ty结尾的改为-tieth,(4)熟记特殊词。

2、序数词如下：

1st

2nd

3rd

4th

5th

6th

7th

8th

9th

10th

11th

12th

※first

※second

※third

fourth

fifth

sixth

seventh

eighth

ninth

tenth

eleventh

twelfth

13th

14th

15th

16th

17th

18th

19th

thirteenth

fourteenth

fifteenth

sixteenth

seventeenth

eighteenth

nineteenth

20th

30th

40th

50th

60th

70th

80th

90th

100th

twentieth

thirtieth

fortieth

fiftieth

sixtieth

seventieth

eightieth

ninetieth

one undredth

21st

22nd

23rd

35th

101st

twenty-first

twenty-second

twenty-third

thirty-fifth

one hundred and first

1000thone thousandth, 1000000th one millionth., 第703the seven hundred and third,

第5480the five thousand four hundred and eightieth.

3、注：(1)两位以上的序数词仅个位数部分用序数词,其余部分仍用基数词。如：thirty-sixth,

(2) 使用序数词时一般加定冠词the. 如：i’m in the third grade.

(3) 序数词作“几分之几”讲时,有复数形式。如：1/5one fifth ; 2/3 two thirds ; 4/7 four sevenths ; 1/2 a half ; 1/4a quarter ; 3/4 three quarters ; 50% fifty hundredths ( fifty per cent).