Page 97 - 五点英语

第一部分 考点梳理

第十节 数词和名词所有格

一、数词

数词分为基数词（表示量的多少）和序数词（表示量的顺序）。
1. 基变序口诀：基变序，从四起，序后th来帮助。

123，特殊记；“ve”要用“f”替，five，twelve是兄弟；“8”少“t”，“9”去“e”；遇y结尾变ie；遇
到几十几，只变个位就可以。

数字 基数词 序数词 数字 基数词 序数词

1 one first 13 thirteen thirteenth
2 two second 14 fourteen fourteenth
3 three third 15 fifteen fifteenth

4 four fourth 16 sixteen sixteenth

5 five fifth 17 seventeen seventeenth
6 six sixth 18 eighteen eighteenth
7 seven seventh 19 nineteen nineteenth

8 eight eighth
9 nine ninth 21 twenty-one twenty-first

10 ten tenth 22 twenty-two twenty-second
11 eleven eleventh 23 twenty-three twenty-third

12 twelve twelfth 24 twenty-four twenty-fourth

数字 基数词 序数词 缩略式 数字 基数词 序数词 缩略式

20 twenty twentieth 20th 70 seventy seventieth 70th

30 thirty thirtieth 30th 80 eighty eightieth 80th
40 forty fortieth 40th 90 ninety ninetieth 90th

50 fifty fiftieth 50th
60 sixty sixtieth 60th

2. 易错易混点：
twenty-four—twenty-fourth (遇到几十几，只变个位就可以)
two hundred and fifty-one—two hundred and fifty-first
序数词用法：①放在定冠词the之后表特指；

②前面有名词所有格、形容词性物主代词时，不再使用“the”。
eg: Mr. Liu is a famous writer in the (特指) (twenty-one) century.
Nick gave his mother a scarf on her (泛指) (forty) birthday. That made her very happy.

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