初中英语语法大全:数词

所属专题:2015年中考英语  来源:互联网    要点:初中英语语法大全  
编辑点评: 表示数目多少或顺序多少的词叫数词,数词分为基数词和序数词。表示数目多少的数词叫基数词;表示顺序的数词叫序数词。

II 序数词

1.序数词的构成
(1)一般在基数词后加th
 eg.four→fourth,thirteen→thirteenth
(2)不规则变化
one→first, two→second, three→third, five→fifth,eight→eighth,
nine→ninth,twelve——twelfth
(3)以y结尾的十位整数,变y为ie再加th
 twenty→twentieth, forty→fortieth, ninety→ninetieth
(4)从二十一后的“几十几”直至“几百几十几”或“几千几百几十几”只将个位的基数词变为序数词。
twenty-first,two hundred and forty-fifth

2.序数词的用法

(1)序数词作定语时,一般要与定冠词或物主代词连用。
eg.Tom is their second son.
He is the first one to come here.
(2)序数词有时可与不定冠词连用,表示数量上“又—”,“再一”
eg: He tried a second time.他又试了—次。
Shall l ask him a third time?还要我再问他—次吗?我已问了他两次)
(3)序数词的缩写形式为:阿拉伯数字加上这个词的末尾两个字母。
1st 2nd,3rd,4th,20th,21st,22nd,23rd
(4)表示年、月、日时,年用基数词,日用序数词。
2005年8月15日:(英)15,8,2005=15th,August,2005;(美)8,15,2005=August 15th,2005

III基数词和序数词都可以用来给数字编号

The first lesson=Lesson Two(第二课)

第305房间:Room three o(零)five
长安街76号:seventy-six Changan Street
电话号码:204-2244:telephone number two o(零) four two two(double two four four
十一路公共汽车:Bus(No.) eleven

IV分数词的表达

分子用基数词,分母用序数词,分子大于1时,分母加s

 eg.1/3-one third;2/5-two fifths

V数学运算的表达

eg.3+5=8 Three plus/and five is eight.
9-2=7 Nine minus two is seven.
6x5=30 Five times six is thirty /six unutilized five is thirty.
8÷2=4 Eight divided by two is four.

VI倍数表示法

a. 主语+谓语+倍数(或分数)+ as + adj. + as
I have three times as many as you. 我有你三倍那么多。
b. 主语+谓语+倍数(分数)+ the size (amount,length…) of…
The earth is 49 times the size of the moon. 地球是月球的49倍。
c. 主语+谓语+倍数(分数)+ 形容词(副词)比较级+ than…
The grain output is 8 percent higher this year than that of last year.
今年比去年粮食产量增加8%。
d. 还可以用by+倍数,表示增加多少倍
The production of grain has been increased by four times this year.
今年粮食产量增加了4倍。

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