【语法】数词语法精讲(序数词,分数,倍数)
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二、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 注意: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

三、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

四、倍数表示法 1.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。 2.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。 3.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%。 4.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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