2017中考指导:初中英语语法大全之数词

2016-08-24 17:06:14来源:网络

  (8)在一些表示“一排”或“一组”的词组里;

  eg,They arrived in two sand threes.他们三三两两地来了。

  (9)表示“…十”的数词的复数可以表示人的岁数或年代。

  eg. He is in his early thirties.他有三十来岁(31—34岁):

  This took place in the 1930s.这事发生在二十世纪三十年代;

  (10)表示时刻

  钟点表达法。

  顺读法(钟点+分钟) 如:4:30 four thirty 4:45 four forty-five 4:15 four fifteen 倒读法(分钟+to/past+钟点)

  如:4:30 half past four

  4:15 fifteen past four/a quarter past four 4:45 fifteen to five/a quarter to five

  eg.I watch CCTV News at seven o’clock every evening.

  (11)表示百分数

  百分数的表达方式是:基数词+ percent(单数形式)+of+名词。如:

  Thirty percent of the students in my class are from cities. 我班30%的学生来自城市。

  About 61 percent of the surface is covered by water. 大约61%的表面被水覆盖着。

  (12)小数的读法:小数点读作"point",小数后各位数要分别读, 小数点前的数若为"0"可略去不读。

  Examples: 2.468 读作:two point four six eight

  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.

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