初一英语词汇复习:数词小结
1.基数词
基数词相当于名词，在句中可做主语、表语、定语、状语等。如：
Three of my classmates are from Shanghai.
I am twenty this year.
They have four classes in the morning and three in the afternoon.
2.序数词
1)序数词的构成：
大多数的序数词是由基数词加-th构成。如：seven―seventh;ten―tenth
以-t结尾的基数词只在词尾加-h。如：eight―eighth
以-ve结尾的基数词改-ve为f再加-th。如：five―fifth;twelve―twelfth
以-y结尾的基数词改-y为-ie再加-th。如：twenty―twentieth，thirty―thirtieth
几十几的序数词只在个位数体现。如：twenty-one―twenty-first;thirty-three―thirty-third
特殊的序数词：
one―first;two―second;three―third; nine―ninth
2)序数词在句中同样可做主语、表语、定语、状语等。
3.分数的构成
分子用基数词，分母用序数词，分子大于1时，分母加s，如：
1/5：one fifth
2/3：two thirds
2-：two and three quarters
4.小数的表示法
0.09：point zero nine
2.7：two point seven
6.百分数的表达法
90%：ninety percent
0.5%：point five percent
6.倍数表达法
表示两倍时用twice，表示三倍以上的倍数时用times。如：
The earth is 49 times the size of the moon.
This desk is twice as large as that one.
6.算式表达法：
5+6：five plus six(or five and six)
7-6：seven minus six
23：two multiplied by three(or two times three)
8/4：eight divided by four
初中英语语法专项练习题之数词
1. 1). There are ___ days in a year.
A. three hundreds sixty-five B. three hundreds and sixty-five C. three hundred and sixty-five D. three hundred and sixty five
2). There are____ students in this school.
A. eight hundreds and forty-six B. eight hundred and forty six C. eight hundred and forty-six D. eight hundred forty-six
2. 1).______people visit this museum every day.
A. Hundred B. Hundreds C. Hundred of D. Hundreds of
2).There are two___ people in the meeting room.
A. hundred B. hundreds C. hundreds of D. hundred o
3). Every year ___ watch NBA on TV.
A. million people B. millions of people
C. millions people D. million of people
4). ____ trees have been planted in our school in the past 10 years.
A. Thousands of B. Two thousands C. Thousand of D. Two thousand of
5). Look! There are ___ in the sky.
初中英语语法大全：数词
定义：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。
I基数词
1.基数词的构成
(1)1-20
one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen, sixteen, seventeen, eighteen, nineteen, twenty
(2)21-99 先说“几十”，再说“几”，中间加连字符。
23→twenty-three,34→thirty-four,45→forty—five,56→fifty-six,67→sixty-seven,78→seventy-eight,89→eighty-nine,91→ninety-one
(3)101—999先说“几百”，再加and,再加末两位数或末位数;
586→five hundred and eighty-six,803→eight hundred and three
(4)l,000以上,先从右往左数，每三位数加一个“,”,第一个“,”前为thousand.第二个“,”前为
million,第三个“,”前为billion(美式)或thousand ,million(英式),然后一节一节地表示。
1,001→one thousand and one
9,785→nine thousand, seven hundred and eighty-five
18,423→eighteen thousand, four hundred and twenty-three
6,260,309→six million two hundred and sixty thousand three hundred and nine
750,000,000,000→seven hundred and fifty, billion(美式) seven hundred and fifty thousand million(英式)