【ppt课件】英语数词用法

1、英语数词用法英语数词用法数词分基数词和序数词两类。一、 数词的分类1. 基数 a从110one，two，three，four，five，six，seven，eight，nine，tenb从 1119eleven，twelve， thirteen， fourteen， fifteen， sixteen， seventeen，eighteen， nineteenc从 2199特殊:twenty，thirty, forty，fifty，eighty 21 twenty-oned百位数101 a hundred and onee千位数以上 thousand million百万 billion十亿f1)

2、基数词表示确切的数时，不用复数形式. 2)表示不确切数，如成百、成千上万，则用复数。there are hundreds of people in the hall320 three hundred and twentyg人的不确切岁数或年代，用几十的复数形式。he became a professor in his thirtiesit was in the 1960sh基数词的句法功能可作主语、宾语、定语、表语、同位语。the two happily opened the box（作主语）they three tried to finish the task （作同位语）2. 序数词表示顺

3、序的词称为序数词。a第一至第十九特殊: first， second， third， fifth，eighth，ninth， twelfth 其他: 添加“th”。如 sixth、nineteenthb从第二十至第九十九变y为i，再加“eth”构成。twentytwentieth thirtythirtieth表示第几十几时，用几十的基数词+连字符“”+个位序数词。thirty-first 第三十一 fifty-sixth 第五十六seventy-third 第七十三 ninety-ninth 第九十九c序数词的缩写形式:阿拉伯数字后加上th。irstlst second2nd third3rd

4、fourth4th twentieth20thtwenty-third23rdd序数词的句法功能序数词在句中可作主语、宾语、定语和表语。the second is what i really need（作主语）he choose the second（作宾语）we are to carry out the first plan（作定语）she is the second in our class（作表语）注：通常前面要加定冠词 the；但出现不定冠词a或an时，则表示“再”，“又”。well go over it a second time另外，基数词也可以表示顺序。the first les

5、sonlesson onethe twenty-first roomroom 21（twenty-one）二、时刻表示法1. 几点钟 5:00 读作 five oclock 2. 几点过几分 five past seven 七点过五分half past six 六点半a quarter past eight 八点过一刻3. 几点差几分 ten to eight 差十分八点a quarter to twelve 差一刻十二点twenty to six 差二十分六点another, other, more修饰数词的用法修饰数词的用法1. another a) another+名词单数 b)表“另外

6、的、额外的、附加的时，+few或具体数字的复数 1have you finished your report yet？ no，i will finish it in 10 minutes aanother bother cmore dless 2the strike may last another three days罢工可能还要持续三天。2. other +复数名词，置于数词之后b)但与定冠词the连用时，other要放在数词前。 1tony is going camping with _boys next sundayalittle two other btwo little other

7、 ctwo other little dlittle other two 3do you know where he found the other two photos？另外两张照片 3. more 1more1）she has got five more electric fans她还有五台电扇。 2more还可与a little，a few，a lot，several等词连用（1）there are many more dictionaries on the desk课桌上有许多词典。 （2）would you like some more tea？再喝点茶好吗？ 4. 名词省略 如果前

8、后意思清楚，another或more后面的名词可以省去。如： 1i climbed the stairs slowly，carrying a big suitcase，my father following with two more四、加减乘除表示法1. “加加”用plus，and或add表示 how much is two plus three? it is fivetwo and three is equal to five2. “减减”用 minushow much is ten minus six?3. “乘乘”multiply3x4? how much is three times

9、 four?4. “除除”用divide的过去分词形式表示164=? how much is sixteen divided by four?五、分数表示法1. 基数词作分子，序数词作分母，除了分子是“1”，其它情况下序数词都要用复数形式2. 当分数后面接名词时，如果分数表示的值大于1，名词用复数；小于1，名词用单数。1 1/2 hours 一个半小时（读作 one and a half hours）七、百分数表示法百分数用基数percent表示50 fifty percent百分之五十percent不用复数形式。选择填空。1march is _month of a yeara a three

10、 b the third c a third2we will have a meeting at 8:05_afive to eight beight five ceight o five3eight plus eight is_.asixteen bsixty-four cone4he is an _boyaeight years beight-year-old ceight-years-old5we will have a_ walkaten minutes bten minutes cten-minutesb the thirdceight o fiveasixteenbeight-ye

11、ar-oldbten minutes6the wall is_.afour meters long bfour meter long cfour-meter long7whats the date today? its_amarch the eight bmarch eighthceight，march8it happened in the 1040sa in the forties of the eleventh centuryb in the forties of the tenth centuryc in the forty9about_ of the earths surface is covered with water.a. three-fours b. three-fourth c. three-fourthsafour meters longbmarch eightha in the fortie