《英语数词用法》PPT课件.ppt

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110 one，two，three，four，five，six，seven，eight，nine，ten B从 1119 eleven，twelve， thirteen， fourteen， fifteen， sixteen， seventeen，eighteen， nineteen,C从 2199 特殊:twenty，thirty, forty，fifty，eighty 21 twenty-one D百位数 101 a hundred and one E千位数以上 thousand million百万 billion十亿 F1)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 hall 320 three hundred and twenty,G人的不确切岁数或年代，用几十的复数形式。 He became a professor in his thirties It was in the 1960s H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、nineteenth,B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 fourth4th twentieth20th twenty-third23rd D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 lessonLesson One the 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,1Tony is going camping with _boys next Sunday Alittle two other Btwo little other Ctwo other little Dlittle other two 3Do you know where he found the other two photos？另外两张照片 3. more 1more 1）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”用plus，and或add表示 How much is two plus three? It is five Two and three is equal to five 2. “减”用 minus How much is ten minus six? 3. “乘”multiply 3X4? How much is three times four? 4. “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 year A a three B the third C a third 2We will have a meeting at 8:05_ Afive to eight Beight five Ceight o five 3Eight plus eight is_. Asixteen Bsixty-four Cone 4He is an _boy Aeight years Beight-year-old Ceight-years-old 5We will have a_ walk Aten minutes Bten minutes Cten-minutes,B the third,Ceight o five,Asixteen,Beight-year-old,Bten minutes,6The wall is_. Afour meters long Bfour meter long Cfour-meter long 7Whats the date today? Its_ AMarch the eight BMarch eighth Ceight，March 8It happened in the 1040s A in the forties of the eleventh century B in the forties of the tenth century C in the forty 9About_ of the earths surface is covered with water. A. three-fours B. three-fourth C. three-fourths,Afour meters long,BMarch eighth,A in the forties of the eleven