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1、五、数词,一、 数词的分类 数词分基数词和序数词两类。 表示数目多少的数词叫做基数 词，如：one, ten, fifteen 等； 表示顺序先后的数词叫做序数词，如 second, fifth, twelfth等。,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，si
2、xty, seventy, eighty ,ninety 21:twenty-one 56:fifty-six,D百位数 101 one hundred and one 178 one hundred (and) seventy-eight E千位数以上 thousand千 million百万 billion十亿 4,000：four thousand 2,000,000:two million 6,000,000,000:six billion F.基数词表示确切的数时，不用复数形式. 表示不确切数，如成百、成千上万，则用复数。 320 three hundred and twenty Th
3、ere are hundreds of people in the hall,2. 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+“-”+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,序数词
4、构成规律口诀,基变序,有规律, 一二三特殊记，词尾字母t, d, d， 加th从4起，(fourth, sixth) 八去“t”，九去“e”， “f”来把“ve”替，(fifth, twelfth) 单词“ty”作结尾，“ty”变成“tie”， (twentieth, thirtieth,ninetieth) 若是遇到几十几，只变个位就可以。(fifty-fifth) 序数词缩写记清楚,数字后跟两字母 （first1st second2nd third3rd fourth4th twentieth20th twenty-third23rd ）.,exercise,1.写出下列词的序数词形式 1
5、.one 2.two 3.six 4.five 5.nine 6.twelve 7.eight 8.twenty-one,first,second,sixth,fifth,ninth,twelfth,eighth,twenty-first,2.写出下列词的基数词形式。 1.third 2.fourth 3.tenth 4.twentieth 5.nineteenth 6.thirty-first _,three,four,ten,twenty,nineteen,thirty-one,exercise,3.选择,1. My cousins birthday is on the of Octobe
6、r. A. three B. first C. the second,B,2. -What date is it today? -Its of September. A. 26th B. the 26th C. twenty-six,B,3. There are days in a week. A. the seven B. seventh C. the seventh D. seven,D,exercise,4.Sunday is the day of a week. A. one B. first C. second,B,5.Twenty-eight minus(减)six is . A.
7、 the twenty- second B. twenty- two C. twenty- second,B,6. Four plus(加) is twelve. A. seven B. eight C. nine,B,一、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,数词的
8、用法,one oclock,ten past two,half past three,twenty to five,a quarter past five,a quarter to seven,seven fifty,表示在几点钟用介词 at,数词的表示法 时间,二、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 m
9、uch 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?,三、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） 四、百分数表示法 百分数用基数percent 50 fifty percent 百分之五十 percent不用复数形式。,1 5,分子 基数词 分母
10、 序数词,one fifth,2 7,分子 1 分母 + s,two sevenths,1 4,分子 a 分母 quarter,a quarter,3 4,three quarters,1 2,a half,1 3,three and one third,3,基数词 + and + 分数,数词的表示法 分数百分数,80 %,基数词 + percent,eighty percent,half / (百)分数 + of + 可数名词复数 谓语动词用复数 half / (百)分数 + of + 不可数名词 谓语动词用单数,3.78,three point seven eight,一般编码用 名词 +
11、 基数词 207房 三年级一班 第五部分 第一课 3 号汽车 第一中学,Room 207 Class one Grade three part five = the fifth part lesson one = the first lesson Bus No.3 = the No.3 bus No. 1 Middle School,五、编号,一、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
12、Ceight fifth 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 Cf
13、our-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 eleventh century,C. three-fourths,10. He went down to the village which was _miles away from the city. A. three hundreds B. three hundred C. three hundreds of,B. three hundred,
