英语数词用法..

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 There are hundreds of people in the hall．
数词的表示法 — 时间 时间类型
整点 ﹤30分钟 = 30 分钟 ﹥30分钟 分钟逢15 即 一刻钟 简化法
表示在几点钟用介词 at
例 读法
表示法
基数词（+ o’clock) 1:00 one o’clock 分钟 + past +小时 half + past + 小时 2:10 ten past two 3:30 half past three
80 %
eighty percent
基数词 + 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
五、编号
一般编码用 名词 + 基数词 207房 Room 207 三年级一班 Class one Grade three 第五部分 part five = the fifth part 第一课 lesson one = the first lesson 3 号汽车 Bus No.3 = the No.3 bus 第一中学 No. 1 Middle School
B．从 11—19 eleven，twelve， thirteen， fourteen， fifteen， sixteen， seventeen，eighteen， nineteen． C．从 21—99 特殊:twenty，thirty, forty，fifty，sixty, seventy, eighty ,ninety 21:twenty-one 56:fifty-six
1.third three 2.fourth four 3.tenth ten 4.twentieth twenty 5.nineteenth nineteen 6.thirty-first thirty-one _
exercise
3.选择
1. My cousin’s birthday is on the B of October. A. three B. first C. the second 2. -What date is it today? -It’s B of September. A. 26th B. the 26th C. twenty-six 3. There are D days in a week. A. the seven B. seventh C. the seventh D. seven
序数词构成规律口诀
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 （first—1st second—2nd third—3rd fourth—4th twentieth—20th twenty-third—23rd ）.
（60-分钟） + to + 4:40 twenty to five （小时 + 1）
a quarter 按顺序读基数词 5:15 a quarter past five 6:45 a quarter to seven 7:50 seven fifty
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 much is three times four? 4. “除”用divide的过去分词形式表示 16÷4=? How much is sixteen divided by four?
数词的用法
一、时刻表示法 1. 几点钟 5:00 读作 five o’clock 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
exeBaidu Nhomakorabeacise
1.写出下列词的序数词形式
1.one first 2.two second 3.six sixth
4.five fifth 5.nine ninth 6.twelve twelfth
7.eight eighth 8.twenty-one twenty-first
2.写出下列词的基数词形式。
10. He went down to the village which was ___miles away from the city. A. three hundreds B. three three hundred hundred B. C. three hundreds of
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。
exercise 4.Sunday is the B day of a week. A. one B. first C. second 5.Twenty-eight minus(减)six is B . A. the twenty- second B. twenty- two C. twenty- second 6. Four plus(加) B is twelve. A. seven B. eight C. nine
6．The wall is____. A．four meters long B．four meter long C．four-meter long 7．What's the date today? It's___． A．March the eight B．March eighth C．eight，March 8．It happened in the 1040's． A． ． in in the the forties forties of of the the eleventh eleventh century century． ． A B． in the forties of the tenth century． C． in the forty 9．About_____________ of the earth\'s surface is covered with water. A. three-fours B. three-fourth C. C. three-fourths three-fourths
数词的表示法 — 分数百分数
1 5 2 7 1 4 3 4
分子 基数词 分母 序数词 分子 ﹥ 1 分母 + s
one fifth two sevenths
分子 a 分母 quarter a quarter three quarters
1 2
a half
1 基数词 + and + 分数 three and one third 3 3
★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1—10 one，two，three，four，five，six，seven， eight，nine，ten
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。 twenty——twentieth thirty——thirtieth ☆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
一、选择填空。 1．March is ____month of a year． A． a three B． the third C． a third 2．We will have a meeting at 8:05____． A．five to eight B．eight five C C． ．eight eight ofifth five 3．Eight plus eight is____. A． ．sixteen sixteen B．sixty-four C．one A 4．He is an ____boy． B ． eight-year-old A．eight years B ． eight-year-old C．eight-years-old 5．We will have a___ walk． A．ten minutes B．ten minutes' C．ten-minutes