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1、数 词定义:表示数目多少或顺序次第的词叫作数词。 数词包括基数词和序数词两种一、 基数词A、 1至12的基数词是独立的词：one two three four five six seven eight nine ten eleven twelve B、 13至19的基数词以后缀-teen结尾：thirteen fourteen fifteen sixteen seventeen eighteen nineteenC、 20至90的整十位数的词以后缀-ty结尾：twenty thirty forty fifty sixty seventy eighty ninetyD、 几十几的基数词由十位数的
2、词和个位数的词合成，中间加连字符“-” eg: 34 thirty-four 42 forty-twoE、 三位数的基数词须在百位和十位（若无十位则和个位）之间加and eg: 158 one hundred and fifty-eightF、 四位数即1，000以上的基数词，从后往前数，每三位加一个逗号“，”第一个逗号前为千thousand, 第二个逗号前为百万million, 第三个逗号前为十亿billioneg: 6,364,285,751 six billion, three hundred and sixty-four million, two hundred and eighty-
3、five thousand, seven hundred and fifty one二、 序数词A、 第1到第3: first second thirdB、 第4到第19的序数词以后缀-th结尾： fourth fifth sixth seventh eighth ninth tenth eleventh twelfth thirteenth fourteenth fifteenth sixteenth seventeenth eighteenth nineteenthC、 第20到第90的十位数序数词变-y为-i再加eth: twentieth thirtieth fortieth fift
4、ieth sixtieth seventieth eightieth ninetiethD、 整单位数的序数词直接加th: hundredth thousandth millionth billionthE、 其余的序数词的构成为：基数词+序数词 eg: 132nd one hundred and thirty-second三、 小数表达法 eg: 3.26 three point two six四、 分数表达法 eg: 1/5 one fifth 2/5 two fifths 1/5 one in five 或 one out of five五、 百分数表达法 eg: 45% forty-f
5、ive percent六、 倍数表达法A、 A is + 倍数as + adj./adv.原级(many/much + n.) + as + Beg: Line A is three times as long as line B. (Australia has fourteen times as many people as America.)B、 A is + 倍数 + adj./adv.比较级 + than Beg: Line A is twice longer than line B.C、 A is + 倍数 + the + 相应n.(height/width/length/size)
6、 + of + Beg: Line A is three times the length of line B.D、 A is + 倍数 + that/those + of Beg: Toms age is twice that of Jims.七、 编号顺序的表达eg: 第一课 Lesson one 着重编号the First Lesson 着重顺序数 词定义:表示数目多少或顺序次第的词叫作数词。 数词包括基数词和序数词两种八、 基数词A、 1至12的基数词是独立的词：one two three four five six seven eight nine ten eleven twelve
7、 B、 13至19的基数词以后缀-teen结尾：thirteen fourteen fifteen sixteen seventeen eighteen nineteenC、 20至90的整十位数的词以后缀-ty结尾：twenty thirty forty fifty sixty seventy eighty ninetyD、 几十几的基数词由十位数的词和个位数的词合成，中间加连字符“-” eg: 34 thirty-four 42 forty-twoE、 三位数的基数词须在百位和十位（若无十位则和个位）之间加and eg: 158 one hundred and fifty-eightF、
8、四位数即1，000以上的基数词，从后往前数，每三位加一个逗号“，”第一个逗号前为千thousand, 第二个逗号前为百万million, 第三个逗号前为十亿billioneg: 6,364,285,751 six billion, three hundred and sixty-four million, two hundred and eighty-five thousand, seven hundred and fifty one九、 序数词A、 第1到第3: first second thirdB、 第4到第19的序数词以后缀-th结尾： fourth fifth sixth seven
9、th eighth ninth tenth eleventh twelfth thirteenth fourteenth fifteenth sixteenth seventeenth eighteenth nineteenthC、 第20到第90的十位数序数词变-y为-i再加eth: twentieth thirtieth fortieth fiftieth sixtieth seventieth eightieth ninetiethD、 整单位数的序数词直接加th: hundredth thousandth millionth billionthE、 其余的序数词的构成为：基数词+序数词
10、 eg: 132nd one hundred and thirty-second十、 小数表达法 eg: 3.26 three point two six十一、 分数表达法 eg: 1/5 one fifth 2/5 two fifths 1/5 one in five 或 one out of five十二、 百分数表达法 eg: 45% forty-five percent十三、 倍数表达法A、 A is + 倍数as + adj./adv.原级(many/much + n.) + as + Beg: Line A is three times as long as line B. (Au
11、stralia has fourteen times as many people as America.)B、 A is + 倍数 + adj./adv.比较级 + than Beg: Line A is twice longer than line B.C、 A is + 倍数 + the + 相应n.(height/width/length/size) + of + Beg: Line A is three times the length of line B.D、 A is + 倍数 + that/those + of Beg: Toms age is twice that of Jims.十四、 编号顺序的表达eg: 第一课 Lesson one 着重编号the First Lesson 着重顺序