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

• 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

• 13至19的基数词以后缀-teen结尾：thirteen fourteen fifteen sixteen seventeen eighteen nineteen

C、 20至90的整十位数的词以后缀-ty结尾：twenty thirty forty fifty sixty seventy eighty ninety

D、 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-two

E、 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-eight

F、 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billion

eg:          6,364,285,751                six billion, three hundred and sixty-four million, two hundred and eighty-five thousand, seven hundred and fifty one

• 序数词

A、 第1到第3:  first   second   third

B、 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 nineteenth

C、 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 ninetieth

D、 整单位数的序数词直接加th:  hundredth thousandth millionth billionth

E、 其余的序数词的构成为：基数词+序数词             eg:  132^nd  one hundred and thirty-second

• 小数表达法 eg:  3.26  three point two six
• 分数表达法 eg:  1/5  one fifth    2/5  two fifths

                     1/5  one in five 或 one out of five

• 百分数表达法    eg:  45%  forty-five percent

 

• 倍数表达法

A、 A is + 倍数as + adj./adv.原级(many/much + n.) + as + B

eg:  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 B

eg:  Line A is twice longer than line B.

C、 A is + 倍数 + the + 相应n.(height/width/length/size) + of + B

eg:  Line A is three times the length of line B.

D、 A is + 倍数 + that/those + of B

eg:  Tom’s age is twice that of Jim’s.

• 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

• 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

• 13至19的基数词以后缀-teen结尾：thirteen fourteen fifteen sixteen seventeen eighteen nineteen

C、 20至90的整十位数的词以后缀-ty结尾：twenty thirty forty fifty sixty seventy eighty ninety

D、 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-two

E、 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-eight

F、 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billion

eg:          6,364,285,751                six billion, three hundred and sixty-four million, two hundred and eighty-five thousand, seven hundred and fifty one

• 序数词

A、 第1到第3:  first   second   third

B、 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 nineteenth

C、 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 ninetieth

D、 整单位数的序数词直接加th:  hundredth thousandth millionth billionth

E、 其余的序数词的构成为：基数词+序数词             eg:  132^nd  one hundred and thirty-second

• 小数表达法 eg:  3.26  three point two six
• 分数表达法 eg:  1/5  one fifth    2/5  two fifths

                     1/5  one in five 或 one out of five

• 百分数表达法    eg:  45%  forty-five percent

 

• 倍数表达法

A、 A is + 倍数as + adj./adv.原级(many/much + n.) + as + B

eg:  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 B

eg:  Line A is twice longer than line B.

C、 A is + 倍数 + the + 相应n.(height/width/length/size) + of + B

eg:  Line A is three times the length of line B.

D、 A is + 倍数 + that/those + of B

eg:  Tom’s age is twice that of Jim’s.

• 编号顺序的表达

eg:   第一课         Lesson one 着重编号

the First Lesson 着重顺序