定義：表示數(shù)目多少或順序多少的詞叫數(shù)詞，數(shù)詞分為基數(shù)詞和序數(shù)詞。表示數(shù)目多少的數(shù)詞叫基數(shù)詞；表示順序的數(shù)詞叫序數(shù)詞。
I基數(shù)詞
1.基數(shù)詞的構(gòu)成
（1）1-20
one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen, sixteen, seventeen, eighteen, nineteen, twenty
（2）21-99 先說“幾十”，再說“幾”，中間加連字符。
23→twenty-three,34→thirty-four,45→forty—five,56→fifty-six,67→sixty-seven,78→seventy-eight,89→eighty-nine,91→ninety-one
（3）101—999先說“幾百”，再加and,再加末兩位數(shù)或末位數(shù)；
586→five hundred and eighty-six,803→eight hundred and three
（4）l,000以上,先從右往左數(shù)，每三位數(shù)加一個“,”,第一個“,”前為thousand.第二個“,”前為
million,第三個“,”前為billion（美式）或thousand ,million（英式）,然后一節(jié)一節(jié)地表示。
1,001→one thousand and one
9,785→nine thousand, seven hundred and eighty-five
18,423→eighteen thousand, four hundred and twenty-three
6,260,309→six million two hundred and sixty thousand three hundred and nine
750,000,000,000→seven hundred and fifty, billion（美式） seven hundred and fifty thousand million（英式）
I基數(shù)詞
1.基數(shù)詞的構(gòu)成
（1）1-20
one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen, sixteen, seventeen, eighteen, nineteen, twenty
（2）21-99 先說“幾十”，再說“幾”，中間加連字符。
23→twenty-three,34→thirty-four,45→forty—five,56→fifty-six,67→sixty-seven,78→seventy-eight,89→eighty-nine,91→ninety-one
（3）101—999先說“幾百”，再加and,再加末兩位數(shù)或末位數(shù)；
586→five hundred and eighty-six,803→eight hundred and three
（4）l,000以上,先從右往左數(shù)，每三位數(shù)加一個“,”,第一個“,”前為thousand.第二個“,”前為
million,第三個“,”前為billion（美式）或thousand ,million（英式）,然后一節(jié)一節(jié)地表示。
1,001→one thousand and one
9,785→nine thousand, seven hundred and eighty-five
18,423→eighteen thousand, four hundred and twenty-three
6,260,309→six million two hundred and sixty thousand three hundred and nine
750,000,000,000→seven hundred and fifty, billion（美式） seven hundred and fifty thousand million（英式）