数词表示数目多少或顺序先后的词。分为基数词、序数词、小数、分数、百分数和倍数基数词1-10 11-19 20-90 （整十）100one eleven 100 a hundredtwo twelve twenty 1,000a thousandthree thirteen thirtyfour fourteen forty 1,000,000a millionfive fifteen fiftysix sixteen sixty 1,000,000,000a billionseven seventeenseventyeight eighteen eightynine nineteen ninetyten基数词n Attention ！n 1319 的数皆由teen 结尾。eighteen 中只保留一个t 。*eightteen ；thirteen ，fifteen ，分别由three 、five 转化而来。n 21-99 间非整十数，一般十位和个位间加-n Twenty-one
