初中英语语法大全：数词定义：表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。表示数目多少的数词叫基数词；表示顺序的数词叫序数词。I基数词1.基数词的构成（1）1-20one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen, sixteen, seventeen, eighteen, nineteen, twenty（2）21-99 先说“几十”，再说“几”，中间加连字符。23twenty-three,34thirty-four,45fortyfive,56fifty-six,67sixty-seven,78seventy-eight,89eighty-nine,91ninety-one（3）101999先说“几百”，再加and,再加末两位数或末位数；586five hundred and eighty-six,803eight hundred and three（4）l,000以上,先从右往左数，每三位数加一个
