基数词的构成
(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 先说几十”，再说几”，中间加连字符。
23→twenty-three,34→thirty-four,
(3)101—999先说几百”，再加and,再加末两位数或末位数;
586→five hundred and eighty-six,803→eight hundred and three
(4)l,000以上,先从右往左数，每三位数加一个,”,第一个,”前为thousand.第二个,”前为million,第三个,”前为billion,然后一节一节地表示。
9,785→nine thousand, seven hundred and eighty-five
6,260,309→six million two hundred and sixty thousand three hundred and nine
750,000,000,000→seven hundred and fifty, billion
