1.编号的事物可用序数词或基数词加名词构成, 如: the fourth lesson =lesson four, the fifteenth page =page fifteen, the ninth part =part nine

4.不规则的序数词如下: the first, the second, the third, the fifth, the eighth, the ninth, the twelfth

3.大于二十的基数词对应的序数词, 只将末位数变为序数词, 前面的其他位数仍用基数词, 如: 第532读作five hundred and thirty-second

2.以y结尾的基数词构成序数词时, 先把y变为i, 再加eth, 如: the twentieth, the fortieth, the fiftieth, the eightieth

1.序数词一般是由基数词加th构成, 序数词前一定要加the, 如: the seventh, the thirteenth, the one hundredth

5.数词dozen, score的用法与hundred, thousand等相同

4.hundred, thousand, million, billion表示具体数目时都不用复数形式, 但它们的复数形式可以用于一些词组中, 如: hundreds of, thousands of, millions of, billions of.

3.四位数和四位以上数字的读法: 阿拉伯数字每三位为一段, 从后往前用逗号分开, 每个逗号处所用的数词分别为: thousand, million, billion, 如: 21,634,755读作twenty-one million six hundred and thirty-four thousand seven hundred and fifty-five. 注意: 读这样的数时, 只在hundred一词后加and

2.三位数的读法: 第一个数字+hundred + and +后面的一位或两位数字, 如: 101读作one hundred and one, 864读作eight hundred and sixty-four

1.两位数: 几十和个位数之间加连词号, 如: twenty-three, forty-seven, ninety-six