Unit4 数词 I 语法考点超级归纳表示数目多少或顺序先后的词叫做数词（ Numerals）。数词分为两大类：基数词（ Cardinal Numerals）和序数词（Ordinal Numerals）。考点一：基数词基数词表示数目，下面是最基本的基数词，其他数目均由这些基数词构成。1 one 11 eleven 2 two12 twelve20 twenty3 three13 thirteen30 thirty100 a hundred4 four14 fourteen40 forty1,000 a thousand5 five15 fifteen50 fifty1,000,000 a million6 six16 sixteen60 sixty1,000,000,000 a billion（十亿）7 seven17 seventeen70 seventy8 eight18 eighteen80 eighty9 nine19 nineteen90 ninety10 ten除了上表所列的基数词外，其他基数词的构成方法如下表所示。构成例词21～99：由十位数加个位数 1～9 构成，中间须加连字符“-”28 twenty-eight 32 thirty-two 44 forty-four 56 fifty-six67 sixty-seven 79 seventy-nine 81 eighty-one 95 ninety-five101 ～ 999 ： 由 1 ～ 9 加hundred 构成百位数，如有十位数及个位数，中间用 and 连接（也可不用），若十位数为 0 时，and 不可省。101 one hundred and one 212 two hundred (and) twelve323 three hundred (and) twenty-three 457 four hundred (and) fifty-seven805 eight hundred and five 999 nine hundred (and) ninety-nine1,000 以上的数目表达：从后向前分段，每三位数加一个1,029 a thousand and twenty-nine 逗号，第一个逗号前的数为thousand，第二个逗号前的数为 million，第三个逗号前的数为 billion7,287 seven thousand two hundred and eighty-seven10,000 ten thousand 65,721 sixty-five thousand, seven hundred and twenty-one100,000 a (one) hundred thousand150,206 one hundred and fifty thousand, two hundred and six2,000,000 two million4,261,000 four million, two hundred and sixty-one thousand80,000,000 eighty million150,000,000 one hundred and fifty million6,000,000,000 six billion （英国英语说 six thousand million）小贴士：several 与 hundred, thousand 等 词 连 用 时 ， hundred, thousand 等词后不加-s，例如：several hundred students几百名学生；several million dolla...
