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1、 1 数 词【要点提示】数词有两种：基数词和序数词。基数词表示人或事物的数量，如 one，twenty-two 等；序数词表示人或事物的次序，如 first，twelfth 等。一、数词的构成 1 基数词 在基数词的书写中，112要特别记忆，1319都是以-teen 结尾，整十的数都是以-ty 结尾。在表示“几十几”时，十位数和个位数之间要加连字符“-”。2 序数词 119 的序数词中除 first，s econd，third 外，其余均由基数词加-th 构成，但是 fifth，eighth，ninth，twelfth 有变化。两位数的基数词变为序数词时，只需将个位数变成序数词，十位数不变。二
2、、数词的用法 1 hundred，thousand，million，billion 前面有具体的数字修饰时用单数形式，后面的名词要用复数形式。如：five thousand teachers 如果前面没有具体的数，可用“其复数形式+of+可数名词的复数”。如：hundreds of students，millions of workers 2 数词可以用来表示编号或次序。如：Lesson Ten=the tenth lesson(第十课)3 数词可以表示年代、年龄等。如：in the 1990s(在二十世纪九十年代)in his thirties(在他三十多岁时)4 数词常与名词等一起构成复合
3、定语，这时，它们中间一般有连字符，并且只用名词的单数形式。如：a five-week holiday 5 表示分数时，分子用基数词，分母用序数词。当分子大于 1 时，分母要用复数形式。如：2/3 two thirds,1/5 one fifth 6 数词可以表示时间。(1)钟点+分钟（顺读法）如：11.56 eleven fifty-six(2)分钟+to/past+钟点（倒读法）如：4.30 half past four 5.05 five past five 6.45 fifteen to seven(a quarter to seven)【数词专练】.请从各题后所给的 A、B、C、D 四
4、个选项中选出最佳答案。()1.The old building was founded_.A.in 1820s B.in the 1820 C.in the 1820s D.in the 1820s()2._ of the ten boys is the best singer of all.A.The fourth B.The four C.Fourth D.Four()3._ third of the milk is bad.A.One B.First C.Two D.Second()4.Twelve and_ is forty-one.A.twenty-eight B.twenty-ni
5、ne C.thirty-nine D.thirty-eight()5.If you take a bus,it will only take you 10_,but its about 2 30_walk if you go there on foot.A.minutes,minutes B.minutes,minutes C.minutes,minutes D.minutes,minutes.请根据句意及汉语提示完成句子，每空词数不限。1.We are the master of the _(二十一)century.2._(三分之一)of the land is covered with s
6、now.3.Two _(百万)dollars is enough.4.Ann received a lot of presents on her _(第十二)birthday 5.Do you know that _(八十岁的)man?6._(成千上万的)people were hurt in the accident.7.About_(两千)men and women are in the square.8.There are 2,000 boys in this shool,and _(他们当中五百人)like playing football.9.About _(五分之三)of the students in the class are girls.10.He is olny a _(九岁的)boy.参考答案 数词专练.1-5 DAABB.1.twenty-first/21st 2.One third 3.million 4.twelfth/12th 5.80-year-old/eighty-year-old 6.Thousands of 7.two thousand 8.five hundred of them 9.three fifths 10.9-year-old/nine-year-old