1、核心数词one,two,three,four,five, six, seven,eight, nine, ten, eleven, twelve, thirteen, fourteen,fifteen,sixteen, seventeen, eighteen, nineteen, twenty, thirty, forty, fifty, sixty, seventy,eighty, ninety, hundred, thousand, million, first, second, third, fourth, fifth,sixth,seventh,eighth, ninth, tenth
2、, eleventh, twelfth, thirteenth, fourteenth, fifteenth, sixteenth,seventeenth,eighteenth,nineteenth, twentieth, thirtieth, fortieth, fiftieth, sixtieth, seventieth,eightieth,ninetieth,hundredth识记理解1.一般情况下，基数词变序数词直接在词尾加th,但是特殊的变化需要特殊记忆。2.当基数词hundred,thousand,million,billion等词前有具体数词修饰时，用单数形式；但当它们表示不确切
3、的数量时，用复数形式，并且与of连用。3.序数词前有名词所有格、形容词性物主代词等限定时，通常不用定冠词the.【链接】1.分数由基数词和序数词构成。分子用基数词表示，分母用序数词表示。分子大于1时，分母要用序数词的复数形式。2.当分数用于复数可数名词或代词（指代复数可数名词）前作主语时，谓语动词用复数形式；当分数用于不可数名词或代词（指代不可数名词）前作主语时，谓语动词用单数形式。练习巩固I.写出下列基数词的序数词形式。1.two 2.nine 3.twelve 4.forty 5.eight 6.ninety 7.hundred 8.three 9.twenty 10.fifty II.根
4、据汉语意思完成英语句子，每空一词。1.下周一是我二十岁生日。Next Monday is birthday.2.每天成千上万的人参观长城。 people visit the Great Wall every day.3.我们班五分之一的学生来自城市。 The students in our class from cities.4.这儿三分之二的土地被树和草覆盖。 the land here covered with trees and grass.5.上周日两百多个学生参观了博物馆。Last Sunday more than students visited the museum.6.我哥哥在
5、网球比赛中获得了第一名。My brother won in the tennis match.7.这座楼的第九层住着九个人。There are people living in the floor of this building.8.十一月是一年中的第十一个月份。November is of the year.9.你能借我50美元吗？Can you lend me ？10.白天虽然你看不见，但是天空中有数百万星星。Therere stars in the sky in the daytime although you cant see them.数词参考答案练习巩固I. 1.second 2.ninth 3.twelfth 4.fortieth 5.eighth 6.ninetieth 7.hundredth 8.third 9.twentieth 10.fiftiethII .1.my twentieth 2.Thousands of 3.One fifth of;are 4. Two thirds of; is 5.two hundred 6. first place 7.nine;ninth8.the eleventh month 9.fifty dollars 10.millions of
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