
广州新版八年级unit numbers 数词讲解.doc
12页数词数词分基数词和序数词基数词表示数目,序数词表示顺序1.基数词 (1)基数词的具体形式如下:A. 从1——10one,two,three,four,five,six,seven,eight,nine,ten.B.从 11——19eleven,twelve, thirteen, fourteen, fifteen, sixteen, seventeen,eighteen, nineteen.注:标记为加粗的单词特殊记忆,其他的词都是由其个位数形式后添加后缀-teen构成C.从 21——99整数几十中除twenty,thirty, forty,fifty,eighty为特殊形式外,sixty,seventy,ninety都是其个位数形式后添加后缀-ty构成表示几十几时,在几十和个位基数词形式之间添加连字符“-”21 twenty-one 76 _____________ 89_______________99_____________ 35_______________ 63_________________47______________ 54________________ 23__________________D.百位数个数基数词形式加“hundred”,表示几百,在几十几与百位间加上and.101 a hundred and oneE.千位数以上从数字的右端向左端数起,每三位数加一个逗号“,”。
从右开始,第一个“,”前的数字后添加 thousand(千),第二个“,”前面的数字后添加 million(百万),第三个“,”前的数字后添加 billion(十亿)然后一节一节分别表示,两个逗号之间最大的数为百位数形式2,648 two thousand six hundred and forty-eight34578089__________________________________同步练习( )1. –How long is the new bridge? Do you know ?--Yes. It’s about _____. A. one thousand one hundred and eighty metersB. one thousand and one hundred fifty metersC. two thousands one hundred forty metersD. two thousands seventy and three meters( )2. There are ____ days in a year. A. three hundred and sixty-five B. three hundred and sixty fiveC. three hundred sixty-five D. three hundreds and sixty- five( )3. Nanjing is a city with many places of interest. ___ tourists come here every year. A. Thousand of B. Thousand C. Thousands D. Thousands of ( )4. –How many people are there in Changsha?--About six _____. A. million B. millions C. millions of( )5.—How many people will come to Beijing for the Olympic Games in 2008? --It’s hard to say. _____ people, I think. A. Million of B. Millions of C. Two millions of D. Two million of(2)基数词的用法A. 基数词在表示确切的数字时,不能使用百、千、百万、十亿的复数形式;但是,当基数词表示不确切数字,如成百、成千上万,三三两两时,基数词则以复数形式出现。
hundreds of 数以百计 Thousands and thousands of 成千上万 大厅里有数以百计的人B.表示人的不确切岁数或年代,用几十的复数形式表示in his thirties 在他三十多岁的时候 in forties 在四十多岁的时候in the 1960s 二十世纪六十年代他三十多岁时成为了教授 )6.During World WarⅡ, a Jewish(犹太的)lady was protected (保护)by a local family in Shanghai in her ___. A. fifties B. fifty C. fiftieth D. the fiftiethC. 基数词的句法功能基数词在句中可作主语、宾语、定语、表语、同位语The two happily opened the box.两个人高兴地打开了盒子作主语)I need three altogether. 我总共需要三个作宾语)Four students are playing volleyball outside.四个学生在外面打排球。
作定语)We are sixteen. 我们是16个人作表语)They three tried to finish the task before sunset.他们三个人尽力想在日落前完成任务作同位语)D. 基数词也可以表示顺序只需将基数词放在它所修饰的名词之后即可,不需要添加定冠词the first lesson=Lesson One the fifth page=Page 5(five)the twenty-first room=Room 21(twenty-one)( )7. Jack is now in _____. A. the three grade B. Grade Third C. Grade Three( )8. Now children, turn to page __and look at the __ picture in Lesson Two.A. twentieth; one B. twenty; one C. twentieth; first D. twenty; first E.时刻表示法六点半_____________________八点过一刻_______________________十一点四十五分___________________________五点四十分______________________________★在日常生活中,常用下列简单方法表示时间。
以小时、分种为单位分别读出数字6:31 读作 six thirty-one 14:03 读作 fourteen o three注:时刻表上的时间大多采用24小时表示法,这样就不需要用a.m.表示上午,p.m.表示下午了 )9. --It’ 9:45. –Yes, It’s ____.A. fifteen from ten Ba quarter to ten C fifteen past nine D. a quarter past ten2. 序数词(1)序数词的主要形式:A.从第一至第十九其中,one— first, two— second, three— third, five— fifth,eight—eighth,nine—ninth,twelve— twelfth为特殊形式,其它的序数词都是由其相对应的基数词后面添加“th”构成例如: six— sixth、nineteen— nineteenth.B.从第二十至第九十九整数第几十的形式由其对应的基数词改变结尾字母y为i,再加“eth”构成twenty——twentieth thirty——thirtieth表示第几十几时,用几十的基数词形式加上连字符“-”和个位序数词形式一起表示。
thirty-first 第三十一 fifty-sixth 第五十六seventy-third 第七十三 ninety-ninth 第九十九C.第一百以上的多位序数词由基数词的形式变结尾部分为序数词形式来表示one hundred and twenty-first 第一百二十一D.序数词的缩写形式有时,序数词可以用缩写形式来表示主要缩写形式有first——lst second——2nd third——3rdfourth——4th sixth——6th twentieth——20thtwenty-third——23rd其中lst,2nd,3rd为特殊形式,其它的都是阿拉伯数字后加上th口诀:基变序,有规律,first, second, third要牢记;其它变化有公式,基数词尾加-th; eight去t , nine去e;从twenty, thirty到ninety, 需变y为ie; five和twelve, 需将ve变f;若是遇到“几十几”,只变个位就可以。
)9. Friday is the _____ day of the week. ( )10. He believed his lucky number was ten, so he decided to live on the ____ floor.A. lowest B. ten C. tenth ( )11. I have made ____ dumplings. Now I’m making the ___ one.A. twenty; twentieth-first B. twenty; twenty-firstC. twentieth; twenty-first D. twenty; twenty-one 序数词的用法A.序数词的句法功能序数词在句中可作主语、宾语、定语和表语The second is what I really need.第二个是我真正需要的作主语)He choose the second.他挑选了第二个作宾语)We are to carry out the first plan.我们将执行第一个计划作定语)She is the second in our class.在我们班她是第二名。
作表语)注:序数词在使用时,通常前面要加定冠词 the;但是如果序数词前出现不定冠词a或an时,则表示“再——”,“又——”We’ll go over it a second time.我们得再念第二遍完形填空 One day a mother rat and her babies were out in an open field. They were playing an。












