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1、专题四数词基数词数字基数词形式举例112独立词one, two, three, four, ten, eleven, twelve1319个位数+ teen (13, 15, 18稍有变化)threethirteen, fourfourteen, fivefifteen整十数个位数+-ty(20, 30, 40, 50, 80稍有变化)twotwenty, threethirty, fourforty, sixsixty几十几整十数加“-”再加个位数21: twenty-one, 55: fifty-five几百几. . . hundred + and +. . . 288: two hund
2、red and eighty-eight【拓展】基数词hundred, thousand, million, billion表示确切数目时, 不能加s。但在表示不确切数目时, 要用复数形式+of 结构, 意为“成百的, 成千上万的, 数百万的, 数十亿的”。例如: five thousand五千; thousands of 成千上万的1. 基数词构成歌诀1至12独立词, 1319 -teen加起。2090整十位, -ty结尾是后缀。几十几, 连字符“-”莫忘记。几百几, hundred后面and立。2. 巧记hundred, thousand等的单、复数用法具体数目用单数; 模糊数目用复数,
3、后面还要加of。序数词基数词的形式变序数词的规则举例一般情况在基数词后加上-thfourfourth以-t结尾在基数词后加-heighteighth以-e结尾去e再加-thnineninth以-ve结尾改ve为f, 再加-thfivefifth; twelvetwelfth以-ty结尾的整十数改y为ie, 再加-thtwentytwentieth20以上的两位数只变个位数thirty-twothirty-second特殊变化onefirst, twosecond, threethird警示 序数词的缩写形式为“阿拉伯数字 + 序数词最后面的两个字母”。例如: first1st; sevente
4、enth17th; twenty-second22nd; thirty-third33rd。基数词变序数词歌诀基数变序数, th来帮助。“8”少“t”, “9”去“e”, y结尾改ie。“ve”要用“f”替, five, twelve是两兄弟。遇到几十几, 只变个位就可以。1、2、3, 特殊记, 结尾各是t, d, d。数词的应用用途举例表示世纪、年代等This took place in the 1970s. 这事发生在20世纪70年代。表示日期、时刻等June the first(6月1日), at six oclock(在6点钟)表示数学运算One plus two is three.
5、1+2=3表示分数one seventh(1/7), three fourths(3/4)表示编号The Third Lesson/Lesson Three(第3课)【拓展】1. 表示分数时, 分子用基数词, 分母要用序数词; 如果分子大于1时, 分母要用复数。例如: 1/2: one second, 3/4: three fourths。2. 时刻的表达法有两种。一是时在前, 分在后, 按基数词顺读; 二是分在前, 时在后, 中间加介词to或past, 另外, 当分为15、45时, 后一种表达法也可用quarter, 当分为30时, 可用half。例如: 10: 15 ten fifteen
6、或a quarter past ten; 8: 45eight forty-five或 a quarter to nine; 6: 30six thirty 或 half past six“in ones +整十数词的复数”表示“在某人多少岁时”。1. 巧记分数的表达法分子基, 分母序。分子大于1, 分母加-s。2. “时间”表达法“时”在前, “分”在后, quarter, half不能有。如果出现past, to, 我们可要看清楚; 前是“分”, 后是“点”, past或to立中间; past加, to要减。如果表示“几点半”, 要用half past加钟点。一、基数词与序数词单项选择(B
7、)1. (2021泸州中考)When was the Communist Party of China founded? In 1921. Its her birthday this year. A. hundredB. hundredthC. hundreds ofD. the hundredth(D)2. (2021铜仁中考)There are floors in this building. He lives on thefloor. A. thirty; nineB. thirtieth; nineC. thirtieth; ninthD. thirty; ninth(B)3. (20
8、20吉林中考) On my birthday, my aunt gave me a nice dress as a present. A. nineB. ninthC. the ninth(D)4. (2020丹东中考)The words from Page 1 to Page 3 are very clear. But the ones on the page are not. A. firstB. twoC. threeD. fourth用所给词的适当形式填空, 完成句子5. (2020云南中考) Nick gave his mother a scarf on her fortieth(f
9、orty) birthday. That made her very happy. 6. (2020上海中考) Uncle Andy tried ten(tenth) different jobs, and finally chose to be a lawyer. 7. (2021龙东中考)Well hold many activities to celebrate our countrys seventy-second(seventy-two) birthday this year. 一、判断“基数或序数”, 后面的名词可帮助! 1. 后面的名词是复数形式, 多数用基数词。(如2, 6)2
10、. 后面的名词是单数形式, 多数用序数词。(如1, 2, 3, 4, 5, 7)3. 定冠词the后的数词, 多数用序数词。(如2, 4)【语法心得】_二、数词的应用(B)1. (2020恩施中考)Among all these books, of them are for children to read. A three fifthB. three fifthsC. threes fifth(A)2. (2021绥化中考)My aunt became a nurse in her and she still loves her job now . A. twentiesB. twentiethC. twenty二、语境分析法辨“数词”根据上下文语境首先确定数词在句中表示数量还是表示顺序; 然后再确定数词的形式。(如1, 2)关闭Word文档返回原板块