【英语】2018届二轮复习数词学案（3页）

【英语】2018届二轮复习数词学案（3页）

‎2018届 二轮复习 数词 学会了one, two, three, four, five…还远远不够哦！ 百分之八怎么说？二分之三怎么说？四倍又怎么说？英语数词有着许多自己的小规律咧~ ‎ 数词的定义：表示数目多少或顺序多少的词叫数词，数词分为基数词和序数词。表示数目多少的数词叫基数词;表示顺序的数词叫序数词。‎ ‎1.基数词 ‎1.1基数词的构成 ‎ ‎ (1)1-20‎ ‎　　one,two,three,four,five,six,seven,eight,nine,ten,eleven,twelve,thirteen,fourteen,fifteen, sixteen, seventeen, eighteen, nineteen, twenty ‎　　(2)21-99 先说“几十”，再说“几”，中间加连字符。‎ ‎23→twenty-three,34→thirty-four,45→forty—five,56→fifty-six,67→sixty-seven,78→seventy-eight,89→eighty-nine,91→ninety-one ‎　　(3)101—999先说“几百”，再加and,再加末两位数或末位数;‎ ‎　　586→five hundred and eighty-six,803→eight hundred and three ‎　　(4)l,000以上,先从右往左数，每三位数加一个“,”,第一个“,”前为thousand.第二个“,”前为 ‎　　million,第三个“,”前为billion(美式)或thousand ,million(英式),然后一节一节地表示。‎ ‎　　1,001→one thousand and one ‎　　9,785→nine thousand, seven hundred and eighty-five ‎　　18,423→eighteen thousand, four hundred and twenty-three ‎　　6,260,309→six million two hundred and sixty thousand three hundred and nine ‎　 750,000,000,000→seven hundred and fifty, billion(美式) seven hundred and fifty thousand million(英式)‎ ‎1.2.基数词的用法 ‎　　(1)作主语 ‎　　eg.Four Of them come from Paris.‎ ‎　　(2)作宾语 ‎　　eg.一 How many books would you like?‎ ‎　　一I would like two.‎ ‎　　(3)作表语 ‎　　eg.Seven minus two is five.‎ ‎　　(4)作定语 ‎　　eg.There are three people in my family•‎ ‎　　(5)作同位语 ‎　　eg. You two will go swimming with us.‎ ‎　　(6)表具体数字时,hundred, thousand ,million用单数。‎ ‎　　eg. There are six hundred students in our grade.‎ ‎　　(7)表不确定的数字时,数词用复数。若带名词，再加of。 hundreds of(数百,成百上千的),thousands of(数干,成千上万的),millions of(数百万)two thousand (两千)‎ ‎　　Thousands and thousands of people have visited the city.成千上万的人参观了这座城市。‎ ‎　　(8)在一些表示“一排”或“一组”的词组里;‎ ‎　　eg, They arrived in twos and threes.他们三三两两地来了。‎ ‎　　(9)表示“…十”的数词的复数可以表示人的岁数或年代。‎ ‎　　eg. He is in his early thirties.他有三十来岁(31—34岁)：‎ ‎　　This took place in the 1930s.这事发生在二十世纪三十年代;‎ ‎　　(10)表示时刻 ‎　　钟点表达法。‎ ‎　　顺读法(钟点+分钟) 如：4:30 four thirty 4:45 four forty-five 4:15 four fifteen 倒读法(分钟+to/past+钟点)‎ ‎　　如：4:30 half past four ‎　　4:15 fifteen past four/a quarter past four 4:45 fifteen to five/a quarter to five ‎　　eg.I watch CCTV News at seven o’clock every evening.‎ ‎　　(11)表示百分数 ‎　　百分数的表达方式是：基数词+ percent(单数形式)+of+名词。如：‎ ‎　　Thirty percent of the students in my class are from cities. 我班30%的学生来自城市。‎ ‎　　About 61 percent of the surface is covered by water. 大约61%的表面被水覆盖着。‎ ‎　　(12)小数的读法：小数点读作"point"，小数后各位数要分别读， 小数点前的数若为"0"可略去不读。‎ ‎　　Examples： 2.468 读作：two point four six eight ‎　　0.157 读作：(zero)point one five seven ‎2.序数词 ‎ 2.1.序数词的构成 ‎　　(1)一般在基数词后加th ‎　　eg. four→fourth, thirteen→thirteenth ‎　　(2)不规则变化 ‎　　one→first, two→second, three→third, five→fifth, eight→eighth,‎ ‎　　nine→ninth, twelve——twelfth ‎　　(3)以y结尾的十位整数，变y为ie再加th ‎　　twenty→twentieth, forty→fortieth, ninety→ninetieth ‎　　(4)从二十一后的“几十几”直至“几百几十几”或“几千几百几十几”只将个位的基数词变为序数词。‎ ‎　　twenty-first, two hundred and forty-fifth ‎2.2.序数词的用法 ‎　　(1)序数词作定语时，一般要与定冠词或物主代词连用。‎ ‎　　eg. Tom is their second son.‎ ‎　　He is the first one to come here.‎ ‎　　(2)序数词有时可与不定冠词连用，表示数量上“又—”,“再一”‎ ‎　　eg： He tried a second time.他又试了—次。‎ ‎　　Shall l ask him a third time? 还要我再问他—次吗?我已问了他两次)‎ ‎　　(3)序数词的缩写形式为：阿拉伯数字加上这个词的末尾两个字母。‎ ‎　　1st 2nd,3rd,4th,20th,21st,22nd,23rd ‎　　(4)表示年、月、日时，年用基数词，日用序数词。‎ ‎2005年8月15日：(英)15, 8, 2005=15th, August,2 005;(美)8,15,2005=August 15th,2005‎ ‎3.基数词和序数词都可以用来给数字编号 The first lesson=Lesson Two(第二课)‎ ‎　　第305房间：Room three o(零)five ‎　　长安街76号：seventy-six Changan Street ‎　　电话号码：204-2244：telephone number two o(零) four two two(double two four four ‎　　十一路公共汽车：Bus(No.) eleven ‎4.分数的表达 分子用基数词，分母用序数词，分子大于1时，分母加s ‎　　eg.1/3-one third;2/5-two fifths ‎　V.数学运算的表达 eg.3+5=8 Three plus/and five is eight.‎ ‎　　9-2=7 Nine minus two is seven.‎ ‎　　6x5=30 Five times six is thirty /six unutilized five is thirty.‎ ‎8÷2=4 Eight divided by two is four.‎ VI.倍数表示法 ‎ a. 主语+谓语+倍数(或分数)+ as + adj. + as ‎　　I have three times as many as you.　我有你三倍那么多。‎ ‎　　b. 主语+谓语+倍数(分数)+ the size (amount，length…) of…‎ ‎　　The earth is 49 times the size of the moon.　地球是月球的49倍。‎ ‎　　c. 主语+谓语+倍数(分数)+ 形容词(副词)比较级+ than…‎ ‎　　The grain output is 8 percent higher this year than that of last year.‎ ‎　　今年比去年粮食产量增加8%。‎ ‎　　d. 还可以用by+倍数，表示增加多少倍 ‎　　The production of grain has been increased by four times this year.‎ 今年粮食产量增加了4倍。‎