1、数 词,数词的定义 数词是表示数目多少或先后顺序的词,有基数词和序数词两种。表数量的数词叫基数词，如one, two, three,表顺序的数词叫序数词，如first, second, third, fourth, fifth,.,基数词 构成 1）112单独记one, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve 2)1319词尾为-teen：thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen 3)2090逢整十词尾为
2、-ty：twenty, thirty, forty, fifty,. 4)21 99在十位数和个位数之间加连字符构成，如：73 seventy-three, 88 eighty-eight,5)101 999先说几百，再加and,再加末尾两位数，如：178 one hundred and seventy-eight 6)1000以上的数词，先从后向前数，每三位用一个数逗点“，”隔开。第一个“，”是thousand千，第二个“，”是million百万，第三个“，”是billion美语中的十亿（英国用thousand million），然后一节一节地用几百几十几的方法来数。,基数词的使用 基数词可
3、在句中作主语、表语、定语、状语、介宾、同位语。 Two of them are students.主语 Two and two are four. 表语 We two joined the army.同位语 Two thousand people were present at the meeting.定语,基数词使用的注意事项 1）hundred, thousand, million, billion, score(20),dozen(12)前有数词表示具体数目时，这些词不加“s”。当其前无具体数词时，这些数词要加“s”后再加of 连接名词，来表示不具体的量。 如：five hundred
4、people, two score apples, hundreds of people, scores of pears, thousands of, thousands and thousands of, tens of thousands of, millions of, a few hundred men, many thousands of men, some/several million(s of) men,2)表示“几十”的数词的复数形式前用形容词性物主代词修饰可用来表示“在某人十几岁时”；用定冠词修饰表示“年代”。 in ones early twenties (thirti
5、es) 在某人二十（三十）几岁时 the 1840s/the 1840s 19世纪40年代 the 1980s/the 1980s 20世纪80年代,十亿以上的大数，英美有不同的表示：英国英语 美国英语 十亿thousand million one billion 百亿ten thousand million ten billion 千亿hundred thousand million one hundred billion 万亿one thousand billion one trillion,年代的读法:297读作two ninety-seven或two hundred and ninet
6、y-seven1908读作nineteen and eight或nineteen o eight或nineteen hundred and eight1949读作nineteen forty-nine或nineteen hundred and forty-nine2000读作two thousand,3)a.在美国英语中，表示几点过几分可用after,表示几点差几分可用before。如12点10分：ten after twelve。11点50分：ten before twelve。 b.若想表明是上午，可在时间后加上am或a.m. (a.m.是拉丁语ante meridiem的缩写，意为“上午
7、”)，若想表明是下午，可在时间后加上pm或p.m. (p.m.是拉丁语post meridiem的缩写意为“下午”)。a.m.或p.m.前若是整点，用了a.m.或p.m后，不再用oclock，也不可加 “：00 ”。如：at 8 a. m.（上午8点），at 5 p. m.（下午5点）。,c.表示“点整”时，用sharp。如: at nine oclock sharp（九点整），at 23:00 sharp（二十三点整）。,4)年龄表达表示“岁” He is eighteen (years old). He is aged eighteen. He is at the age of eight
8、een. His age is eighteen.表示“快满岁”He will be eighteen years old. He is going on eighteen years old. He is getting on for eighteen.It will be his eighteenth birthday.,表示“不满岁” He is barely/nearly/almost eighteen. He is not quite/yet eighteen. He is under/below eighteen. 表示“已经岁”可用以下方法表示： He is past/over/
9、above eighteen. He is more than eighteen. He has turned eighteen.,表示大概年龄时用“in ones +基数词复数形式”结构。 a.从十三岁到十九岁，用in ones teens . b.二十岁以上就用in ones twenties/thirties/forties/ fifties / nineties，还可以借助early，middle，late来表达得更明确一些。,序数词 基数词变为序数词,记忆口诀 一二三要单独记：onefirst, two second, three third th要从四加起：four fourth,
10、 five fifth,. eight少个t：eight eighth nine去掉e：nine ninth ve用f来代替：five fifth, twelve twelfth ty变成tie：twenty twentieth 表第“几十几”，基数加序数记心里： twenty-onetwenty-first,序数词的使用 1. 序数词在句中主要作定语，一般情况下序数词前要加定冠词。 Monday is the second day of a week. 星期一是一周的第二天。 2. 序数词前有时加不定冠词，表示“又一、再一”，相当于another。 Would you like a seco
11、nd cup of tea? 你还想再来一杯茶吗？ I had a fourth apple.我(吃了三个苹果后)又吃了一个苹果。,3. first, second等有时可表示一批人或物。The first milu deer came from China in the 1860s.最早的麋鹿是在十九世纪六十年代来自中国的。 4. 有时序数词作状语，不加冠词。He came out first in the contest. 他在比赛中获得第一名。 5. first, second等在用来指“冠军、亚军”等获胜名次时也常不加冠词。 He is first.他是冠军。,数词的使用 一、 百分数
12、、分数、小数的构成及用法 1)百分数：基数词加百分号（percent）: 89%eighty-nine percent 2)分数：分子基数词，分母序数词。分子大于1，分母用复数。1/3: one third, 2/5: two fifths,3)带分数：基数词 + and +分数表达： : five and six-sevenths 注意 1/2: a half, one half 1/4: one-fourth, one /a quarter3/4: three quarters1/3: a third(33.33r %读作 thirty-three point three three re
13、curring percent) 4）小数：小数点读作“point”，数字一律用基数词1.45: one point four five,5)通常分数、百分数、小数作定语。“分数（百分数）（of） +名词”作主语时谓语动词是根据名词确定的，名词为单数动词即用单数，名词为复数动词即用复数动词。50% apples are here.One third apple is eaten. one and a half后的名词用复数，谓语动词一般用单数，不过事实上也可用复数。,倍数表达表示倍数时，一倍用once，两倍用twice，三倍以上用“基数词+times”。1.常用句式： .times+ 形容词/
14、副词的比较级than. .times as+形容词/副词原级+as+.,times the size/length/height/width/.of+ n.表示 Li Ming runs twice faster than Lily.The river is three times longer than that one.= The river is four times as long as that one.Our classroom is four times as big as yours.= Our classroom is three times bigger than your
15、s.The new building is four times the size of the old one,2.有时我们用这三个句型的变体 1)“.times as many/much + n. + as + n.”或 “.times as much/many as + n.” We have produced twice as many cars this year as we expected. 我们今年生产的汽车是预期的两倍。 There are four times as many books in our library as in theirs.我们图书馆的书是他们图书馆的四
16、倍。 The price of this product is twice as much as that of the previous one. 该产品的价格是前一种的两倍。,2) .times +more+名词+than+被比较对象He earns five times more money than he did ten years ago.他现在挣的钱是十年前挣的五倍。 3) .times +that of +被比较对象The size of the newly broadened square is four times that of the previous one. 新扩建的
17、广场是以前的四倍大。 The hospital charges three to five times that of ordinary ones 这家医院的收费是一般医院的三至五倍。,4) .times + what从句The worlds population has grown to more than six times what it was in 1800. The figure is now approaching 6.5 billion people. 目前的世界人口与1800年相比已经增长到那时的六倍多，这个数字现在将近65亿。The price of the meat is
18、 now double/twice what it was last year. 现在的肉价是去年的两倍。,5) .times +over或up to The grain output in that province is twice over that of 2002. 那个省的粮食产量是2002年的两倍。 He is three times up to your age. 他的年龄是你的三倍。 6) .times +compared with+被比较对象 The number of computer imports has increased four times compared wi
19、th last year. 计算机的进口量与去年相比增加了四倍。,7)用分数、百分数来表示倍数。 The box is one-third bigger than that one. 这个盒子比那个盒子大三分之一。 Last year the output value of industry was 30 percent higher than that of 2003. 去年工业产值比2003年增长了30%。,3.用其他方式来表示倍数 Im twice/double his age. 我的年龄是他的两倍。 The top-brand clothes are often sold as dou
20、ble the normal price here. 这里名牌衣服的售价经常比正常的售价高一倍。 Ive paid five times the usual price for the stamp.我出了五倍于往常的价格买这枚邮票。,模糊概数表达法 绝大多数数词在指明事物的数目时，是不考虑自身的数的，但有些数词也有单数和复数形式。 1.当hundred，thousand，million，billion前面有基数词时，用单数形式，词尾不加-s；前面有many， several，a few修饰时，仍用单数形式：several billion years 2.表示概数时，用ten, hundred,
21、 thousand, billion的复数形式加of,后面接复数名词。 thousands of lakes and forests,3.强调数目众多时，可将tens, hundreds, thousands等用of, and或upon连接。 tens of thousands of 几万 hundreds of thousands of 几十万 hundreds and hundreds of 成百上千的 thousands upon thousands of 成千上万的,4.dozen和score表示具体数目，也可表示模糊概数 1)dozen和score表示具体数目与基数词连用时,doze
22、n和score用单数形式。two dozen pencils, three score years 2)dozen表示具体数目时，不加-s也不用of: two dozen eggs。但后接代词、指示代词（these/those等）或所接的名词前有限定词，就要加of: a dozen of these books一打这样的书, a dozen of us 我们中的十二个人,3) score表示具体数目时，不加-s，但可用of。a score of eggs二十个鸡蛋 ten score of books 200本书 4) dozen和score表示模糊概数时，加-s并加of。dozens of
23、people几十个人 scores of times几十次,约数表达法 1.“许多；很多；大量”的表达在英语中，表示“许多，很多，大量”含义的单词除了many和much以外，还有许多较常用的词组。 1)只接可数名词复数的有several, (a good/great) many, hundreds of, a (large/good/great) number of, numbers of, few, a few, quite a few, not a few等。,2)只接不可数名词的有little, a little, quite a little, an amount of, amount
24、s of, a good/great deal of, a large sum of 等。 3)既可接可数名词复数也可接不可数名词的有some, any, all, none, enough, plenty of, a lot of, lots of, a (large) quantity of, quantities of, a diversity of, diversities of, a variety of, varieties of, a world of, a wealth of 等。,2.表示“多于，超过”用more than或over 3.表示“少于”用less than 4.
25、表示“或以上”用or moreLiterally，multimedia means two or more media. 从字面上看，多媒体是指两种或两种以上的媒体。 5.表示“或以下”用or lessThe whole procedure will take perhaps only five minutes or less. 整个过程只需5分钟甚至更少的时间。,6.表示“大约”用about, around, some等。Horseracing can be traced to the Olympic Games of about 600 BC. 赛马可追溯到大约公元前600年的奥运会。So
26、me 844 animals and plants have disappeared in the last 150 years. 大约有844种动植物在过去的150年里消失了。I need around 300 dollars.我需要300美元左右。,7.表示“左右”用or so Please leave us for five minutes or so，and we have some private business to deal with. 请你先回避五分钟左右，我们有些私事要处理。,数词的特殊用法 1.every和数词连用可表示“每隔；每逢” ，在基数词后用复数可数名词，在序数词
27、后用单数可数名词。结构有四个：a. “every other/second +单数名词” 表 “每隔一”Please write on every other line.请隔行书写。b. “every +基数词+复数名词”He comes here every four days.他每隔三天来此一次。,c. “every +序数词+单数名词”He comes here every fourth day.他每隔三天来此一次。 d. “every few +复数名词”Please plant a tree every few meters.请每隔几米栽一棵树。,2.基数词可用来构成复合形容词。1)
28、基数词+名词：ten-minute十分钟的two-thousand-word两千词的2)基数词+名词的-ed形式five-storied五层的, one-eyed 独眼的3)基数词+名词+形容词five-month-old五个月大的, six-meter-long六米长的,3.基数词用在一些短语中a month or two一两个月，leave by ones and twos零零落落地离开，in twos and threes三三两两地Ten to one youll miss your flight.你很可能要赶不上班机了。Shes all at sixes and sevens abou
29、t what to do.她心里七上八下，不知该怎么办。,编码的表示法在表示有顺序号的事物时可用基数词，也可用序数词。如数字较长，避免使用序数词。序数词放在名词前, 并加定冠词；基数词放在名词后，名词不加冠词。lesson one, the first lesson , Room 521, bus No. 2,其他 1)固定用法at sixes and sevens乱七八糟 one at a time一次一个地one by one一个一个地 by the dozen以打计by the hundred以百计 in tens十个十个地in five hundreds五百五百地 2)表示比例可用in
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