《初中英语数词ppt课件.ppt》由会员分享,可在线阅读,更多相关《初中英语数词ppt课件.ppt(22页珍藏版)》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。
1、数词复习数词复习2数数词词基数词基数词 序数词序数词数量数量顺序顺序一.基数词的构成 1)112, 独立成词。独立成词。 one two three four five six seven eight nine ten eleven twelve 2)13-19, 由由39 + teen构成。构成。 14fourteen 16-sixteen 17-seventeen 19nineteen 特殊拼写特殊拼写: 13 thirteen 15-fifteen 18eighteen 3)2090, 以以-ty结尾。结尾。 20twenty 30thirty 40forty 50fifty 80eig
2、hty 60sixty 70seventy 90ninety 4)2199, 两位数,十位与个位之间有两位数,十位与个位之间有 “”。 21 twenty-one 55 fifty-five 99 ninety-nine 5)101999,三位数,百位与十位,三位数,百位与十位/个位之间加个位之间加 and。 101 one hundred and one 840 eight hundred and forty 693 six hundred and ninety-three 29,43150076,thousandhundredmillionbillionand6) 1,000以上数目以上数
3、目,从右向左每三位用从右向左每三位用“,”分开分开,分别读为分别读为thousand , million, billion, 注意:注意:这几个词不能用复数形式,后也不这几个词不能用复数形式,后也不能加能加andand。 7)表示具体、准确的数目时,hundred, thousand, million等数词后不能加-s, 如five hundred, six thousand, seven million8)当hundred, thousand等数词与of连用,表示不具体、不准确的数目时,词尾须加-s。如:thousands of students, millions of trees.二、基
4、数词的用法二、基数词的用法1、表示表示具体具体数目数目,hundred, thousand, million不用复数不用复数 表示表示不确定不确定数目数目,用用复数。复数。即即hundreds of(数百数百), thousands of(数千数千), millions of(数百万数百万)+ 名词复数名词复数, 可以用可以用many/several修饰,但不能与具体数目连用。修饰,但不能与具体数目连用。 1) Our country has a population of 1,300 million people. 2) There are three thousand students i
5、n our school. 3) After the war, thousands of people became homeless. 4) Several / Many thousands of trees must be planted every year.2、 “几十几十”的复数形式可以表的复数形式可以表示:示: 几十多岁几十多岁 - in + ones + 数词复数数词复数如:如: He is in his forties 他四十多岁他四十多岁 3、“基数词基数词+名词名词” 的的合成形容词合成形容词作定语,作定语, 中间有连字符中间有连字符“”,当中的名词用当中的名词用单数单数。
6、(“数数 单名单名 ”作定语。)作定语。) a 3 year old girl a seven-day holiday 5:156:45a quarter分钟逢分钟逢15即即 一刻钟一刻钟4:40(60-分钟)分钟) + to +(小时(小时 + 1)30分钟分钟7:50按顺序读基数词按顺序读基数词简化法简化法3:30half + past + 小时小时= 30 分钟分钟2:10分钟分钟 + past +小时小时 30分钟分钟1:00基数词(基数词(+ oclock) 整点整点读法读法例例表示法表示法时间类型时间类型one oclockten past twohalf past threetw
7、enty to fivea quarter past fivea quarter to sevenseven fifty三、序数词的构成三、序数词的构成1) 13, first, second, third 。2) 419, 相应基数词+th, 特殊拼写:fifth, eighth, ninth, twelfth。3) 2090, y变成ie +th,如twentieth。4) 2199, 只把个位的基数词变成序数词 如twenty-first。5) 序数词缩写数字最后两字母 如1st, 2nd, 3rd ,4th基变序基变序,有规律有规律,一、二、三,特殊记,面目全非要注意,一、二、三,特殊
8、记,面目全非要注意,加加th从从4起,起,八少八少“t”,九去,九去“e”,“ve”要用要用“f”替,替,(five, twelve)见见“y”变成变成“i”和和“e”,词尾加上,词尾加上“th”,(twenty, thirty,ninety)若是遇到几十几,只变个位就可以。若是遇到几十几,只变个位就可以。序数词缩写记清楚序数词缩写记清楚,数字后跟两字母。数字后跟两字母。(序数词构成规律)(1)序数词作定语,前面要加序数词作定语,前面要加the; The first truck is carrying a food basket John lives on the fifteenth floo
9、r She is my first English teacher.(2)有时加有时加a/an,“再一再一”,“又一又一” 的意思的意思Well have to do it a second time Shall I ask him a third time? When I sat down,a fourth man rose to speakThey had a second child in 1988四、序数词的用法四、序数词的用法五、数词的用法五、数词的用法 1、编号表示法、编号表示法编号在前,名词在后,用序数词,前面有the编号在后,名词在前,用基数词,注意首字母大写房间号码和电话号码
10、要一个一个分别读The First LessonThe First Lesson(在句子中不大写)(在句子中不大写)Lesson One Lesson One the thirty-second pagePage 32 / Page Thirty-twoRoom 305Room 305Bus No.12第一课第一课第第32页页第第305房间房间第第12路公共汽车路公共汽车1/4 one-fourth a (one) quarter3/4 three-fourths three quarters 2/3 two-thirds 1/2 a (one) half 半年 half a year 半小时
11、 half an hour一年半 one and a half years one year and a half分数修饰名词时,后用of短语。如:1/3 one third of teachers 3/7 three sevenths of the boys2.分数表示法分数表示法分子用基数词,分母用序数词。分子大于1时,分母加-s。1999 nineteen ninety-nine2008 two thousand and eight1949年10月1日 读作: October (the) first, nineteen forty-nine (月-日,年) the first of Oc
12、tober, nineteen forty-nine(日-月,年)写作: October 1st,1999(日用缩写,月-日-年) October 1, 1999 (日用数字) 1st October,1999日-月,年3.年份、日期、时刻表达法年份、日期、时刻表达法年用基数词表示,两位一读,介词用in日用序数词表示,介词用on 表示“在世纪”, 用序数词。 在20世纪 写作:in 20th century 读作:in the twentieth century “时刻”用基数词表达,同时要注意以下两点。 1.表示“整点”时,在基数词后加oclock; 9:00 oclock. 2.分钟小于或
13、等于30分钟的,用“分钟数past钟点数”形式;分钟数大于30分钟的,用“到下一个钟点所差的分钟数to下一个钟点数”形式,也可以依次读钟点数和分钟数。 7:20 twenty past seven或seven twenty. 3.注意两个特殊的表示时间的单位词:30分钟用half,15分钟用a quarter,如: 6:30 读作:half past six 5:45 读作:a quarter to six 6:15 读作:a quarter past six4.“基数词名词形容词”结构 “基数词名词形容词”只能用来放到名词前作定语。如: She is a 3-year-old girl. T
14、hey live in a 7-storey-high building. 注:这种结构中名词不能用复数,同时只能作定语。用作表语时,不用连字符,名词有复数。如: Tony is 10 years old this year. Tony is a 10-year-old boy.1440501505177090119188021601161/21/31/424/25 3/43three fourths / three quartersone third /a thirdtwenty-four twenty-fifthsthree and six sevenths one quarter /a
15、quarter/ one fourtha halfCan you read a fraction? What is the time? six/six oclock four o five/ five past four seven fifteen/a quarter past seven nine twenty/ twenty past nine nine thirty/half past nine six forty/twenty to seven1. Dick, it is the _ time in _ days that youve made the same mistake.A.
16、two, three B. second, three C. two, third D. second, third (2007乌鲁木齐)B2. It is said that the gravity(引力) on Mars is only about _ of the gravity on earth.A.threeeighths B. thirdeighthC. threeeights D. thirdeightAHow many people will come to Beijing next year?Its hard to say, _ people, I think.A.million of B. millions ofC. three millions D. three millions ofB