初中英语数词讲解PPT幻灯片

中考英语知识点,数词,1,数词,基数词,序数词,数量,顺序,2,基数词的构成,1）112,独立成词。onetwothreefourfivesixseveneightnineteneleventwelve2）13-19,由39+teen构成。14fourteen16-sixteen17-seventeen19nineteen特殊拼写:13thirteen15-fifteen18eighteen3）2090,以-ty结尾。20twenty30-thirty40forty50fifty80-eighty60-sixty70-seventy90ninety4）2199，两位数，十位与个位之间有“”。21twentyone55fiftyfive99ninetynine5）101999，三位数，百位与十位/个位之间加and。101onehundredandone840eighthundredandforty693sixhundredandninety-three,3,29,431,500,7,6,thousand,hundred,million,billion,and,6)1，000以上数目,从右向左每三位用“，”分开,分别读为thousand,million,billion,基数词的构成,4,序数词的构成,基数词变序数词的方法：基变序，有规律；词尾要加th。一二三，特殊记；词尾分别tdd。八去t，九去e；ve则以f替。ty则变作ti;后面还有一个e。要是遇到几十几；只将个位变成序。eg.onefirsttwosecondthreethirdeighteighthnineninthtwelvetwelfthtwentytwentiethtwenty-one-twenty-first,5,数词的应用,一.时刻表达法：(介词用at）1.整点：基数词+oclockeg.Itseightoclocknow.2.几点几分：.直接表达法：先小时后分eg.3:25threetwenty-five.间接表达法：先分后小时1)(30分钟)用to：(60-分钟数)to(小时数+1)eg.3:35twenty-five(minutes)tofour3)30分钟=half15分钟=aquartereg.3:30threethirty=halfpastthree3:15threefifteen=aquarterpastthree.3:45threeforty-five=aquartertofour,6,数词的应用,二.日期表达法：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on1999nineteenninety-nine2008twothousandandeight1949年10月1日读作:October(the)first,nineteenforty-nine(月-日，年)thefirstofOctober,nineteenforty-nine（日-月，年）写作:October1st,1999(日用缩写，月-日-年)October1,1999(日用数字)1stOctober,1999日-月，年2.表示“在世纪”,用序数词在20世纪写作：in20thcentury读作：inthetwentiethcentury,7,数词的应用,三.表编号编号在前，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要一个一个分别读第一课第32页第305房间第12路公共汽车,BusNo.12,TheFirstLesson（在句子中不大写）LessonOne,Thethirty-secondpagePage32/PageThirty-two,Room305,8,数词的应用,四.分数的表达：分子（基数）、分母（序数）eg.onethird三分之一twothirds三分之二注意：1.分子超过1时，分母加s2.含分数的短语作主语由分数后的词决定谓语eg.1)Onethirdofthestudentsaregirls.2)Onethirdofthemilkismine.3.分数的特殊形式1)onethird=athird2)onefourth=aquarterthreefourths=threequarters3)onesecond=ahalf半年halfayear半小时halfanhour一年半oneandahalfyearsoneyearandahalf,9,五.序数词作定语，前面要加the；ThefirsttruckiscarryingafoodbasketJohnlivesonthefifteenthfloorSheismyfirstEnglishteacher.(2)有时加a/an，“再一”，“又一”的意思WellhavetodoitasecondtimeShallIaskhimathirdtime？WhenIsatdown，afourthmanrosetospeakTheyhadasecondchildin1988,数词的应用,10,六.表示具体数目,hundred,thousand,million不用复数表示不确定数目,用复数。即hundredsof(数百),thousandsof(数千),millionsof(数百万)+名词复数,可以用many/several修饰，但不能与具体数目连用。1)Ourcountryhasapopulationof1,300millionpeople.2)Therearethreethousandstudentsinourschool.3)Afterthewar,thousandsofpeoplebecamehomeless.4)Several/Manythousandsoftreesmustbeplantedeveryyear.,数词的应用,11,七.其他“几十”的复数形式可以表示：几十多岁-in+ones+数词复数年代-in+the+数词复数1)Hediedinhisforties四十多岁2)Inthenineties,mostpeoplegotoworkbybike.90年代3、“基数词+名词”的合成形容词