初中英语数词讲解和练习ppt课件

.,1,数词,英语中的数词可分为基数词和序数词两大类。基数词：人或事物的数目序数词：数目的顺序。,.,2,基数词,序数词,略数,年代,数词,.,3,1.基数词,巧记基数词口诀1至12分别记13至19都带-teen13，17整十后面要用-ty40，,90几十几用连字符53，32百位以上and连263,fifty-three,thirty-two,twohundredandsixty-two,.,4,注意：,英语中没有“万”和“亿”这两个数量单位，要按十进位法来推算。一万：tenthousand十万：onehundredthousand百万：onemillion千万：一亿：十亿：,tenmillion,onehundredmillion,onebillion,.,5,英语数量单位,one个ten十hundrend百thousand千million百万billion十亿,.,6,2.序数词,基数词序数词：onefirsttwosecondthreethird大部分基数词都在后面加th注意：fivefifthnineninthtwelvetwelfth,.,7,注意：,整十的基数词（10除外），均将y变成ie，再加th：twentytwentiethfiftyfiftieth表示二十以上的基数词只变个位数（整十除外）：thirty-onethrity-first,.,8,3.略数表达法,1.当hundred，thousand，million，billion，dozen等前面有具体的数词时，后面既不能加s，也不能加介词of。Ourschoolboughttwothousandbooksthisyear.我们学校今年买了两千本书,.,9,2.hundred，thousand，million，billion，dozen等前面没有具体的数词，则在其后加s和介词of，表不确定的数量或形容数量之多hundredsof成百的，好几百thousandsof数以千计的millionsof数百万的Thereisonlyhundredsofstudents我们学校只有几百个学生t,.,10,threehundredstudents三百个学生twothousandbooks两千本书hundredsofstudents三百个学生thousandsofbooks两千本书,.,11,几百万个人两百个苹果三千个箱子几千个杯子三百万棵树,.,12,Thereare_（两千）studentsinourschool.TheGreatWallismadeof_stones.长城是由数百万石头砌成的,twothousand,millionsof,.,13,注意：,若表示特定的数目，可在hundred、thousand后加ofTherearesevenhundredstudentsinthisschool.Threehundredofthemaregirls.该校有700名学生，其中女生有300名。长乐有六百万人，其中400万是男性。,Changlehassixmillionpeople.Fourhundredofthemaremen.,.,14,4.年代表达法,在20世纪90年代：inthe1990s或inthe1990s具体年份：in+年份in1994,.,15,把基数词改为序数词。onetwelvetwofourteenthreetwentyfivetwenty-oneeightforty-fournineninety-six,first,second,third,fifth,eighth,ninth,twelfth,fourteenth,twentieth,twenty-first,forty-fourth,ninety-sixth,.,16,22.Januaryis_monthoftheyear.A.oneB.theoneC.firstD.thefirst23.Thereare_daysinayear.A.threehundredssixty-fiveB.threehundredandsixty-fiveC.thethirdhundredsixty-fiveD.thirdhundredandsixty-five24.Thecomputerwascheap.Ispentonlytwo_yuanonit.A.thousandsB.thousandC.thousandsofD.thousandof,.,17,25.Pleaselookatthefollowingfourpicturesandwritea_storyaboutthem.A.one-hundred-wordB.one-hundred-wordsC.one-hundreds-wordD.one-hundreds-words,two-thousand-student两千个学生,.,18,26.Onwhichfloordoyoulive?The_floor,andmyroomnumberis_.A.fifth;fivezerotwoB.fifth;fivezerosecondC.five;fivezerosecondD.five;fivezerotwo27.Inourcitypeoplehavemovedintotheirnewhouses.A.thousandB.thousandsC.thousandsofD.manythousand,.,19,28.Now,turntopage_andlookatthe_pictureinLessonTwo.A.twentieth,oneB.twenty,oneC.twentieth,firstD.twenty,first29._girlstookpartintheSuperGirlCompeti