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ID:52992640
大小:4.61 MB
页数:21页
时间:2020-04-09
《初中英语数词讲解和练习.pptx》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
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。基数词序数词略数年代数词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263fifty-three,thirty-twotwohundredandsixty-two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:tenmillionon
2、ehundredmilliononebillion英语数量单位one个ten十hundrend百thousand千million百万billion十亿2.序数词基数词→序数词:one→firsttwo→secondthree→third大部分基数词都在后面加th注意:five→fifthnine→ninthtwelve→twelfth注意:整十的基数词(10除外),均将y变成ie,再加th:twenty→twentiethfifty→fiftieth表示二十以上的基数词只变个位数(整十除外):thirty-one→thrity-first3.略
3、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Thereisonlyhundredsofstude
4、nts我们学校只有几百个学生tthreehundredstudents三百个学生twothousandbooks两千本书hundredsofstudents三百个学生thousandsofbooks两千本书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Thereare__________(两千)studentsinourschool.TheGreatWallismadeof________stones.长城是由数百万石头砌成的twothousandmillionsof注意:若表示特定的数目,可在hundred、thousand后加ofThe
5、rearesevenhundredstudentsinthisschool.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.4.年代表达法在20世纪90年代:inthe1990s或inthe1990’s具体年份:in+年份in1994把基数词改为序数词。onetwelvetwofourteenthreetwentyfivetwenty-oneeightforty-
6、fournineninety-sixfirstsecondthirdfiftheighthninthtwelfthfourteenthtwentiethtwenty-firstforty-fourthninety-sixth22.Januaryis_______monthoftheyear.A.oneB.theoneC.firstD.thefirst23.Thereare_______daysinayear.A.threehundredssixty-fiveB.threehundredandsixty-fiveC.thethirdhundred
7、sixty-fiveD.thirdhundredandsixty-five24.Thecomputerwascheap.Ispentonlytwo_______yuanonit.A.thousandsB.thousandC.thousandsofD.thousandof25.Pleaselookatthefollowingfourpicturesandwritea_______storyaboutthem.A.one-hundred-wordB.one-hundred-wordsC.one-hundreds-wordD.one-hundreds
8、-wordstwo-thousand-student两千个学生26.—Onwhichfloordoyoulive?—The_______floor,a
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