初三英语语法-4-数词 5页

初三英语语法-4-数词本文由永恒天女贡献ppt文档可能在WAP端浏览体验不佳。建议您优先选择TXT，或下载源文件到本机查看。初三英语语法数词数词:定义:用来表示人或物的数量的名词分类:数词有基数词序数词两种.分类:数词基数词和序数词基数词序数词英语的数词可以作句子的主语,宾语,表语和定语.基数词:基数词.基数词:表示数目的词叫基数词基数词英语中常用的基数词有:1-one2-Two3-Three4-Four5-Five6-Six7-Seven8-Eight9-Nine1010-ten1111-Eleven1212-Twelve1313-Thirteen1414-Fourteen1515-Fifteen1616-Sixteen1717-Seventeen1818-Eighteen1919-Nineteen20-Twenty203030-Thirty4040-Forty5050-Fifty6060-Sixty70-Seventy708080-Eighty9090-Ninety100100-one(a)hundred23-twenty23-twenty-three35-thirty-five35-thirty101101-onehundredandone1000→one(a)thousand,10000→tenthousand,100000→onehundredthousand,1000000→onemillion,10000000→tenmillion,100000000→onehundredmillion,108→onehundredandeight,146→onehundredandforty-six,forty500→fivehundred,1001→onethousandandone,1813→onethousandeighthundredandthirteen.注意事项(1)百位与十位之间要加and;十万位和万位,亿位和千万位之间通常也要加and.(2)英语用千,百万等单位计数,大数字从右向左看,每隔三位划一逗号,倒数第一个逗号之前要用thousand,倒数第二个逗号之前要用million,倒数第三的逗号之前要用billion表示. 注意事项(3)hundred,thousand,millionhundred,thousand,作数词时,不用复数,前面可以加上one,two,…等其它数词.用作名词时复数表示"成…上…",后面必须要有of,前面可以加上some,many,several等词.如:fivehundred(五百),hundredsof(成百上千的),tenthousand(一万),thousandsof(成千上万的),millionsof(成百万的)数词:序数词.序数词:表示顺序的数词叫序数词序数词英语的序数词基本变法:(1)一般在基数词后加th,(2)-ve结尾的改为-fth,(3)-ty结尾的改为-tieth,(4)熟记特殊词.12st※first※second※thirdfourthfifthsixthseventheighthninthtenthth2120thsttwenty-firsttwentysecondtwenty-thirdndtwentieth22nd3456789rd13141516171819thirteenthfourteenthfifteenthsixteenthseventeentheighteenthnineteenth30405060708090ththirtiethfortiethfiftiethsixtiethseventietheightieth ninetiethoneundredth23rdthththththththththththth35ththirty-fifththththththththth1010011theleventh101stonehundredandfirst12thtwelfth1000th→onethousandth,1000000th→onemillionth,第703→thesevenhundredandthird,第5480→thefivethousandfour5480hundredandeightieth.注意事项(1)两位以上的序数词仅个位数部分用序数词,其余部分仍用基数词.如:thirty-sixth,thirty(2)使用序数词时一般加定冠词the. 如:I"minthethirdgrade.(3)序数词作"几分之几"讲时,有复数形式.如:1/5→onefifth;2/3→twothirds;thirds4/7→foursevenths;1/2→ahalf;sevenths1/4→aquarter;3/4→threequarters;quarters50%→fiftyhundredths(fiftyperhundredthscent).数词的用法:数词的用法:1,表示年份:2002:twentythousandandtwo;1976:nineteenseventyseventysix.2,表示日期:12月1日:Dec.1st或thefirstofDecember;2002年11月8日:Nov.8th,2002.3,表示时刻:5:15→fivefifteen或aquarterpastfive;8:30→eight8:thirty或halfpasteight;10:45→ten10:forty-five或aquartertoeleven.forty-数词的用法:数词的用法:4,表示编号:Room105→Roomone0five;BusNo.13→BusNumberThirteen;P.5→PageFive;Tel.No.7658659→TelephoneNumberseven-six-five-eight-six-five-nineseven-six-five-eight-six-five5,小数的读法:5.7→fivepointseven,0.16→zeropointonesix.数词的用法:数词的用法:6,"半"的表达:1/2→half,半小时→halfanhour,1.5小时→oneandahalfhours或onehourandahalf7,序数词前面加the时,表示顺序,加a/an时序数词前面加the时表示顺序,a/an时the表示"再一,又一".如:Thethird表示"再一,又一"lessonisratherdifficult.(第三课相当difficult.(第三课相当难)/Shallwereadthetextathirdtime?(我们把课文读第三遍,好吗?)time?(我们把课文读第三遍,好吗??(我们把课文读第三遍1