数词一、基数词A.构词法巧学妙用1到12单独记,13到19后-teen加起。20至90整十位,-ty结尾是后缀。几十几,连字符号“-”莫忘记。几百几,hundred后面and立。B.基数词的用法1.用来表示数量、各类号码等:threehundredpeople,Room202…2.表示年份、时刻、世纪,某人约几十岁时:in2013,at7:30,inthe1990s,inhistwenties3.表示顺序。单数名词+基数词,名词的第一个字母通常要大写。可以转换为the+序数词+单数名词LessonNine=theninthlesson4.hundred,thousand,million,billion前有数词时,表示确定的数目,后不用复数及of,没有数词时,则需用复数和of:前有数字后无s5.“基数词+单数名词”构成词组,相当于合成形容词,做名词的定语,用于表示时间、距离等,但词组中的名词须是单数形式.aten-minutewalk=atenminutes’walk,一个8岁的男孩an8-year-oldboy6.数词与表示时间,距离,长度的名词一起构成“数词+单位名词+形容词”,表示事物的形状,年代,长度,距离等。这条河有两米深。Theriveristwometresdeep.7.与another,more连用时,表示在已有基础上再增加一定数量,其结构为“another+基数词”或“基数词+more”他又吃了两块蛋糕。Heateanothertwocakes.=Heatetwomorecakes.二.序数词:A构词法:序数词除first,second,third以外,其余一般在基数词词尾加th构成,如thirteenth口诀:基变序,有规律,一二三,全要变th要从4加起,八减t九去e,字母f代ve,ty变成ie,若是遇到几十几,只将个位来改变B.序数词的用法1.序数词用来表示顺序、日期、楼层等thesecondpicture,March12th,onthethirdfloor..2.序数词前面要用冠词thefirstonetogettoschool三.分数的表达分数的表达:分数的分子用基数词,分母用序数词,如果分子大于1,分母用复数。threeeighths,four-fifths…特殊分数表达:ahalf(1/2),aquarter(1/4),threequarters(3/4)四.近五年江苏省13城市中考试题中有关数词的题目。A.根据句意,用所给单词的适当形式填空。1.The__________(nineteen)FootballworldCupwillbeheldinSouthAfrica(2011泰州市)2.Jackisbusypreparingforapartytocelebratehissister’s__________(twelve)birthday.Hewantstogiveherabigsurprise.(2013镇江市)3.Four__________(five)ofthestudentsinourclasshaveheardaboutthetrip.(2014常州市)4.It’sthe__________(第一)timeforNanjingtoholdtheAsiaBikeshow.Itissuretobeagreatsuccess.(2011南京)5..It’smycousin’s__________(第二十三个)birthdaynextweek.(2011苏州)6.Cindytoldmeitwasher_________(第二)timetovisitJiangxinzhouIsletduringGrapeFestival.(2011南京)7.EvenachildknowsSeptemberisthe__________(nine)monthofayear.(2012扬州)8.Myfamilyliveonthe__________(five)floorofthetallbuilding(2011盐城)9.July1stisourParty’s__________(ninety)birthdaythisyear.WeChinesepeoplearegoingtocelebrateit.(2012无锡)10.——Howoftendoyouplaybadmintonwithyourclassroom?——___________(一次)aweek.(2012连云港市)B.单项选择。1.Tony’smumlooksyoungandbeautiful.Itishardtoimaginesheisalreadyinher__________.A.fiftiesB.fiftyC.fiftiethsD.fiftieth(2015苏州)2.Thechairpersonreceivedaboutthree__________applicationstojointheBirdwatchingClub.A.hundredB.hundredsofC.hundredofD.hundreds(2012苏州市)3.About__________oftheearth__________coveredwithwater,butwehavelessandlessavailablefreshwater.(2014泰州市)A.threefourth;isB.threefourths;isC.threefourth;areD.threefourths;are4.——Sandy,whydoyoulooksoexcited?——I’llgotoLondonforthe________time.I’vebeenthereonce.A.firstB.secondC.twoD.one(2011镇江市)5.Boysandgirls,pleasseturntoPage__________andlookatthe__________picture.A.Fifth,fiveB.Five,fiveC.Fifth,fifthD.Five,fifth(2015呼和浩特)