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1、,牛津小学英语Numbers数词（序数词）的表达白下区教师进修学校 王薇,数词表示事物的数目和顺序,基数词表示多少,序数词表示“第几,数字1-3,数字4-12,数字13-19,数字20-90（整十）,数字几十几,112是独立的数词,2090八个整十位数在词尾加后缀-ty 注意20,30,40,50和80的拼法.,fifth(第五)eighth(第八)ninth(第九)twelfth(第十二),基本构成方式：在基数词后加-th,拼写有变化：first（第一）second（第二）third（第三）,2090的整十数词变为序数词时,要把y变成ie,再加-th,基数词几十几变成序数词时,十位仍用基数词
2、表示,只把个位变成序数词,“序数词”运用小技巧：1、序数词通常要和定冠词“the”连用 It is the first day of the new term.2、序数词的缩略形式:,练一练,一、用所给数词的正确形式填空：1.We are in Class_（3）.2.We have_（12）months in a year,and December is the _（12）one.3.This is my_（1）car.4.I have_（3）books.,Three,twelve,twelfth,first,three,二、选择：l.September is the _ month of
3、the year.A.eighth B.ninth C.tenth D.eleventh2.There are _ days in February.A.thirty B.thirty-one C.twenty-eight D.twenty-six3.Sunday is _ day of a week.A.the last B.the seventh C.the second D.the first4.How many months are there in a year?There are _.A.eleven B.twelve C.twenty D.twelfth5.The Changjiang River is _ longest river in China.A.the first B.the second C.the third D.the fourth,B,C,D,B,A,
