基数词变序数词PPT课件

-,1,Whenisyourbirthday?,-,2,基数词变序数词口诀,一、二、三，单独记，结尾是t,d,d；th从四起；八去t，九去e；ve要用f替；整十基数变序数，先把ty变成tie；要是遇到几十几，前用基数后用序。,基数词序数词基数词序数词1one第一first2two第二second3three第三third4four第四fourth5five第五fifth6six第六sixth7seven第七seventh8eight第八eighth9nine第九ninth10ten第十tenth11eleven第十一eleventh12twelve第十二twelfth20twenty第二十twentie21twenty-one第二十一twenty-first22twenty-two第二十二twenty-second23twenty-three第二十三twenty-third99ninety-nine第九十九ninety-ninth100hundred第一百hundredth,-,3,序数词,firstsecondthirdfourthfifthsixthseventheighthninthtenth,twelfth,thirteenth,fourteenth,eighteenth,nineteenth,twentieth,twelve,thirteen,fourteen,eighteen,nineteen,twenty,th结尾从4加起,ve要用f替,121314181920,onetwothreefourfivesixseveneightnineten,9去e,ty变成tie,ve要用f替,8去t,123单独记,-,4,30405060708090,fifty,forty,thirty,sixty,seventy,eighty,ninety,thirtieth,fortieth,fiftieth,sixtieth,seventieth,eightieth,ninetieth,ty变成tie,整十的,-,5,基变序有规律,一二三单独记，th结尾从4加起，八去t，九去e，ve要用f替，ty要用tie，若是遇到几十几，只变个位就可以，序数前要加the，我们一定要记牢。,firstsecondthirdfourthfiftheighthninth,onetwothreefourfiveeightnine,twentieth,twenty,forty-fifth,forty-five,-,6,1stfirst2ndsecond3rdthird4thfourth5thfifth6thsixth7thseventh8theighth9thninth10thtenth,11theleventh12thtwelfth13ththirteenth14thfourteenth15thfifteenth16thsixteenth17thseventeenth18theighteenth19thnineteenth20thtwentieth,21sttwenty-first22ndtwenty-second23rdtwenty-third24thtwenty-fourth25thtwenty-fifth26thtwenty-sixth27thtwenty-seventh28thtwenty-eighth29thtwenty-ninth30ththirtieth31stthirty-first,Learnthesenumbersandfindouttherules:,下一页,上一页,-,7,基数词变序数词表示顺序的数词叫序数词。基数词变序数词的规则是：（1）大部分数词在词尾加th：如:fourth（第四）thirteenth（第十三）hundredth（第一百）（2）表示整十的基数词，变y为ie，再加eth;如：twentieth第二十eightieth第八十（3）特殊的序数词有:第一first,第二second，第三third，第五fifth,第八eighth,第九ninth，第十二twelfth,下一页,上一页,-,8,(4)要把一个“几十几”，“几百几”的基数词变成序数词，只需把个位数变成序数词。如:32-thirty-second256-twohundredandfifty-sixth(5)在表示编号的东西时，可以用基数词表示，也可用序数词表示如:thefirstlesson=LessonOnethesixthgrade=GradeSix,下一页,上一页,-,9,1st,first,2nd,second,3rd,third,5th,fifth,8th,eighth,12th,twelfth,基变序有规律，结尾字母是th;一、二、三，特殊记，结尾字母是t,d,d；八去t,九去e;f要把ve替。ty将y变成i,th前面有个e；几十几，也好记，只变个位就可以。,9th,ninth,下一页,上一页,-,10,Thefirstmonthoftheyearis,second,third,fourth,fifth,sixth,eleventh,seventh,eighth,ninth,tenth,twelfth,February,March,April,May,June,July,August,September,October,November,December,January.,下一页,上一页,-,11,写出下列日期的英文表达法1.3月12日2.8月8日3.1月5日4.7月20日5.12月1日6.9月9日7.4月3日8.11月2日9.2月14日10.5月30日11.6月23日12.10月21日,March12th,August8th,January5th,July20th,December1st,September9th,April3th,November2nd,February14th,May30th,June23rd,October21st,下一页,上一页,-,12,Readthedates:,January(the)first,March(the)eighth,August(the)second,September(the)tenth,July(the)third,February(the)twelfth,下一页,October(the)twentieth,December(the)twenty-fifth,上一页,-,13,4.序数词常用作名词的定语，但当名词前面已有物主代词等限定词时，则不能再用the。如：Thesecondboylikesplayingbaseball.,序数词的用法：,1.序数词前一般要加定冠词the。如：Thefirstboyismybrother.,2.表示编号时，常把基数词放在名词后面来表示顺序，相当于“the+