基数词变序数词

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hundredthfirstsecondthirdfourthfifthsixthseventheighthninthtenthtwelfththirteenthfourteentheighteenthnineteenthtwentiethtwelvethirteenfourteeneighteennineteentwentyth结尾从4加起ve要用f替121314181920onetwothreefourfivesixseveneightnineten9去ety变成tieve要用f替8去t123单独记30405060708090fiftyfortythirtysixtyseventyeightyninetythirtiethfortiethfiftiethsixtiethseventietheightiethninetiethty变成tie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。firstsecondthirdfourthfiftheighthninthonetwothreefourfiveeightninetwentiethtwentyforty-fifthforty-five1stfirst2ndsecond3rdthird4thfourth5thfifth6thsixth7thseventh8theighth9thninth10thtenth11theleventh12thtwelfth13ththirteenth14thfourteenth15thfifteenth16thsixteenth17thseventeenth18theighteenth19thnineteenth20thtwentieth21sttwenty-first22ndtwenty-second23rdtwenty-third24thtwenty-fourth25thtwenty-fifth26thtwenty-sixth27thtwenty-seventh28thtwenty-eighth29thtwenty-ninth30ththirtieth31stthirty-firstLearnthesenumbersandfindouttherules:下一页上一页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(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1stfirst2ndsecond3rdthird5thfifth8theighth12thtwelfth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。9thninth下一页上一页ThefirstmonthoftheyearissecondthirdfourthfifthsixtheleventhseventheighthninthtenthtwelfthFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecemberJanuary.下一页上一页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March12thAugust8thJanuary5thJuly20thDecember1stSeptember9thApril3thNovember2ndFebruary14thMay30thJune23rdOctober21st下一页上一页Readthedates:Writing(写法）Reading（读法）January1stMarch8thAugust2ndSeptember10thJuly3rdFebruary12thOctober20thDecember25thJanuary(the)firstMarch(the)eighthAugust(the)secondSeptember(the)tenthJuly(the)thirdFebruary(the)twelfth下一页October(the)twentiethDecember(the)twenty-fifth上一页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+序数词+名词”。如：lessonfive=thefifthlesson3.表示分数时，基数词作分子，序数词作分母，当分子大于1时，分母要用复数。如：1/4onefourth;2/5twofifths上一页下一页SchoolEvents上一页下一页Homework: