Whenisyourbirthday?基數(shù)詞變序數(shù)詞口訣一、二、三，單獨(dú)記，結(jié)尾是t,d,d;th從四起;八去t，九去e;ve要用f替;整十基數(shù)變序數(shù)，先把ty變成tie;要是遇到幾十幾，前用基數(shù)后用序。

基數(shù)詞序數(shù)詞基數(shù)詞序數(shù)詞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-third

99ninety-nine第九十九ninety-ninth100hundred第一百hundredth序數(shù)詞firstsecondthirdfourthfifthsixthseventheighthninthtenthtwelfththirteenthfourteentheighteenthnineteenthtwentiethtwelvethirteenfourteeneighteennineteentwentyth結(jié)尾從4加起ve要用f替121314181920onetwothreefourfivesixseveneightnineten9去ety變成tieve要用f替8去t123單獨(dú)記30405060708090fiftyfortythirtysixtyseventyeightyninetythirtiethfortiethfiftiethsixtiethseventietheightiethninetiethty變成tie整十的基變序有規(guī)律,一二三單獨(dú)記,th結(jié)尾從4加起,八去t,九去e,ve要用f替,ty要用tie,若是遇到幾十幾,只變個(gè)位就可以,序數(shù)前要加the,我們一定要記牢。

firstsecondthirdfourthfiftheighthninthonetwothreefourfiveeightninetwentiethtwentyforty-fifthforty-five1stfirst

2ndsecond

3rdthird4thfourth5th

fifth6thsixth7thseventh8theighth9th

ninth10thtenth11theleventh12th

twelfth13ththirteenth14thfourteenth15thfifteenth16thsixteenth17thseventeenth18theighteenth19thnineteenth20thtwentieth21sttwenty-first22ndtwenty-second23rdtwenty-third24thtwenty-fourth25thtwenty-fifth26thtwenty-sixth27thtwenty-seventh28thtwenty-eighth29thtwenty-ninth30ththirtieth31stthirty-firstLearnthesenumbersandfindouttherules:基數(shù)詞變序數(shù)詞

表示順序的數(shù)詞叫序數(shù)詞。

基數(shù)詞變序數(shù)詞的規(guī)則是：（1)大部分?jǐn)?shù)詞在詞尾加th：

如:fourth（第四)thirteenth（第十三)hundredth（第一百)（2)表示整十的基數(shù)詞，

變y為ie，

再加eth;

如：twentieth第二十eightieth第八十（3)特殊的序數(shù)詞有:第一first,第二second，

第三third，

第五fifth,第八eighth,第九ninth，第十二twelfth(4)要把一個(gè)"幾十幾”，"幾百幾”的基

數(shù)詞變成序數(shù)詞，只需把個(gè)位數(shù)變成序數(shù)詞。

如:32---thirty-second256---twohundredandfifty-sixth(5)在表示編號(hào)的東西時(shí)，可以用基數(shù)詞表示，

也可用序數(shù)詞表示

如:thefirstlesson=LessonOnethesixthgrade=GradeSix

1st

first

2nd

second3rdthird5thfifth8theighth12thtwelfth基變序有規(guī)律，結(jié)尾字母是th;一、二、三，特殊記，結(jié)尾字母是t,d,d;八去t,九去e;f要把ve替。ty將y變成i,th前面有個(gè)e;幾十幾，也好記，只變個(gè)位就可以。

9thninthThefirstmonthoftheyearissecondthirdfourthfifthsixtheleventhseventheighthninthtenthtwelfthFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecemberJanuary.寫出下列日期的英文表達(dá)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March12thAugust8thJanuary5thJuly20thDecember1stSeptember9thApril3thNovember2ndFebruary14thMay30thJune23rdOctober21stReadthedates:January(the)firstMarch(the)eighthAugust(the)secondSeptember(the)tenthJuly(the)thirdFebruary(the)twelfthOctober(the)twentiethDecember(the)twenty-fifth4.序數(shù)詞常用作名詞的定語(yǔ)，但當(dāng)名詞前面已有物主代詞等限定詞時(shí)，則不能再用the。

如:Thesecondboylikesplayingbaseball.序數(shù)詞的用法:1.序數(shù)詞前一般要加定冠詞the。

如:Thefirstboyismyb