初中英语 数词

读序数词表，然后写出下列基数词的序数词。one______two________three______five________eight_______nine_______twelve_______fifteen_______eighteen________twenty__________twenty-one_______________twenty-two______________firstsecondthirdfiftheighthninthtwelfthfifteentheighteenthtwentiethtwenty-firstTwenty-second序数词:表示事物顺序的词,其前常加定冠词the。数字序数词变化规则例词1、2、3

特殊记One→first第一

two→second第二；Three→third第三4～19基数词词尾加-th特殊：five→fifth第五；eight→eighth第八；

nine→ninth第九twelve→twelfth第十二一般：four→fourth第四nineteen→nineteenth第十九20,3040,50,60,70,80,90-ty变为-tie再加thtwenty→twentieth第二十thirty→thirtieth第三十forty→fortieth第四十fifty→fiftieth第五十sixty→sixtieth第六十seventy→seventieth第七十eighty→eightieth第八十ninety→ninetieth第九十其余两位数将相应基数词的个位改为基数词twenty-one→twenty-first第二十一；thirty-nine→thirty-ninth第三十九；forty-six→forty-sixth第四十六【记忆口诀】基变序，有规律，多数词尾加-th。一、二、三特殊记，词尾字母t,d,d。八去t,，九去e,字母f把ve替，然后再加-th。遇到几十几，只变个位就可以。序数词表顺序，一般须加定冠词。

序数词的用法：1.序数词要加定冠词the。但当序数词前有物主代词（his,her…）、指示代词（this,that…）等修饰时，则不必再用the。如：

onthethirdfloor在三楼

onhistwelfthbirthday在他十二岁生日这天2.序数词常用缩写形式，即“阿拉伯数字+个位序数词的后两个字母”。如：one→1st;second→2nd;

third→3rd;twelfth→12th;twenty-sixth→26th3.序数词可表示日期“几月几日”中的“几日”。如:August17th8月17日October1st10月1日询问及回答生日

用句型Whenis/aresb’sbirthday(s)?来询问他人的生日。回答时用sb’sbirthday(s)is/are(on/in)…或用句型：It’s(on/in)…例如：—Whenisyourbirthday?你的生日是什么时候？—Mybirthdayis/It’sAugusttenth.我的生日是八月十日。—WhenisJane’sbirthday?简的生日是什么时候?—Herbirthdayis/It’sonJanuarytwelfth.

她的生日是一月十二日。—Whenaretheirbirthdays?

他们的生日是什么时候？—TheirbirthdaysareMay2ndandJune5th.

他们的生日是五月二日和六月五日。—Whenareyourparents’birthdays?

你父母的生日是什么时候？—They’reonFebruarytwenty-ninth.

他们的生日是在二月二十九日。用所给词的适当形式填空1.Sundayisthe_____(one)dayofaweek.2.Mayisthe_____(five)monthofayear.3.June8thishis_________(twenty)birthday.4.Bobisthe________(two)boytocomehere.5.Decemberisthe______（twelve）monthofayear.6.Nowitis__________(21)century.firstfifthtwentiethsecondtwelfthtwenty-firstIII.选择填空1.Januaryisthe___monthinayear.A.oneB.firstC.1th2.Ithink_____lessonisthemostdifficultinthisbook.A.fourB.fourthC.thefourth3.Thereare______monthsinayear.A.sevenB.twelveC.twelfthBCB4.____isyourbirthday?It’sOctober____.A.when,sixB.What,sixthC.When,sixth5.____comesbeforeMay.A.MarchB.JulyC.JuneCA

（）1.HowmanydaysarethereinMay?

.A.Twenty-eightB.Twenty-nineC.ThirtyD.Thirty-one（）2.

istheeighthmonthofayear.A.MayB.AprilC.AugustD.July（）3.Whenis_____

birthday?A.TomB.MikeC.Leilas’D.Leila’s（）4.Howmuchisthewhiteshirt?______A.NineyuansB.NineC.NinedollarsD.NinedollarDCDC（）5.Ourschoolhas___artfestivaleachyear.A.aB.anC.theD./（）6.--IsyourbirthdayNovember24th?---_________.A.Yes,itisB.Yes,it’sC.Yes,youareD.Yes,theyare.（）7.Theyellowshorts

15yuan.A.isonsaleB.areonsaleC.are