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基数词(数目/数量的多少)序数词(顺序和等级)缩写星期单词缩写在上午11st星期一MondayMona.m.22nd星期二TuesdayMon.inthemorning33rd星期三WednesdayTues.44th星期四ThursdayWed.在下午55th星期五FridayThur.p.m.66th星期六SaturdayFri.intheafternoon77th星期日SundaySat.intheevening88th周末weekendSun.atnight99th月month1010th一月JanuaryJAN.Jan.1111th二月FebruaryMAR.Mar.1212th三月MarchAPR.Apr.1313th四月AprilAPR.Apr.1414th五月MayMAY.May.1515th六月JuneJUN.Jun.1616th七月JulyJUL.Jul.1717th八月AugustAUG.Aug.1818th九月SeptemberSEP.Sept.1919th十月OctoberOCT.Oct.2020th十一月NovemberNOV.Nov.3030th十二月DecemberDEC.Dec.4040th季节season一次once5050th春spring两次twice6060th夏summer三次thrice7070th秋autumn一倍timesdouble8080th冬winter二倍doubleness9090th第一百零一hundredandfirstthrice100100th200twohundred第二百twohundredth2121st第二百twohundredth1000thousand36第一千thousandth第一千thousandtheightythirty-sixthirty-sixthhundredhundredthtwenty-onetwenty-firstseventieth1-12单独记忆13-19尾加+teen20-90(整数)尾+ty依此类推13-19尾+th以ty结尾的数词,改y为i+eth基数-序数fortyforiethfiftyfiftietheightiethninetyninetiethsixtysixtiethseventynineteennineteenthtwentytwentieththirtythritiethsixteensixteenthseventeenseventeentheighteeneighteenththirteenthirteenthfourteenfourteenthfifteenfifteenthtentemtheleveneleventhtwelvetwelfethsevenseventheighteighthnineninthfourfourthfivefifthsixsixth㈠基数词记忆歌诀：1至12单独记，13至19-teen结尾；整十词尾是-ty，记清何时连字符；百十之间用and。注意：十五五十别多e，十九九十别少e。二三四五八，个十首相差。说明：①十五、五十的正确写法分别是fifteen,fifty。最容易错写成fifeteen,fifety。十九、九十的正确写法分别是nineteenth,ninety。最容易错写成nineeenth,ninty。要特别注意！②“二三四五八，个十首相差”指的是“二三四五八”这几个数字做个位数和做十位数时，其英语单词开头写法是不同的。如：two—twelve—twenty，three—thirteen—thirty，four—fourteen—forty，five—fifteen—fifty㈡序数词记忆歌诀：第1、2、3、12单独记；第五第九均无e；整十y变ie，然后再加-th；整十带个是“基+序”；其余直接加-th。说明：序数词有两种写法：①用英语单词；②用“阿拉伯数字+词尾-st/-nd/-r/-th”归类表格(一)前3个字母加点onefirst1-12单独记忆twosecondthreethird