PEP五下英语第五单元知识点：基数次变序数词ppt课件.ppt
,January,February,March,April,May,June,July,August,September,October,November,December,The first month of the year is,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,1st first 2nd second 3rd third 4th fourth 5th fifth 6th sixth 7th seventh 8th eighth 9th ninth 10th tenth,11th eleventh 12th twelfth 13th thirteenth 14th fourteenth 15th fifteenth 16th sixteenth 17th seventeenth 18th eighteenth 19th nineteenth 20th twentieth,21st twenty-first 22nd twenty-second 23rd twenty-third 24th twenty-fourth 25th twenty-fifth 26th twenty-sixth 27th twenty-seventh 28th twenty-eighth 29th twenty-ninth 30th thirtieth 31st thirty-first,Learn these numbers and find out the rules:,上一页,Lets read!,one,first,two,second,three,third,four,fourth,five,fifth,six,sixth,seven,seventh,eight,eighth,nine,ninth,ten,tenth,eleven,eleventh,twelve,twelfth,thirteen,thirteenth,fourteen,fourteenth,fifteen,fifteenth,sixteen,sixteenth,seventeen,seventeenth,eighteen,eigthteenth,twenty-one,twenty-first,thirty-two,thirty-second,forty-three,forty-third,fifty-four,fifty-fourth,sixty-five,sixty-fifth,seventy-six,seventy-sixth,eighty-seven,eighty-seventh,ninety-eight,ninety-eighth,twenty,twentieth,one,first,second,two,three,third,four,fourth,five,fifth,eight,eighth,nine,ninth,twenty,twentieth,基数词变序数词口诀,基变序有规律， 一、二、三，特殊记；八去t, 九去e; 字母f 代ve ;整十数ty 变成 tie, th加在后面别忘记；若要遇到几十几，十位基，个位序。序数词前the来放，千万牢记不要忘！,1st,first,2nd,second,3rd,third,5th,fifth,8th,eighth,12th,twelfth,9th,ninth,下一页,上一页,twenty-one,twenty-first,twenty-two,twenty-second,twenty-three,twenty-third,thirty-one,thirty-first,fifty-two,fifty-second,ninety-three,ninety-third,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-second 256- two hundred and fifty-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: the first lesson = Lesson One the sixth grade = Grade Six,下一页,上一页,你能说出下列日期的英文表达并写下来？ 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,March 12th,August 8th,January 5th,July 20th,December 1st,September 9th,April 3rd,November 2nd,February 14th,May 30th,June 23rd,October 21st,下一页,上一页,Read the dates:,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,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：The second boy likes playing baseball.,序数词的用法：,1. 序数词前一般要加定冠词the。 如：The first boy is my brother.,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： lesson five = the fifth lesson,3. 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：1/4 one fourth; 2/5 two fifths,上一页,下一页,
