1、数词1.基数词与序数词阿拉伯基数词序数词缩写阿拉伯基数词序数词缩写1onefirst1st11eleveneleventh11th2twosecond2nd12twelvetwelfth12th3threethird3rd13thirteenthirteenth13th4fourfourth4th14fourteenfourteenth14th5fivefifth5th15fifteenfifteenth15th6sixsixth6th16sixteensixteenth16th7sevenseventh7th17seventeenseventeenth17th8eighteighth8th1
2、8eighteeneighteenth18th9nineninth9th19nineteennineteenth19th10tententh10th22twenty-twotwenty-second/20twentytwentieth20th33thirty-threethirty-third/30thirtythirtieth30th44forty-fourforty-fourth/40fortyfortieth40th55fifty-fivefifty-fifth/50fiftyfiftieth50th66sixty-sixsixty-sixth/60sixtysixtieth60th77
3、seventy-sevenseventy-seventh/70seventyseventieth70th88eighty-eighteighty-eighth/80eightyeightieth80th99ninety-nineninety-ninth/90ninetyninetieth90th/基数词1.读数2.hundred、thousand等使用规则数词考点口诀：s、of同生共死；遇到数字都得死hundred百2 hundred books、hundreds of booksthousand千2 thousand books、thousands of booksmillion百万2 mi
4、llion books、millions of booksbillion十亿2 billion books、billions of books序数词1.物主代词与the序数词前有定冠词the,除非遇物主（Lucys ，their，my等）I gave the second boy a toy.Lucys first class/play his piano/my best friend原则：物主代词与冠词有且只有一个2.表达方式123个别记忆one two three first second third8去t,9去eeight nine eighth ninthve要用f替five twel
5、ve fifth twelfth见y变成i和etwenty thirty twentieth thirtieth若是遇上几十几，只变个位就可以twenty-one twenty-first twenty-one twenty-first3.常用：楼层、生日Mike lives on fifth floor.Its your eighteenth birthday. Lets enjoy ourselves.数词的应用1.小数、百分数的表达23.99point nine nine3.1415926.three point one four one five nine two six.1%one
6、percent2%two percent97%ninety-seven percent2.编号的表达名前为序the fifth boy名后为基Boy 5注意：编号大写3.时间的表达3:00three oclock10:30half past ten顺读法、 逆读法10:10顺读：先时后分 ten nine 逆读：先分后时 nine past ten12：58顺读：先时后分twelve fifty-eight 逆读：先分后时 two to one一刻：a quarter10:15a quarter past ten9:45特权：three quarters past nine4.表示年份、年代（1）年份用基数词表达in 2022/in 1949（2）年代用“in the+基数词的复数”表达in the 1980s/1980s 在20世纪80年代 读作”“ain the twenty twenties”5.表示年龄（1）基数词 years old 表示“.岁”He is 15 years old（2）at the age of +基数词 表示“在某人多少岁的时候”He began to play the guitar at the age of 4.（3）in ones 整十基础词的复数 表示“在某人几十多岁的时候”in his thirties 在他三十多岁的时候
