第一到第十:First,Second,Third,Fourth,Fifth,Sixth,Seventh,Eighth,Ninth,Tenth;第十一到第二十:Eleventh,Twelfth,Thirteenth,Fourteenth,Fifteenth,Sixteenth,Seventeenth,Eighteenth,Nineteenth,Twenty;第二十一到第二十九:Twenty-first/second/third/fourth/fifth/sixth/seventh/eighth/ninth.第三十--第九十:Thirty,Forty,Fifty,Sixty,Seventy,Eighty,Ninety;后面都和第二十后面一样。如五十五:Fifty-fifth 第一百:The first hundred