文档介绍：基数词变序数词的口诀(下载后改为黑色即可)一二三,特殊记。(first,second,third)五和十二后ve,(five,twelve)f来把ve替;(fifth,twelfth)八去t,九去e,(eight,nine,--eighth,ninth)整十变y改ie,(twenty—twentieth)几十几和百到千,(seventy-five—seventy-fifth)认准个位变序数;(thirty-one—thirty-first)基数要变序数词,th在后别忘记。1 6 11 16 2 7 12 17 3 8 13 18 4 9 14 19 5 10 15 20