英语序数词口诀：基变序，有规律，词尾加上“duth”。
一、二、三（first、second、third）特殊记；从4开始上th；5变ve改f（fifth），8去t（eighth），9减daoe（ninth）。几十尾巴ty变tie，后面跟上th（twentieth）；几十几，头不变，尾巴变，中间记得加个杠（twenty-fourth）；遇到特殊要除外（twenty-first）。
1到100的序数词英语口诀如下：
First, second, third, fourth,
Fifth, sixth, seventh, eighth,
Ninth, tenth, eleventh, twelfth,
Thirteenth, fourteenth, fifteenth, sixteenth,
Seventeenth, eighteenth, nineteenth, twentieth,
Twenty-first, twenty-second, twenty-third, twenty-fourth,
Twenty-fifth, twenty-sixth, twenty-seventh, twenty-eighth,
Twenty-ninth, thirtieth, thirty-first, thirty-second,
Thirty-third, thirty-fourth, thirty-fifth, thirty-sixth,
Thirty-seventh, thirty-eighth, thirty-ninth, fortieth,
Forty-first, forty-second, forty-third, forty-fourth,
Forty-fifth, forty-sixth, forty-seventh, forty-eighth,
Forty-ninth, fiftieth, fifty-first, fifty-second,
Fifty-third, fifty-fourth, fifty-fifth, fifty-sixth,
Fifty-seventh, fifty-eighth, fifty-ninth, sixtieth,
Sixty-first, sixty-second, sixty-third, sixty-fourth,
Sixty-fifth, sixty-sixth, sixty-seventh, sixty-eighth,
Sixty-ninth, seventieth, seventy-first, seventy-second,
Seventy-third, seventy-fourth, seventy-fifth, seventy-sixth,
Seventy-seventh, seventy-eighth, seventy-ninth, eightieth,
Eighty-first, eighty-second, eighty-third, eighty-fourth,
Eighty-fifth, eighty-sixth, eighty-seventh, eighty-eighth,
Eighty-ninth, ninetieth, ninety-first, ninety-second,
Ninety-third, ninety-fourth, ninety-fifth, ninety-sixth,
Ninety-seventh, ninety-eighth, ninety-ninth, one hundredth.
这个口诀可以帮助大家记忆1到100的序数词，希望对大家有帮助。
