基数词变序数词口诀：基变序有规律，123特殊记。th4加起，8减t来，9去e。ve要用f替，ty变成tie。若要变为几十几，只变个位就可以。（firstsecondthirdfourtheighthninthtwelfthtwentiethtwenty-first）基数词变序数词口诀：基变序有规律，123特殊记。th4加起，8减t来，9去e。ve要用f替，ty变成tie。若要变为几十几，只变个位就可以。（firstsecondthirdfourtheighthninthtwelfthtwentiethtwenty-first）基数词变序数词口诀：基变序有规律，123特殊记。th4加起，8减t来，9去e。ve要用f替，ty变成tie。若要变为几十几，只变个位就可以。（firstsecondthirdfourtheighthninthtwelfthtwentiethtwenty-first）基数词变序数词口诀：基变序有规律，123特殊记。th4加起，8减t来，9去e。ve要用f替，ty变成tie。若要变为几十几，只变个位就可以。（firstsecondthirdfourtheighthninthtwelfthtwentiethtwenty-first）基数词变序数词口诀：基变序有规律，123特殊记。th4加起，8减t来，9去e。ve要用f替，ty变成tie。若要变为几十几，只变个位就可以。（firstsecondthirdfourtheighthninthtwelfthtwentiethtwenty-first）基数词变序数词口诀：基变序有规律，123特殊记。th4加起，8减t来，9去e。ve要用f替，ty变成tie。若要变为几十几，只变个位就可以。（firstsecondthirdfourtheighthninthtwelfthtwentiethtwenty-first）基数词变序数词口诀：基变序有规律，123特殊记。th4加起，8减t来，9去e。ve要用f替，ty变成tie。若要变为几十几，只变个位就可以。（firstsecondthirdfourtheighthninthtwelfthtwentiethtwenty-first）
