译林英语5下序数词

序数词变化规则：一二三特殊记，词尾各是tdd；th四加起，八去t，九去e，y结尾改ie；ve结尾变f，five、twelve是两兄弟；若是遇到几十几，只变个位就可以。1-30基数词和对应序数词：(抄写2遍：书上一遍，练习本上一遍)1:one—first2:two—second3:three—third4:four-fourth5:five—fifth6:six—sixth7:seven—seventh8:eight—eighth9:nine—ninth10:ten—tenth11:eleven—eleventh12:twelve—twelfth13:thirteen—thirteenth14:fourteen—fourteenth15:fifteen—fifteenth16:sixteen—sixteenth17:seventeen—seventeenth18:eighteen—eighteenth19:nineteen—nineteenth20:twenty—twentieth21:twenty-one—twenty-first22:twenty-two—twenty-second23:twenty-three—twenty-third24:twenty-fuor—twenty-fourth25:twenty-five—twenty-fifth26:twenty-six—twenty-sixth27:twenty-seven—twenty-seventh28:twenty-eight—twenty-eighth29:twenty-nine—twenty-ninth30:thirty—thirtieth31.thirty-one—thirty-first