January
February
March
April
May
June
July
August
September
October
November
December
序数词：
first second third fourth fifth sixth seventh eighth ninth tenth eleventh twelfth thirteenth fourteenth fifteenth sixteenth seventh eighteenth nineteenth
twenty-first twenty-second twenty-third...第几十几用基数词几十加上序数词第几.
twentieth
thirtieth
fortieth
fiftieth
sixtieth
seventieth
eightieth
ninetieth
口诀：
一二三特殊记(first second third)
th要从四加起(从第四开始在基数次后面加th就行,比如 sixth seventh..)
八去t九去e(八和九的序数词分别要去掉t和e再加th)
f要把ve替(以ve结尾的词把ve变为f再加th,比如five--fifth)
ty变为tie,th加上莫犹豫(以ty结尾的,把ty变为tie再加th,比如:twenty--twentieth)
若要表示几十几,只变个位就可以.(从21开始,21-29,31-39...等,只变个位,十位不变,如:21 twenty-one 变为 twenty-first.)
