从1~31的基数词和序数词各写一遍

基数词+序数词:one[基数词].first〔序数词〕 two.second three.third four.fourth five.fifth six.sixth seven.seventh eight.eighth nine.ninth ten.tenth eleven.eleventh twelve.twelfth thirteen.thirteenth fourteen.fourteenth fifteen.fifteenth sixteen.sixteenth seventeen.seventeenth eighteen.eighteenth nineteen.nineteenth twenty.twentieth twenty-one.twenty-first twenty-two.twenty-second twenty-three.twenty-third twenty-four.twenty-fourth twenty-five.twenty-fifth twenty-six twenty-sixth twenty-seven.twenty-seventh twenty-eight.twenty-eighth twenty-nine.twenty-ninth thirty.thirtieth thirty-one thirty-first
基数词变序数词的规律是一般直接+th。 ve结尾的变f再加th

1 one fist
2 two second
3 three third
4 four fourth
5 five fifth
6 six sixth
7 seven seventh
8 eight eighth
9 nine ninth
10 ten tenth
11 eleven eleventh
12 twelve twelfth
13 thirteen thirteenth
14 fourteen fourteenth
15 fifteen fifteenth
16 sixteen sixteenth
17 seventeen seventeent