1 - the first
2 - the second
3 - the third
4 - the fourth
5 - the fifth
6 - the sixth
7 - the seventh
8 - the eighth
9 - the ninth
10 - the tenth
11 - the eleventh
12 - the twelfth
13 - the thirteenth
14 - the fourteenth
15 - the fifteenth
16 - the sixteenth
17 - the seventeenth
18 - the eighteenth
19 - the nineteenth
20 - the twentieth
21 - the twenty-first
22 - the twenty-second
23 - the twenty-third
24 - the twenty-fourth
25 - the twenty-fifth
26 - the twenty-sixth
27 - the twenty-seventh
28 - the twenty-eighth
29 - the twenty-ninth
30 -the thirtieth
31 - the thirty-first.