1.first 2.second 3.third 4.fourth 5.fifth 6.sixth 7.seventh 8.eighth 9.nineth 10.tenth 11eleventh 12twelveth 13.thirteenth ...20twentith 21.twentith-first ...依次类推,一般都是基数词后加th,有y就变i再加,有t了直接加h.
1.first 2.second 3.third 4.fourth 5.fifth 6.sixth 7.seventh 8.eighth 9.nineth 10.tenth 11eleventh 12twelveth 13.thirteenth ...20twentith 21.twentith-first ...依次类推,一般都是基数词后加th,有y就变i再加,有t了直接加h.