Cantonese nasal-stop alternation

In Cantonese phonology, a close relationship exists between the nasal codas (-m, -n, ) and the stop codas (-p, -t, -k). These two types of codas can also be classified into three homorganic pairs: the bilabial m/p, the dental n/t, and the velar ŋ/k. Some of the correspondences trace back to Old Chinese, or developed as a historical coincidence of sound change. However, many pairs exist that are solely Cantonese and not found in Classical Chinese.