The document discusses morphologically conditioned sound changes in Wanka-Quechua. It provides evidence of genuine grammatically conditioned sound changes. It presents cases of changes affecting certain grammatical categories, such as the elision of /k/ following certain suffixes. Some changes began affecting suffixes and later generalized to the entire system. The data comes from the Wanka variety of Quechua spoken in Peru and shows that sound changes can be grammatically conditioned from the beginning, contradicting a strong version of the Neogrammarian view of sound change.