Quechua language

Quechua was the official language of Tawantinsuyu (the Incan Empire) and is spoken today by approximately 13 million people in Bolivia, Peru, Ecuador, Northern Chile, Argentina, and Southern Colombia.

Quechua is a perfectly regular language, but a large number of infixes and suffixes change both the overall significance of words and their subtle shades of meaning, allowing great expressiveness. It includes grammatical features such as bipersonal conjugation and conjugation dependent on mental state and veracity of knowledge, spatial and temporal relationships, and many cultural factors.