Cross-linguistically, grammatical meanings, sequences of actions and closely related subevents are often described by serial verbs. Over time, serial verbs tend to grammaticalize and when they do,...Show moreCross-linguistically, grammatical meanings, sequences of actions and closely related subevents are often described by serial verbs. Over time, serial verbs tend to grammaticalize and when they do, they do so according to certain tendencies. This thesis aims to contribute to the research on serial verbs and grammaticalization by providing an analysis of serial verbs and their degrees of grammaticalization in the Ecuadorian Siona language, a severely endangered language from the Western Tukanoan family. The results of this research include a classification of Siona serial verbs according to the parameters as proposed by Aikhenvald (2006; 2018) as well as a list of frequently serialized stems and their degrees of grammaticalization according to parameters based on the four mechanisms of grammaticalization as proposed by Heine and Kuteva (2002). Where possible, an analysis is provided of the grammatical functions of the serialized verbs.Show less