This thesis examines the diverse functions of -ji in Gugu- Yalanji, a language of Northeastern Australia. A general introduction to the syntax of the language is given. The verbal affix -Ji and its effect on sentences is detailed in Chapter I. Chapter II shows that the function of -ji_ in Yidiny and Dyirbal, two neighboring languages, is to intransitivize verbs to allow sentence coordination. Sentence coordination does not appear to be the primary function of Ji in Gugu-Yalanji. Other functions of the verbal affix J_ in Yidin and Dyirbal are examined in Chapter III. The affix -_ appears to be sensitive to the features of transitivity and marks transitive verbs as intransitive, shown in Chapter IV. Chapter V develops a new hypothesis regarding the use of -j in Gugu-Yalanji. There, after considering other uses of J as a nonverbal affix, it is concluded that the suffix is actually a formal mark of stativity.