Certain grammatical elements help hearers know how propositions are conceptually related: Does a given proposition advance the foregrounded event line, or not? Initiate versus continue an event chain? Indicate that one proposition belongs to a different "mental space" from the previous one? Provide background information? Studies in this volume show that African languages sometimes support, but often refute the idea that perfective aspect or past tense marks the narrative event line. Rather, languages may employ clause level constructions, conjunctions or connectives, tonal melodies on verbs or subjects, specialized auxiliaries, special verb forms and even dependent clause and imperfective aspect forms. Often, correlation of such grammatical elements with the event line is a subcase of a more general function. Analyses in this volume contribute to developing a typology of the expression of discourse functions, a field of research which has so far been minimally addressed from a typological perspective.