Book excerpt: A typological study of the rare marked-S language type which overtly marks the single argument of intransitive verbs (S) while one of the arguments of transitive verbs (either A or P) is left zero-coded. The formal (overt versus zero-coding) as well as functional aspects (range of uses of individual case forms) of the phenomenon are treated. The book covers languages from the Afro-Asiatic and Nilo-Saharan languages of Africa and of the North America Pacific Northwest and Pacific regions.