Товч агуулга:Mongolian is an ordinary DOM (Differential Object Marking) language: the accusative case does not always occur on direct objects. This book investigates the phenomenon starting from the research question of how the Mongolian pattern is influenced by factors that cross-linguistically trigger DOM, such as referentiality, animacy, and topicality. Apart from DOM, Mongolian also exhibits a specific type of Differential Subject marking (DSM), in which the subjects of embedded clauses (including adverbial clauses) occur with the accusative case. Both observations about DOM and DSM in Mongolian can be brought together in the generalization that the accusative case in Mongolian is used to distinguish between two arguments not only within a clause but also across the clause boundaries.