In many languages, the objects of transitive verbs are either marked by grammatical case or agreement on the verb, or they remain unmarked: this is differential object marking. This book is a cross-linguistic study of how differential object marking is affected by information structure, the structuring of the utterance in accordance with the informational value of its elements and contextual factors. Marked objects tend to be associated with old information or information that the sentence is about, while unmarked objects tend to express new information. The book also sheds light on grammatical patterning in languages with differential object marking: in some languages marked and unmarked objects have identical grammatical properties, whereas in other languages marked objects are more active in syntax. Finally, it provides a theory of the historical changes that lead to the emergence of various patterns of differential object marking.
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