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Concept
Nominative–accusative alignment
Summary
In linguistic typology, nominative–accusative alignment is a type of morphosyntactic alignment in which subjects of intransitive verbs are treated like subjects of transitive verbs, and are distinguished from objects of transitive verbs in basic clause constructions. Nominative–accusative alignment can be coded by case-marking, verb agreement and/or word order. It has a wide global distribution and is the most common alignment system among the world's languages (including English). Languages with nominative–accusative alignment are commonly called nominative–accusative languages.
Morphosyntactic alignment
A transitive verb is associated with two noun phrases (or arguments): a subject and a direct object. An intransitive verb is associated with only one argument, a subject. The different kinds of arguments are usually represented as S, A, and O. S is the sole argument of an intransitive verb, A is the subject (or most agent-like) argument of a transitive verb, and O is the direct object (or most patient-like) argument of a transitive verb. English has nominative–accusative alignment in its case marking of personal pronouns: the single argument (S) of an intransitive verb ("I" in the sentence "I walked.") behaves grammatically like the agent (A) of a transitive verb ("I" in the sentence "I saw them.") but differently from the object (O) of a transitive verb ("me" in the sentence “they saw me.").
This is in contrast with ergative–absolutive alignment, where S is coded in the same way as O, while A receives distinct marking, or tripartite alignment, where A, S and O all are coded in a different manner.
It is common for languages (such as Georgian and Hindustani) to have overlapping alignment systems, which exhibit both nominative–accusative and ergative–absolutive coding, a phenomenon called split ergativity. In fact, there are relatively few languages that exhibit only ergative–absolutive alignment (called pure ergativity) and tend to be isolated in certain regions of the world, such as the Caucasus, parts of North America and Mesoamerica, the Tibetan Plateau, and Australia.
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