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In general linguistics, a labile verb (or ergative verb) is a verb that undergoes causative alternation; that is, it can be used both transitively and intransitively, with the requirement that the direct object of its transitive use corresponds to the subject of its intransitive use, [1] as in "I ring the bell" and "The bell rings."
The ergative-absolutive alignment is in contrast to nominative–accusative alignment, which is observed in English and most other Indo-European languages, where the single argument of an intransitive verb ("She" in the sentence "She walks") behaves grammatically like the agent of a transitive verb ("She" in the sentence "She finds it") but ...
Transitive alignment: certain Iranian languages, such as Rushani, distinguish only transitivity (in the past tense), using a transitive case for both A and O, and an intransitive case for S. That is sometimes called a double-oblique system, as the transitive case is equivalent to the accusative in the non-past tense.
Often there is a semantic difference between the intransitive and transitive forms of a verb: the water is boiling versus I boiled the water; the grapes grew versus I grew the grapes. In these examples, known as ergative verbs, the role of the subject differs between intransitive and transitive verbs.
In intransitive clauses, the subject can either be represented by a set A-person marker, or a set B-person marker, depending on aspect. In perfective aspect, Chol has ergative–absolutive alignment: the subject of the intransitive verb is expressed by a suffixed person marker, thus in the same way as the object of transitive verbs.
This is in contrast with nominative-accusative and ergative-absolutive alignment languages, in which the argument of an intransitive verb patterns with either the agent argument of the transitive (in accusative languages) or with the patient argument of the transitive (in ergative languages). Thus, whereas in English, "she" in "she runs ...
The term ergative is used in grammar in three different meanings: Ergative case , the grammatical case of the subject of a transitive verb in an ergative-absolutive language Ergative–absolutive language , a language in which the subject of an intransitive verb behaves like the object of a transitive verb
That is, in the past tense (or perhaps perfective aspect), the agent and object of a transitive verb are marked with the same case ending, while the subject of an intransitive verb is not marked. In the present tense, the object of the transitive verb is marked, the other two roles are not – that is, a typical nominative–accusative alignment.