In linguistics, an object is any of several types of arguments. In subject-prominent, nominative-accusative languages such as English, a transitive verb typically distinguishes between its subject and any of its objects, which can include but are not limited to direct objects, indirect objects, and arguments of adpositions (prepositions or postpositions); the latter are more accurately termed oblique arguments, thus including other arguments not covered by core grammatical roles, such as those governed by case morphology (as in languages such as Latin) or relational nouns (as is typical for members of the Mesoamerican Linguistic Area). In ergative-absolutive languages, for example most Australian Aboriginal languages, the term "subject" is ambiguous, and thus the term "agent" is often used instead to contrast with "object", such that basic word order is often spoken of in terms such as Agent-Object-Verb (AOV) instead of Subject-Object-Verb (SOV).Topic-prominent languages, such as Mandarin, focus their grammars less on the subject-object or agent-object dichotomies but rather on the pragmatic dichotomy of topic and comment.
In English traditional grammar types, three types of object are acknowledged: direct objects, indirect objects, and objects of prepositions. These object types are illustrated in the following table:
|Direct object||She sees the dog|
|Indirect object||I gave the man salt|
|Object of preposition||You fish for salmon|
Note that indirect objects are frequently expressed as objects of prepositions, complicating the traditional typology; e.g. "I gave salt to the man."
While the typical object is a pronoun, noun, or noun phrase, objects can also appear as other syntactic categories, as illustrated in the following table:
|Noun (phrase) or pronoun||The girl ate fruit.|
|that-clause||We remembered that we had to bring something.|
|Bare clause||We remembered we had to bring something.|
|for-clause||We were waiting for him to explain.|
|Interrogative clause||They asked what had happened.|
|Free relative clause||I heard what you heard.|
|Gerund (phrase or clause)||He stopped asking questions.|
|to-infinitive||Sam attempted to leave.|
|Cataphoric it||I believe it that she said that.|
A number of criteria can be employed for identifying objects, e.g:
Languages vary significantly with respect to these criteria. The first criterion identifies objects reliably most of the time in English, e.g.
The second criterion is also a reliable criterion for isolating languages such as English, since the relatively strict word order of English usually positions the object after the verb(s) in declarative sentences. The third criterion is less applicable to English, though, since English lacks morphological case, exceptions being the personal pronouns (I/me, we/us, he/him, she/her, they/them). For languages that have case and relatively freer word order, morphological case is the most readily available criterion for identifying objects. In Latin and related languages, direct objects are usually marked with the accusative case, and indirect objects with the dative case. However, object marking may also follow non-syntactic rules, such as animacy. In Spanish, for example, human objects have to be marked by the preposition a (as an example of differential object marking).
Verbs can be classified according to the number and/or type of objects that they do or do not take. The following table provides an overview of some of the various verb classes:
|Transitive verbs||Number of objects||Examples|
|Monotransitive||One object||I fed the dog.|
|Ditransitive||Two objects||You lent me a lawnmower.|
|Tritransitive||Three objects||I'll trade you this bicycle for your binoculars.|
|Intransitive verbs||Semantic role of subject||Examples|
|Unaccusative||Patient||The man stumbled twice, The roof collapsed.|
|Unergative||Agent||He works in the morning, They lie often.|
|Ergative||The submarine sank the freighter.|
|Object deletion||We have already eaten dinner.|
|Ergative||The freighter sank.|
|Object deletion||We have already eaten.|
The distinction drawn here between ergative and object-deletion verbs is based on the role of the subject. The object of a transitive ergative verb is the subject of the corresponding intransitive ergative verb. With object-deletion verbs, in contrast, the subject is consistent regardless of whether an object is or is not present.
Objects are distinguished from subjects in the syntactic trees that represent sentence structure. The subject appears (as high or) higher in the syntactic structure than the object. The following trees of a dependency grammar illustrate the hierarchical positions of subjects and objects:
The subject is in blue, and the object in orange. The subject is consistently a dependent of the finite verb, whereas the object is a dependent of the lowest non-finite verb if such a verb is present.