Object (grammar)
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. Types. English. 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: Note that indirect objects are frequently expressed as objects of prepositions, complicating the traditional typology; e.g. "I gave salt "to the man"." Other languages. Some Chinese verbs can have two direct objects, one being more closely bound to the verb than the other; these may be called "inner" and "outer" objects. Secundative languages lack a distinction between direct and indirect objects, but rather distinguish primary and secondary objects. Many African languages fall into this typological category. Syntactic category. 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 for the English language: Identification. 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 analytic languages such as English, since the relatively strict word order of English usually positions the object after the verb(s) in declarative sentences. However, this criterion does not apply to the very small proportion (approximately 2.9%) of the world's languages that utilize object –subject word order by default. Verb classes. 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: Ergative and object-deletion verbs can be transitive or intransitive, as indicated in the following table: 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. In sentence structure. 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.