The Accusative case reference article from the English Wikipedia on 24-Apr-2004
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Accusative case

Cases
Abessive case
Ablative case
Absolutive case
Accusative case
Adessive case
Allative case
Comitative case
Dative case
Dedative case
Elative case
Ergative case
Essive case
Genitive case
Illative case
Inessive case
Instrumental case
Locative case
Nominative case
Oblique case
Partitive case
Possessive case
Postpositional case
Prepositional case
Prolative case
Terminative case
Translative case
Vocative case
Declension
List of cases

The accusative case of a noun is the case used to mark the direct object of a verb. The same case is used in many languages for the objects of (some or all) prepositions.

The accusative case exists (or existed once) in all the Indo-European languages (including Latin, Sanskrit, Greek, German, Russian), in the Finno-Ugric languages, and in Semitic languages (including Arabic and Hebrew).

English, which lacks declension in its nouns, has an explicitly marked accusative case in a few pronouns. "Whom" is the accusative case of "who"; "him" is the accusative case of "he"; and "her" is the accusative case of "she". (These words also serve as the dative case pronouns in English and could arguably be classified in the oblique case instead; see Declension in English.)

Example: John threw the ball.

See Morphosyntactic alignment.