What is Grammatical forms such as the nominative objective and possessive?

You're asking about cases, which are grammatical forms that indicate the function of a noun or pronoun within a sentence. The nominative, objective, and possessive are just three of the many cases that exist across different languages.

Here's a breakdown:

Nominative Case:

* Function: Indicates the subject of a verb.

* Example: "She went to the store." ("She" is the subject of the verb "went")

Objective Case:

* Function: Indicates the object of a verb or preposition.

* Examples:

* "The dog chased him." ("Him" is the object of the verb "chased")

* "I went to the park with them." ("Them" is the object of the preposition "with")

Possessive Case:

* Function: Indicates possession or ownership.

* Examples:

* "John's car is red."

* "This is my book."

* "The children's toys were scattered everywhere."

Important Notes:

* English has limited case: English has only a small number of cases compared to other languages. The main distinction is between the nominative and objective cases, which we often signal through word order and prepositions.

* Case marking in other languages: Many languages use case endings attached to nouns and pronouns to indicate their function. For example, in German, the word "der" can be nominative, accusative, or dative depending on the ending added.

Other cases in languages:

Beyond nominative, objective, and possessive, other cases exist like:

* Dative: Indicates the indirect object of a verb.

* Instrumental: Indicates the tool or instrument used in an action.

* Vocative: Used to address someone directly.

Let me know if you'd like more information about any specific case or a language's case system!