Instrumental case

In linguistics, the instrumental case indicates that a noun is the instrument or means by which the subject achieves or accomplishes an action. The noun may be either a physical object or an abstract concept. For example, in this Latin sentence:

libros stylo scripsi.

the inflection of the noun indicates its instrumental role -- the nominative stylus changes to stylo. English, lacking an instrumental case, might use a preposition (usually with) to express the same meaning:

I wrote the books with a pen.\n

The instrumental case appears in Old English, Sanskrit, and the Slavic languages; in Latin, it appears as the ablative of means. \n

Sources

\n* Instrumental Case in Tamil language\n* The Instrumental Case in Russian language\n* What is instrumental case?\n* Dictionary.com entry on instrumental case\n* Prepositions Governing the Instrumental Case in Russian \n