 When a definite article such as "-ṭa" (singular) or "-gulo" (plural) is added, as in the tables below, nouns are also inflected for number.In most of the Bengali grammar books, cases are divided into 6 categories and an additional possessive case (possessive form is not recognised as a type of case by Bengali grammarians).But in terms of usages, cases are generally grouped into only 4 categories.