demonstratiivisiin

Demonstratiivisiin is a Finnish grammatical form. It is the illative plural form of the adjective demonstratiivinen, used when the noun it modifies is plural and in the illative case, which indicates direction toward or into something.

In Finnish, adjectives agree with the noun in number and case. To form the illative plural for adjectives, the stem demonstratiivis- takes the suffix -iin, producing demonstratiivisiin. This form therefore appears in sentences where a plural noun is in the illative and is described by the demonstrative adjective.

The use of demonstratiivisiin is mainly attested in linguistic descriptions, grammar references, and advanced language materials illustrating Finnish inflection. In everyday conversation, speakers more often rely on demonstrative pronouns ( tämä, nuo, ne ) or other constructions rather than explicitly inflected adjectives in the illative plural. Nevertheless, demonstratiivisiin demonstrates how Finnish encodes demonstrative reference together with grammatical case for adjectives.

Etymologically, demonstratiivinen is built from the root related to demonstratio, with the typical Finnish -inen adjective ending. The illative plural form demonstratiivisiin is a regular inflectional pattern shared by many adjectives in Finnish, reflecting the language’s rich case and agreement system.