The Instrumental Case in Polish

The Instrumental case (Narzędnik) is the fifth grammatical case in Polish. It answers the questions 'kim?' (with whom / as who) and 'czym?' (with what / using what). One of its primary roles is to identify the instrument or means by which an action is performed. For example, 'pisać długopisem' means to write with a pen. It is also used to state someone's profession, role, or nationality after the linking verb 'być' (to be). For instance, in 'Jestem nauczycielem' (I am a teacher), the noun is in the instrumental case.

Additionally, the instrumental case is required after specific prepositions, especially those indicating location or company. These include 'z' (with), 'pod' (under), 'nad' (above / by), 'przed' (before / in front of), 'za' (behind), and 'między' (between). For example, 'idę z bratem' (I go with my brother). The endings for nouns in this case are relatively regular: masculine and neuter singular nouns typically end in '-em', while feminine singular nouns end in '-ą'. Adjectives take '-ym/-im' for masculine/neuter and '-ą' for feminine. It is one of the easiest cases to master due to ending consistency.