etapu

In a sentence

• Na tym etapie projektu, musimy skupić się na szczegółach.

  At this stage of the project, we need to focus on the details.

  Here, 'etapu' is in the genitive case as it describes the 'stage' (etap) related to the project.

• Podczas etapu końcowego, proces produkcji jest intensywny.

  During the final stage, the production process is intense.

  'Etapu' is used in the genitive case, indicating possession by the 'final stage' described.

• Zaplanowano rozwój w kilku etapach, każdy mający swoją specyfikację.

  Development is planned in several stages, each having its own specifications.

  Here, 'etapu' isn't directly present, but 'etap' is referenced in plural nominative as part of the planning stages.