kosmonautą

In a sentence

• Mój brat marzy, żeby zostać kosmonautą.

  My brother dreams of becoming an astronaut.

  Here, 'kosmonautą' is used in an instrumental case to describe a profession the subject aspires to achieve.

• Nie każdy może zostać kosmonautą, to wymaga wyjątkowych umiejętności.

  Not everyone can become an astronaut; it requires exceptional skills.

  In this sentence, 'kosmonautą' is again in the instrumental case, used to demonstrate a potential state or profession someone might attain.

• Rozmawiałem z kosmonautą o jego doświadczeniach w kosmosie.

  I spoke with an astronaut about his experiences in space.

  Here, 'kosmonautą' illustrates its usage as an instrumental case when referring to engaging or interacting with someone in a specific role or profession.