wiosny

In a sentence

• Czekam z niecierpliwością na wiosny powroty ptaków.

  I eagerly await the spring returns of birds.

  Here, 'wiosny' is used to refer to the genitive singular case of the noun 'wiosna,' used in expressions denoting longing for something related to spring.

• Zapach kwiatów wiosny jest niezapomniany.

  The scent of spring flowers is unforgettable.

  In this sentence, 'wiosny' is also in the genitive case, describing 'flowers of spring.'

• Podczas wiosny wszystko zdaje się żyć na nowo.

  During spring, everything seems to come back to life.

  Here, 'wiosny' is the locative singular case of 'wiosna,' used after the preposition 'podczas' (during).