pocztówek

In a sentence

• Kupiłem kilka pocztówek na wakacjach.

  I bought several postcards on vacation.

  Here, 'pocztówek' is used in the context of buying postcards as souvenirs or for sending to friends, and it is the genitive plural form of 'pocztówka'.

• Zbieram pocztówek z różnych krajów.

  I collect postcards from different countries.

  In this sentence, 'pocztówek' is used to denote the objects of the collection, emphasizing their variety and origins; again, it's in the genitive plural.

• Nie mam w tej chwili żadnych pocztówek do wysłania.

  I don't have any postcards to send at the moment.

  Here, 'pocztówek' is applied in the context of availability, specifying the lack of postcards to send, and it is used in the genitive plural form due to the negation.