starych

In a sentence

• Widziałem starych znajomych na ulicy.

  I saw old friends on the street.

  The word 'starych' here is a plural masculine form in the accusative case, describing 'old friends'.

• Naprawiam starych samochodów w warsztacie.

  I repair old cars in the workshop.

  The word 'starych' is a plural masculine form in the genitive case, referring to 'old cars'.

• Znalazłem dokumenty wśród starych papierów.

  I found documents among old papers.

  The word 'starych' functions as a plural masculine adjective in the genitive case, modifying 'papers'.