dni

In a sentence

• V teh dneh je zelo hladno.

  These days it is very cold.

  Here, 'dneh' is in the locative case, indicating 'in these days'.

• Imel sem nekaj lepih dni na dopustu.

  I had some lovely days on vacation.

  Here, 'dni' is in the genitive plural, indicating the 'of days' context.

• Za nekaj dni grem na potovanje.

  I am going on a trip for a few days.

  Here, 'dni' is in the accusative plural, indicating the 'for a period of days' context.