dní

In a sentence

• Máme voľno na sedem dní.

  We have time off for seven days.

  Here, 'dní' is the genitive plural form of 'deň' used to indicate a quantity or duration of time.

• Sedem krásnych dní sme strávili na vidieku.

  We spent seven beautiful days in the countryside.

  In this sentence, 'dní' is the genitive plural form, again showing quantification, combined with a descriptive adjective.

• Ráno dvanástich dní je obvykle slnečné.

  The mornings of twelve days are usually sunny.

  Here, 'dní' is used in a genitive construction to indicate possession or association of the mornings in the context of specific number of days.