дітьми

In a sentence

• Вона грається з дітьми в парку.

  She is playing with children in the park.

  "Дітьми" is used here as an instrumental case plural of "діти" (children), indicating with whom the action is performed.

• Цей урок я провів з дітьми з великим задоволенням.

  I conducted this lesson with children with great pleasure.

  "Дітьми" again is the instrumental plural form of "діти," showing the participants with whom the action of conducting the lesson took place.

• У парку було багато мам з дітьми.

  There were many mothers with children in the park.

  Here, "дітьми" remains in the instrumental plural form, describing the association or accompaniment of the mothers with their children.