isä

In a sentence

• Isäni on töissä kaupungissa.

  My father works in the city.

  'Isäni' is a possessive form meaning 'my father', where 'isä' roots the word to mean 'father'.

• Isä rakastaa lapsiaan.

  Father loves his children.

  'Isä' is used as a subject noun delineating 'father' in a general descriptive sentence.

• Minulla on isä ja äiti.

  I have a father and a mother.

  'Isä' is used as a direct object noun, identifying the relationship of 'father'.

• Isä on perheen pää.

  Father is the head of the family.

  The word "isä" in this sentence directly refers to the father figure of the family, fulfilling the noun's role as a subject.

• Isällä on uusi auto.

  Father has a new car.

  Here, "isällä" indicates possession by the father, achieved through the use of the adessive case in Finnish.

• Kuulin isältä kiinnostavan tarinan.

  I heard an interesting story from father.

  "Isältä" in this sentence shows a relation of receiving (the source of information) from father, expressed by the use of the ablative case.