Case is the form of the noun indicated the relation of the noun to other words in the sentence or phrase.
There are two cases of nouns in English: the Common Case and the Possessive Case.
The Common Case has no special case endings. The relation of the noun in the common Case to other words is indicated by its position and by means of prepositions.
A noun in the Common Case with the prepositions to or for may express the relations which are expressed by the Ukrainian Dative Case.
The combination of a noun in the Common Case with the preposition of often expresses the relations which are expressed by Ukrainian Genitive Case.
A noun in the Common Case preceded by the prepositions by or with may express the relations which are expressed by the Ukrainian Instrumental Case.
f.E I gave the ticket to my sister. He bought a ball for his son. America was discovered by Columbus. The letter was written with a fountain-pen. Are you fond of presents?
the back of the chair the answers of the pupils