A noun:
in the possesive case:
The student's mistakes were corrected.
He has composed children's songs.
in the common case:
Will you open the garden gate, please?
with a preposition:
The parks in Riga.
I like the end of the story.
an adjective:
You are a big boy.
a pronoun:
This my coat.
a numeral:
I have two hundred books in my liabary.