Everything is for my good friend, I can go to your house tomorrow at 11am.
I have an exam tomorrow, I need you to explain to me how proper and common nouns are used.
 Well, proper nouns ('proper nouns') name a certain person, animal or thing. Example:  Mary, Peter, Malaga.
No article is usually preceded unless we want to specify that something or someone has the same characteristics or qualities as the proper name (this proper name would become a common one).
Ok, now I understand, it is not so difficult.
To form the plural, they follow the rules that we have specified except those that end in -y, which always form the plural by simply adding an -s.
Then we could use words like:Susan - SusansToyota - ToyotasJones - JonesesMary-MarysMay - Mays
Common nouns name all people, animals or things of the same class or species and in turn are divided into concrete and abstract.Example: chair, money, woman, poverty, friendship