THE NOUN - PERSON
A person or thing that is addressed is said to be the Vocative Case or Nominative of Address.
Function of a Noun
A noun can have one of the following five uses or functions
- The subject of a verb:
e.g. David sings well
- The object of a transitive verb:
e.g. He bought a pen
- The complement of an incomplete verb:
e.g. My brother is a doctor
- The object of a preposition.
e.g. He went by this door
- In opposition to the noun that goes before it.
e.g. David, my cousin, is a great scholar