Case

Number	Subjective	Objective	Possessive	Double Possessive	Reflexive Pronoun
Singular	I You He She It Roy	Me You Him Her It Roy	My Your His Her Its Roy’s	Mine Yours His Hers --- ---	Myself Yourself Himself Herself Itself ---
Plural	We You They	Us You Them	Our Your Their	Ours Yours Theirs	Ourselves Yourselves Themselve

Definition of case: The relation in which a noun stands to some other word or the change of form by which this relation is indicated, is called its case.

Kinds of Case: 
                1. Subjective/Nominative Case.

a)      Nominative of address or vocative case.

b)      Nominative absolute.

c)      Complementary nominative. 
2. Objective Case.

           3.  Possessive Case.

a)      Double possessive.

b)      Treble possessive.

c)      Elliptical possessive.

Details on case:

Subjective/Nominative Case: When a noun or pronoun is used as the subject of a verb then it is said subjective case.

Examples:

He did the work.

You went there.

They are going to market.

Vocative Case: When a noun is used to address a person or thing, the noun is called the Nominative of address. It is also called Vocative Case or Case of Address.

Examples:

Come here, Ram.

Come on, boys.

Roy, what are you doing?

Nominative absolute: When a noun or pronoun is followed by a participle and not by a finite verb, it is called the Nominative absolute.

Examples:

The sun having, we went home.

I will come tomorrow, weather permitting.

Dinner being over, the guest left the table.

Complementary nominative: When a noun use as a complement in a sentence, then that complement works as a nominative case. And this kind of nominative case is called Complementary Nominative.

Examples:

He is a doctor.

They selected me captain.

We made him chairman.

NB: Complement: When a noun gives more information about a subject or object, then that noun is called Complement.

Objective: When a noun or pronoun is used as the object of a verb then it is said objective case.

Examples:

I gave him.

They saw me.

She likes them very much.

Possessive: The possessive case denotes ownership or possession. The possessive answers the question- ‘Whose’

Examples:

This is her pen.

It was my car.

Your shirt is very nice.

Double possessive: Double possessive denote one out of many things of the same kind. Both (‘s) and ‘of’ are used to express it. (of + noun + ‘s = Double Possessive)

Examples:

A book of my friend’s.

The house of Rafiq’s.

The news of David’s.

Treble possessive: When ‘of’ is used before Double Possessive then it is called Treble Possessive (of mine, of ours, of theirs, of hers, of yours).

Examples:

This is a house of theirs.

The dog of ours is red.

He is a friend of mine.

Elliptical possessive: In some cases nouns denoting house, shop, etc. are omitted after the possessive. Such a possessive is called the Absolute or Elliptical Possessive.

Examples:

He went to Jon’s (Jon’s house).

I found him at the tailor’s (tailor’s shop).

The patient will go to St. Paul’s (Paul’s hospital).

NB: Case in Apposition: When two nouns are placed side by side and indicate the same person or thing, the second is said to be in apposition with the first.

Examples:

Akbar, emperor of India, was a patron of art.

Yesterday I met your uncle, the doctor.

Mr. Khan, teacher of the college, went there.

Thank you.