Objective / Accusative Case

First you need to know what an object is. If the subject of a sentence is doing something to someone, that someone or something becomes the object of the sentence.

Now it might help you if you know what the term "case" means. It's the grammatical function of a noun or pronoun, thankfully almost extinct in the English language, but we haven't buried it yet.

A noun or pronoun is in the objective case when it is used as a direct object, an indirect object, or an object.

A noun which is directly affected by the action of a verb is put into the objective case. In English we call this noun the "direct object" which is a little more descriptive of its function. It's the direct object of some action.

• Robert fixed the car.

In the example above, the "car" is in the objective case because it's the direct object of Robert's action of fixing.

Pronouns are inflected to show the objective case

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PERSONAL PRONOUN
Objective/Accusative
Referring to the object in a sentence
Me
You
Him
Her
It
Us
Them
Whom

For example:

• The web site gave Lynne a headache.
• Mum gave us the money.
• She gave him the book.

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FORMATION OF THE POSSESSIVE CASE

(1) When the noun is singular, the Possessive Case is formed by adding‘s to the noun; as,

The boy’s book; the king’s crown.

Note- the letter  s is omitted in a few words too many hissing sounds would come together; as,

 For conscience’ sake; for goodness’ sake;

For justice’ sake; for Jesus’ sake; Moses’ laws.

(2))When the noun is Plural, and ends in s, the Possessive Case is formed by adding only an apostrophe; as,

Boys’ school; girl’s school; horses’ tails..

(3)When noun is Plural but does not end in s, the Possessive sign is formed by adding’s as

  Men’s club; children’s books.

 When a noun or a title consists of several words , the Possessive sign is attached only to the last word; as,

 The King of Bhutan’s visit.

The Prime Mister of Mauritius’s  speech.

When two nouns are in apposition the possessive sign is put to the latter only; as,

    That is Tagore the poet’s house.

also when two nouns are closely connected, the possessive is put to the latter; as,

 Karim and Salim’s bakery.

William and Mary’s reign.

Each of two or more connected nouns implying separate possession must take the possessive sign; as,

  Raja Rao’s and R.K. Narayan’s novels.

Goldsmith’s and Cowper’s poems.