CASES
Subjective

The subject of a sentence is in the subjective case.
The predicate nominative is in the subjective case.
Vocatives are in the subjective case.
I, you, he, she, it, we, they, who, which

Mary came home late. She made lunch.
It is she. Who is he?
Hey, you! Come here.

pronouns
Objective

Objects of a verb - direct and indirect -
are in the objective case.
Objects of prepositions are in the objective case.
The subject of an infinitive is in the objective case.
me, you, him, her, it, us, them, whom, which

We saw Mary at the beach.
I gave him an apple.
She told them the time.
John wants us to go home.

pronouns
Possessive

Possessives are in the possessive case.
The subject of a gerund is in the possessive case.
In making the possessive of nouns, add's if the noun
does not end in s. Add just the ' if it does.
my, your, his, her, its, our, their, whose, of which

It's my bike. John's house is over there.
Do you like her (Mary's) singing?
children's,James', Fred's

NOTE:

pronouns

SENTENCE
PATTERNS
SV

Subject + Verb

She sings every morning at 9 o'clock.
sv
He swam to Peru yesterday.
sv
She sings Beethoven every morning.
svo
He swam the English Channel.
svo
She gave him a potato.
svio
He told her his name.
svio
George was king in 1776.
svn
He had become king earlier.
svn
She was very cute.
sva
He seems quite intelligent.
sva
She found him intelligent.
svoc
They call me Mr. Chips.
svoc

SVO

Subject + Verb + direct Object

SVIO

Subject + Verb + Indirect object + direct Object

SVN

Subject + Verb + predicate Nominative

SVA

Subject + Verb + nominative Adjective

SVOC

Subject + Verb + direct Object + Complement