The predicate nominative is in the subjective case.
Vocatives are in the subjective case.
I, you, he, she, it, we, they, who, which
It is she. Who is he?
Hey, you! Come here.
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
I gave him an apple.
She told them the time.
John wants us to go home.
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
Do you like her (Mary's) singing?
He swam to Peru yesterday.
She sings Beethoven every morning.
He swam the English Channel.
She gave him a potato.
He told her his name.
George was king in 1776.
He had become king earlier.
She was very cute.
He seems quite intelligent.
She found him intelligent.
They call me Mr. Chips.