Subject Pronouns: These are used to replace nouns that have already been stated within a sentence. They're used to avoid repetitive speech. Subject pronouns are:
I
You
He/She/It
We
You
They
Here is an example of using a subject pronoun to replace a noun.
Mike went outside to go buy lunch. However, he couldn't find his wallet.
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Object pronouns: These are used as the object of the verb and the form of the pronoun changes.
Me
You
Him
Her
It
Us
You
Them
My brother enjoys going for walks every evening. It relaxes him.
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Possessive Adjective Pronouns: This type of pronoun describes the ownership of a noun which it is modifying.
My
Your
His
Her
Its
Our
Your
Their
That is her book over there on the table.
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Adjective Pronouns: Used to describe the ownership of a of a noun that has previously been referenced to the owner.
Mine
Yours
His
Hers
Its
Ours
Yours
Theirs
Who's house is this? I think it's theirs.
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Reflexive Pronouns: This is a form of a pronoun that refers back to the subject of a sentence. These are:
Myself
Yourself
Himself
Herself
Itself
Ourselves
Yourselves
Themselves