Personal pronouns are used to represent people in a sentence.

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Unique among pronouns, personal pronouns experience a wide range of inflection.

They change form to reflect specific meaning in different contexts.

Personal pronouns can inflect according to grammatical person, but they also change to reflect grammatical number, gender, and case.

INFLECTIONS

Gender	Grammatical Person	Grammatical Number	Subjective Case	Objective Case	Possessive Case
Neutral	1st person	Singular	I	Me	Mine
Neutral	1st person	Plural	We	Us	Ours
Neutral	2nd person	Singular	You	You	Yours
Neutral	2nd person	Plural	You	You	Yours
Masculine	3rd person	Singular	He	Him	His
Feminine	3rd person	Singular	She	Her	Hers
Neutral	3rd person	Singular	It	It	Its
Neutral	3rd person	Plural	They	Them	Theirs

Example 1:
The gum was stuck under the desk and I couldn't get it off.

I	Gender	Grammatical Person	Grammatical Number	Case
I	Neutral	First	Singular	Subjective

It	Gender	Grammatical Person	Grammatical Number	Case
It	Neutral	third	Singular	objective

Example 2:
When she heard the sirens, she knew something was seriously wrong.

She	Gender	Grammatical Person	Grammatical Number	Case
She	Feminine	Third	Singular	Subjective

Example 3:
We cook every day.

We	Gender	Grammatical Person	Grammatical Number	Case
We	Neutral	First	Plural	Subjective