What Are Personal Pronouns? A personal pronoun

Subject and object pronouns
Personal pronouns can be either subjects or objects in a sentence. Subject pronouns are said to be in the nominative case, whereas object pronouns are said to be in the objective case.

Person	Nominative	Objective
First singular	I	me
Second singular	you	you
Third singular	he, she, it	him, her, it
First plural	we	us
Second plural	you	you
Third plural	they	them

The interrogative pronouns for all three persons are the same: who (nominative) and whom (objective). Many people get confused about when to use the interrogative objective pronoun whom, but it is quite easy to learn.
Mrs. Khan asked that the package be delivered to her at the office. (her = third person singular objective)
To whom should I address my letter? (whom = interrogative objective; I = first person singular nominative)
We would like to invite Stacy to join us for dinner. (we = first person plural nominative; us = first person plural objective)