Pronouns that regard them as replacements for other expressions are fundamentally flawed.
A pronoun is a minimal linguistic form which refers to speaker(s), addressee(s), and other(s), and provides such grammatical information as person, number, gender, case, and humanness.
In English, pronouns and their antecedents must have the same person, number, and gender; that is, pronouns must agree with their antecedents on these grammatical categories.
English contains several different types of pronouns. We will list each type below according to the grammatical categories they represent.