What grammatical jobs do pronouns perform?

Pronouns take the place of nouns in a sentence as the subject of a sentence or a clause, and as the object of a verb or a preposition. Examples:

Sentence using nouns: Aunt Jane made cookies for Jack and Jill.

Pronoun as the subject of the sentence: Shemade cookies for Jack and Jill.

Pronoun as the subject of clause: The cookies that she made are for Jack and Jill.

Pronoun as object of verb: Aunt Jane made themfor Jack and Jill.

Pronoun as object of preposition: Aunt Jane made cookies for them.

The pronouns called possessive adjectives do the job of adjectives to describe a noun as belonging to someone or something. Examples:

Aunt Jane often makes cookies. Hercookies are great.

Jack and Jill love their Aunt Jane.