|If a pronoun is the subject of a sentence, it must be expressed as a subject; and if it is the object of a sentence, it must be expressed as an object.
Subject pronouns are I, we, you, he, she, it, they, and who.
Object pronouns are me, us, you, him, her, it, them, and whom.
To check whether 'who' or 'whom' should be used in a sentence:
Directions: Correct the following sentences. Write five more examples of pronoun case errors and correct them.