Consider which one of these sentences is the accurate expression

“It was he” or “It was him”

Using the correct pronoun depends on the pronoun’s case.

Case refers to the form of a noun or a pronoun that indicates its relation with the other words in a sentence.

Pronouns can be classified into three cases.

• Nominative (subjective) case
• Objective case
• Possessive case

• Nominative or subjective case: refers to a pronoun used as a subject or a subject complement in a sentence.
• Objective case: refers to a pronoun used as a direct object, an indirect object, or the object of a preposition.
• Possessive case: refers to a pronoun used to indicate ownership or possession.