He vs him / she vs her / they vs them = pronouns
Pronouns substitute for nouns.
He / she / they = subject pronouns
Used when the pronoun is the subject of the sentence.
Ex: ______ did the job.
I, you, he, she, it, we, they, what, who are subject pronouns.
Him / her / them = object pronouns
Me, you, it, him, her, us, them, and whom are object pronouns.
The subject pronoun (he / she / they) goes before the object pronoun (him / her / them) in a sentence.
Ex: He looks like Tom Hanks. (He = subject, Tom Hanks = object)
Or: Tom Hanks looks like him. (Tom Hanks = subject, him = object)
Ex: She loves him. (She = subject, him = object)
Or: He loves her. (He = subject, her = object)