When a personal pronoun is used as a direct object, an indirect object, or the object of a preposition, it must be in the objective case (me, us, you, him, her, it, them).
Exercise: Pronoun case (such as I vs. me) 1
Exercise: Pronoun case (such as I vs. me) 2
Exercise: Pronoun case (such as I vs. me) 3
Exercise: Pronoun case: review 1
Exercise: Pronoun case: review 2
Related topic:
Subjects and objects of infinitives
direct object A word or word group that receives the action of the verb.
indirect object A noun or pronoun that names to whom or for whom the action of a verb is done. An indirect object always precedes a direct object: Mara wrote Dan a helpful critique.
object of a preposition The noun or noun equivalent that follows a preposition.