Pronouns take the place of nouns. Personal pronouns have what is called case. Case means that a different form of a pronoun is used for different parts of the sentence. There are three cases: nominative, objective, and possessive. Many mistakes are made in the use of nominative and objective case pronouns. Memorizing each list will help you use them correctly.
Nominative case pronouns are I, she, he, we, they, and who. They are used as subjects, predicate nominatives, and appositives when used with a subject or predicate nominative.
Objective case pronouns are me, her, him, us, them, and whom. They are used as direct objects, indirect objects, objects of the preposition, and appositives when used with one of the objects. (We will learn about indirect objects and objects of the preposition in later lessons.) (You and it are both nominative and objective case.)
Possessive case pronouns are my, mine, your, yours, his, her, hers, its, our, ours, your, yours, their, and theirs. They are used to show ownership.
Instructions: Choose the correct form of the pronoun and tell why you chose it.
1. (Who, Whom) did you send?
2. The man saw (them, they) outside.
3. Had the girls met (he, him) before?
4. The boss helped (we, us), Tom and (I, me).
5. I saw (she, her) at the door.
–For answers scroll down.
1. Whom – direct object
2. them – direct object
3. him – direct object
4. us – direct object, me – appositive to a direct object
5. her – direct object
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from Daily Grammar Lessons Blog http://dailygrammarlessons.blogspot.com/2017/03/lesson-138-parts-of-sentence-pronouns.html