Final answer:
A pronoun serving as the object of a prepositional phrase must be in the objective case, such as 'me', 'us', 'him', 'her', 'it', 'them', and 'whom'. This is essential for grammatical accuracy and effective communication.
Step-by-step explanation:
When a pronoun serves as the object of a prepositional phrase, it must be in the objective case. Pronouns in the objective case function as objects within the sentence or prepositional phrase, such as me, us, him, her, it, them, and whom. These pronouns differ from those in the subjective case, which act as the subject of a sentence, and from those in the possessive case, which show ownership.
Understanding the correct use of pronoun case is essential in forming grammatically correct sentences. For example, 'Jasmine and I ordered pizza for dinner' shows the use of a subjective case pronoun, while 'The pizza was delivered to Jasmine and me' correctly uses an objective case pronoun following the preposition to. Proper knowledge of pronouns ensures clear and accurate communication.