What is the difference between object of the preposition and predicate nominative?

Answer 1

An object of the preposition is a noun that ends the prepositional phrase as in the following sentence: She looked at the nurse. The prepositional phrase is "at the nurse." The preposition is "at" and the objective if the preposition is "nurse." A predicate nominative follows a linking verb and renames the subject as in the following sentence: My sister is a nurse. The linking verb is "is" and the predicate nominative is "nurse" which renames the subject "sister."