Final answer:
Prepositional phrases can act as subject complements, gerund phrases function as nouns, and antecedents are the nouns or pronouns that pronouns replace.
Step-by-step explanation:
Prepositional phrases can act as subject complements when they follow the noun or pronoun they modify. For example, in the sentence 'On that day, Francis became a criminal.', the prepositional phrase 'On that day' is acting as a subject complement. Prepositional phrases can also function as adverbials or modify other prepositional phrases.
Gerund phrases are -ing verbs that function as nouns. They can be placed anywhere in the sentence where a noun would normally function. An example of a gerund phrase is 'Hiking through a snow drift gets a lot easier.'
The antecedent is the noun or pronoun that a pronoun replaces. The pronoun appears later in the sentence or in a previous sentence. For example, in the sentence 'John lost his wallet.', 'John' is the antecedent of the pronoun 'his'.