4. Prepositional Phrases
Prepositional phrases consist of a preposition and its object. They most commonly function as adverbs, but they can also be adjectival.
Preposition + Noun, Pronoun, Gerund
Preposition + Modifier(s) + Noun, Pronoun, Gerund
Examples.
A boy on the roof is singing a song. (As adjective)
The man in the room is our teacher. (As adjective)
She is shouting in a loud voice. (As adverb)
He always behaves in a good manner. (As adverb)