A prepositional phrase is the preposition, the object of the preposition, and all the modifiers between the two.
We use prepositional phrases for many purposes, for example:
- as adverbials of time and place: We will be back in a few days.
.- as a postmodifier in a noun phrase: Helen is the girl in the red dress.
- to show who did something: The lion was killed by the hunter
- with double object verbs like give and get: They got a drink for me.
- after certain verbs, nouns and adjectives: The book belongs to me.
Remember that a prepositional phrase will never contain the subject of a sentence.