Prepositional phrases are those groups of words that modify a noun, pronoun, or verb. They contain a preposition along with an object or any word that modifies the intended subject.
In the given sentence<em> "Do not leave without me"</em>, the prepositional phrase is "without me" as it modifies the verb "leave". And the type of phrase of this prepositional phrase is that it is an adverb phrase, for it modifies the verb of the sentence.
