The preposition that is attached to a phrasal verb does not start an actual prepositional phrase. For example, in the command "Turn off the light," the words off the light do not make up a prepositional phrase.

Question

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In "Turn off the light," "off" is part of the phrasal verb "turn off," not the start of a prepositional phrase. "The light" is the object of the verb phrase, not governed by "off" as a preposition.

The Preposition That Is Attached to a Phrasal Verb Does