This document discusses phrasal verbs, which are verbs combined with particles that change the verb's meaning. It provides examples of how adding "on" or "off" to the verb "turn" changes its meaning. The document explains that phrasal verbs can be separated if there is a direct object, placing the object between the verb and particle. If there is no direct object, a preposition after the phrasal verb indicates it cannot be separated. Sample sentences are provided to demonstrate phrasal verbs with and without objects.