English employs a large number of phrasal verbs, consisting of a core verb and a particle which could be an adverb or a preposition; while the phrasal verb is written as two words, the two words are analyzed semantically as a unit because the meaning of the phrasal verb is often unrelated (or only loosely related) to the meaning of the core verb. For example, "turn off" has a meaning unrelated to "turn" in "Turn off the television set and the light".