How many prepositional phrases are in the following sentence?"Robert, why on earth won't you get your clothes off the floor?!"

A prepositional phrase begins with a preposition and includes its object. “On earth” is one phrase: “on” is the preposition, and “earth” is its object. “Off the floor” is another: “off” is the preposition, and “floor” is its object. “Why” and “you get” do not form prepositional phrases, so the correct choice is “Two: ‘on earth’ and ‘off the floor.’”

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