Hi- I'm not 100% sure on this one, but sometimes a prepositional phrase can act as both --depending on the focus: We split the money among the people in the room An prepositional phrase acting as an adverb answers how, when, where, how much, and why In this case, "in the room" answers where (the money was split)--it modifies the verb Acting as an adjective, it answers which or what kind "in the room" can modify "the people" answering what (people) We saw a jaguar in a cage I would say most of the time we are focused on where we saw the jaguar (adverb)--modifying "saw" and not what kind of jaguar (the "in the cage" jaguar)--making it act as an adjective. Does that make sense? I tend to nat make sense when I shorten my answers.
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