Anonymous We were at the mall. at the mall is an adverbial Anonymous She appears to be sick. to be sick is not a prepositional phrase but an infinitive phrase.
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AnonymousWe were at the mall.
AnonymousShe appears to be sick.
AnonymousCan a predicate adjective/noun be found in a prepositional phrase?No. The noun in a prepositional phrase would never be called a predicate noun.