Prepositional phrases can be adjectives (they modify a noun or pronoun), or adverbs (they modify a verb or adjective) I like the girl in the green sweater. "in the green sweater" obviously describes "the girl". We went "to the grocery store" - "to the grocery store" answers "where" (a typical adverb type of questions), so it modifies "went" Adverbs modify adjectives, and can answer "how", or "how much" She is very beautiful.
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