The adverb isn’t modifying any verb here, but the adjective beautiful to form the predicative adjective phrase incredibly beautiful , which relates to the subject the stars in the night sky . Look is often called a ‘linking verb’ when it takes a predicative complement.
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Anonymouscan "beautiful" be used as a verb?No. It's an adjective.
AnonymousThe stars in the night sky looked incredibly beautiful.the answer is: adverb = incredibly, and beautiful is underlined'incredibly' is an adverb of degree. It says how beautiful it looked.