"Arkene er fuldstændigt hvide."
Translation:The sheets are completely white.
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In this sentence, "Fuldstændigt" is an adverb modifying the adjective "hvide." Typically, adjectives agree with the nouns they modify, but adverbs are invariable. In this example, the ending -t on "fuldstændigt" helps you to recognize the word as an adverb. Does that help?