Final answer:
The adverb in the sentence 'Derek is incredibly fascinated in codes' is 'incredibly' as it modifies the verb phrase 'is fascinated.' There is no standalone adjective modifying a noun in this sentence.
Step-by-step explanation:
In the sentence "Derek is incredibly fascinated in codes," the word "incredibly" serves as the adverb and there is no adjective. The adverb "incredibly" is modifying the adjective "fascinated," describing the extent of Derek's interest in codes. Understanding the roles of adverbs and adjectives can help clarify the function of words within a sentence.
Adverbs often answer questions about the verb, adjective, or other adverbs, and can be identified because many end in -ly. Although there is no adjective directly modifying a noun in this sentence, "fascinated" is a past participle acting as a part of the verb phrase "is fascinated" and is described by the adverb "incredibly."