Question

in the following sentence identify the part of speech of the iltalicized word. large fish swim swiftly in the sea

Answer 1

Large is an adjective.

Fish is a noun.

swim is a verb.

swiftly is an adverb because it answers the question How

in the sea would be a prepositional phrase. In being the preposition, the being an article, and sea being the object of the preposition. 

Hopefully this helped and good luck!!!  :)

Answer 2

Large is a noun. Fish is noun. Swim is a verb, it can also be a noun. Swiftly is an adjective, it qualifies a noun. "In" is an irregular verb. "The" is a preposition. Sea is a noun.