Final answer:
In the sentence 'The old man walked down the road,' the noun is 'man.' The adjective is 'old,' the verb is 'walked,' and the adverb is 'slowly.'
Step-by-step explanation:
In the sentence 'The old man walked down the road,' the noun is 'man.' A noun is a person, place, thing, or idea, and in this case, 'man' is a person.
An adjective is a word that describes a noun. In the sentence 'The old man walked down the road,' the adjective is 'old.' It describes the noun 'man.'
A verb is a word that expresses an action or a state of being. In the sentence 'The old man slowly walked down the road,' the verb is 'walked.'
An adverb is a word that describes a verb, adjective, or another adverb. In the sentence 'The old man slowly walked down the road,' the adverb is 'slowly.' It describes how the man walked.