The true statement is:
Some words that are usually nouns can function as adjectives.
This is known as a "noun adjunct" or "attributive noun." For example, in the phrase "chicken soup," "chicken" functions as an adjective describing the type of soup.
The other statements are not correct:
- An adjective modifies a noun or pronoun, not a verb or adverb.
- An adverb can modify verbs, adjectives, or other adverbs, but cannot modify nouns or pronouns.
- Adverbs do not modify adjectives; this statement is inaccurate. Adverbs can modify adjectives, but adjectives cannot modify adverbs.