Which words in the sentence make up the adverb phrase?
which word does it modify?

johannes gutenberg, a famous inventor, lived during the fifteenth century.

a.
during the fifteenth century; modifies inventor

b.
a famous inventor; modifies gutenberg

c.
johannes gutenberg; modifies inventor

d.
during the fifteenth century; modifies lived

postive, comparative, superlative - good, better, best

recall how we defined nouns as words capable of having plurals and possessive endings. adjectives (and their first cousin, the adverb) also have a feature that distinguishes them. they come in three states. first, the raw adjective—in its positive state—merely describes the noun modified; it doesn’t care about how this particular person or thing stacks up against other members of the same noun class