Adverb Phrases

Hopefully, you are seeing a pattern in types of words and their accompanying phrases by now. Also, you may have guessed that an adverb phrase is a phrase constructed around an adverb. If so, another gold star for you!
Adverb phrase: a phrase with an adverb at its head
     Adverbs and adjectives share many commonalities, and this carries into their phrases, as well. Many of the modifiers used for adjectives are used for adverbs. In particular, intensifiers are often used in both adjective and adverb phrases.
John walks really slow.
int    adv
In addition, adverb phrases are commonly formed with complements, just like adjective phrases. These are called (wait for it) adverb complements.
Adverb complement: an element following an adverb phrase that completes the meaning of the adverb.
     For example, “Mary fell harder than a box of bricks.” Harder is the adverb, but box of bricks completes the meaning of the adverb.