Adverb Phrase

Adverb Phrase consists of one or more adverbs as in:

The dog barks [very loudly].

                            Adv+Adv=Adv.Phr.

The last adverb in the phrase is the head of the Adv. Phr. (loudly). The other is the modifier (very).

vFunction

The only function of Adverb Phrase in a sentence is an Adverbial.

e.g. I run [very quickly].

                  Adv.Phr.: Adverbial