the adverb phrase

A prepositional phrase that answers any of these questions—When? Where?
How? Why? Under what conditions? or To what degree?—is an adverb phrase.
If you can logically move the prepositional phrase within the sentence, it
is probably an adverb phrase. Remember that an adverb phrase contains
no verb.

The adverb phrases in these sentences are underlined.

We walked after dinner. (When?)
The little boys and girls ran into the hallway. (Where?)
Audrey, one of the chaperones, certainly handled herself with class
yesterday. (How?)
John built the wooden shed with much assistance. (Under what
conditions?)
The underdog candidate won the state election by a landslide. (To
what degree?)