Here's why:
* Phrase: It's a group of words that act together as a single unit.
* Adverbial Phrase: It modifies a verb, adjective, or another adverb by providing information about time, place, manner, or degree.
For example:
* I am working right now. (modifies the verb "working" by indicating time)
While "right" can sometimes be an adjective, in this context, it's part of the phrase "right now" which acts as a single unit.