Answer:
An adverbial phrase is a group of words that have the same impact as an adverb. They modify a verb, adjective, adverb, clause or an entire sentence. Adverbial phrases can make a sentence more interesting and exciting. They tell us how, when, where, why and how long.
She tends to stay in her room.
so in this sentence, the adverbial word is Room.
I hope this helps you!