I) What is the difference between an adverb and an adverb phrase? Explain and give an example

For example, if you were to say "I went into town to visit my friend," the adverbial phrase to visit my friend would clarify why you went into town. This can be considered an adverbial phrase because it describes the verb went. Another common use for adverbial phrases is to describe the frequency of an action.

Explanation:

Adverbs modify verbs, adjectives, and other adverbs. Meanwhile, adverbials act like adverbs to modify a verb or a clause. Adverbials can consist of a single word or an entire phrase.