Explain and adverb phrase

An adverb phrase is simply two or more words that act as an adverb. It can modify a verb, adverb, or adjective and can tell "how", "where", "why", or "when."

An adverb clause which also modifies verbs, adverbs and adjectives; but, an adverb clause also includes a subject and a verb.

With great regretIn dismayLike a monk in meditationAs if I careIn silenceWith a song in my heartLike greased lightning.