An adverbial phrase actually has the following which a prepositional phrase doesn't have: D. A subject and a verb.
What is prepositional phrase?
A prepositional phrase is known to be a group of words that have a preposition and its object and any word that actually modify the object.
An adverbial phrase refers to a group of two or more words which acts like an adverb. It is usually used to add more details to a verb, adjective, or other adverbs in a sentence.
We can see that an adverbial phrase has a subject and a verb which is different from a prepositional phrase.
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