Final answer:
The prepositional phrase 'around the yard' functions as an adverbial phrase modifying the verb 'ran' in the sentence.
Step-by-step explanation:
The prepositional phrase in the sentence "The dog ran around the yard" is "around the yard." This prepositional phrase acts as an adverbial phrase because it is modifying the verb "ran," telling us where the dog ran.
In general, prepositional phrases provide additional details about the nouns or verbs in a sentence and can function as either adverbial or adjectival phrases, depending on what they modify.
The prepositional phrase in the sentence is "around the yard." It serves as an adverbial phrase, modifying the verb "ran." In this case, it describes where the dog ran.