Final answer:
The prepositional phrase in the sentence is 'around the yard', which describes where the dog ran.
Step-by-step explanation:
The prepositional phrase in the sentence 'The dog ran around the yard' is 'around the yard'. This phrase indicates where the dog ran and consists of a preposition 'around' followed by a noun 'the yard'.
Prepositional phrases are used to provide additional information about the time, location, or direction and they act as adverbials or adjectivals in a sentence.
Prepositions are words that show the relationship between a noun or pronoun and other words in a sentence. They often indicate location, direction, time, or the relationship between different elements within a sentence.
Some common prepositions include "in," "on," "at," "for," "from," "to," "with," "about," and "under."