Prepositional phrases enhance sentence structure by providing additional context and description.
A fog blew in as the crickets chirped.
Adding a prepositional phrase to the sentence can be done to enhance the description and provide more context. The option that does this effectively is: 'A fog blew in around the trees as the crickets chirped.'
Prepositional phrases, when used correctly, contribute to the flow and richness of the sentence structure.
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