Which sentence includes a prepositional phrase

The cat is swishing its tail
The test was moved to Wednesday
I will try to memorize the poem
Monday is the last day to sign up

The test was moved to Wednesday.

The sentence "I will try to memorize the poem" includes a prepositional phrase.

The sentence that includes a prepositional phrase is: "I will try to memorize the poem."

To determine if a sentence includes a prepositional phrase, we need to identify a preposition and its object within the sentence. A prepositional phrase is made up of a preposition (a word that shows the relationship between a noun/pronoun and another word in the sentence) and its object (the noun/pronoun that the preposition is referring to).

In the given sentence, the preposition is "to" and its object is "poem." Therefore, "to memorize the poem" is a prepositional phrase.