Prepositional phrases can modify a verb. Sometimes, the preposition tells how something is done.
The man walked with a limp. The phrase with a limp tells how he walked.
Bob arrived on the bus. The phrase on the bus tells how Bob arrived.
A prepositional phrase can also tell when something is done.
Mary practiced the piano after dinner.
I will help you in one minute.
We played catch until dark.
Prepositional phrases modify verbs by telling how or when something is done.
▶Now you try it. Find the prepositional phrase in this sentence that tells how or when something is done. John wants to study in the morning. Did you find the phrase? Good for you!