When?

Here’s another snippet. It has two prepositional phrases. What do they tell us?

When we got back to school on Monday, there was no snow left.

Wonder(2012)

The first phrase tells us where Jack and his friends got back to (school).

The second tells us when they got there (Monday).

This is the other most common use of prepositional phrases: to indicate a time when an action occurs

Let's write some variations. We'll leave the place the same and just change the time.

When we got back to school after lunch, there was no snow left.

When we got back to school in the afternoon, there was no snow left.

Write your own variation, using a different prepositional phrase for the time.

Before we move on, notice how this prepositional phrase was in the middle of the sentence. Clearly they can appear in multiple places.

(And if you know what a clause is, you might notice that while the phrase is in the middle of the sentence, it's still at the end of a clause.)