A preposition is a word that tells more about a noun or about the action in a sentence. In most cases, a preposition shows position. A preposition is always part of a prepositional phrase. The prepositional phrase begins with a preposition and ends with an object of the preposition.
Here is a sentence with the prepositional phrase in bold letters:
The cat is hiding under the stairs.
The phrase under the stairs tells the position of the cat. The word under is the preposition. The word stairs is the object of the preposition.
Here is another sentence using a prepositional phrase:
Jan drove her car to school.
The prepositional phrase to school tells where Jan drove her car. The phrase begins with the preposition to and ends with the object of the preposition school.
A preposition tells position and is always part of a prepositional phrase. A prepositional phrase begins with a preposition and ends with the object of the preposition. The object of a preposition is always a noun.
▶It’s your turn. Find the prepositional phrase in this sentence: Bob is walking to the store. Did you find the group of words that shows the position of Bob? Good for you!