1. A preposition: This is the word that introduces the phrase and shows the relationship between the object and the rest of the sentence. Some common prepositions include "on," "in," "at," "to," "from," "with," "for," "by," "about," "under," "over," and "around."
2. An object of the preposition: This is the noun or pronoun that follows the preposition and tells us who or what is being affected by the relationship.
Example:
* "The cat sat on the mat."
In this sentence, "on" is the preposition and "the mat" is the object of the preposition. The prepositional phrase "on the mat" tells us where the cat sat.