1. A preposition: This is the word that introduces the phrase (e.g., "on," "in," "under," "with," "by," "for," "about," etc.)
2. An object: This is the noun or pronoun that follows the preposition and completes the phrase.
Example:
* "Under the table"
* "Under" is the preposition.
* "The table" is the object.
Here's a simple way to think about it:
The preposition tells you *where, when, how, or why* something is happening, and the object tells you *what* is involved.