Here's why:
* Prepositional phrases consist of a preposition (in this case, "on") followed by its object (the noun "table").
* They function as adjectives or adverbs within a sentence, modifying other words.
Examples:
* Adjective: The book on the table is mine. ("on the table" modifies "book")
* Adverb: I left my keys on the table. ("on the table" modifies "left")
Additionally, "on the table" can also be used as an idiom, meaning "under consideration" or "being discussed".
For example: "The proposal is on the table, and we'll vote on it tomorrow."