Here's why:
* Prepositional phrases consist of a preposition (in this case, "over" and "above") followed by an object (in this case, the implied object is the noun or pronoun that the phrase modifies).
* They function as adjectives or adverbs, modifying nouns or verbs.
Example:
* "In addition to the regular fee, there's a over and above charge for expedited service." (Here, "over and above" modifies the noun "charge" and acts as an adjective.)
Let me know if you'd like more examples!