What is the prestional phrase in this sentence water flowed under bridge?

The prepositional phrase in the sentence "water flowed under the bridge" is "under the bridge".

Here's why:

* Prepositional phrases start with a preposition (like "under") and include a noun or pronoun (like "bridge").

* They function as adjectives or adverbs, modifying other parts of the sentence.

* In this case, "under the bridge" tells us where the water flowed.