What is a prepositional phrase?

Object-object phrase is a phrase composed of preposition and object. The main function of prepositional phrases is to act as adverbials in sentences. In English, there are many such phrases, such as: on.

this

On the desktop

The desk is the object of the preposition on, which together form a prepositional phrase. For another example, in

this

River, yes

front

about

this

Classroom, etc

By the way, the object of a preposition can be used as a noun, pronoun or clause.