A clause used as the object of a preposition is called a?

A clause used as the object of a preposition is called a prepositional phrase.

Here's a breakdown:

* Clause: A group of words containing a subject and a verb.

* Preposition: A word that shows the relationship between a noun or pronoun and another word in the sentence (e.g., on, in, to, from, with, for).

* Prepositional Phrase: A group of words beginning with a preposition and ending with a noun or pronoun (the object of the preposition).

Example:

* Sentence: "She walked through the door."

* Prepositional Phrase: "through the door"

* Preposition: "through"

* Object of the Preposition: "the door"

The entire phrase "through the door" acts as the object of the preposition "through," giving us more information about where she walked.