A clause that may be used as the object of a preposition is a(n) __

noun clause

adjective

A clause that may be used as the object of a preposition is a noun clause.

To identify a noun clause, you can follow these steps:

1. Look for a word or phrase that functions as a preposition (e.g., in, on, at, by, before, after, etc.).
2. Identify the noun or pronoun that comes after the preposition.
3. Determine if the noun or pronoun is a clause by checking if it contains a subject and a verb.

If the noun or pronoun after the preposition contains a subject and a verb, it is a clause, specifically a noun clause. It can act as the object of the preposition.

Here is an example:

Preposition: "in"
Noun Clause: "What he said"

Example Sentence:
"He believes in what he said."

In this example, "in" is the preposition, and "What he said" is the noun clause functioning as the object of the preposition.