Lucy realized that she had made a mistake on the test.


How is the noun clause used in that sentence?

Since the clause answers "what?" after the verb, it's used as a direct object.

thank you!! what type of clause is than the sofa?

It's probably an adverb clause -- but you need to post the entire sentence to be sure.

In the given sentence, the noun clause is "that she had made a mistake on the test."

A noun clause is a type of dependent clause that functions as a noun in a sentence. It can act as a subject, object, complement, or an object of a preposition.

To identify a noun clause, we can look for the following characteristics:
- It begins with a subordinating conjunction (e.g., that, whether, if, why, how, etc.).
- It contains a subject and a verb.
- It functions as a noun within the sentence.

In this case, the noun clause "that she had made a mistake on the test" is functioning as the direct object of the verb "realized." It answers the question "what did Lucy realize?"

To determine the use of a noun clause in a sentence, you can follow these steps:
1. Identify the clause that starts with a subordinating conjunction.
2. Analyze how that clause functions within the sentence:
- Is it acting as a subject?
- Is it functioning as an object (direct object, indirect object, or object of a preposition)?
- Is it serving as a complement (predicate nominative or predicate adjective)?
- Is it functioning in any other noun-like capacity?