Some examples of noun clauses:

 

A noun clause is a dependent clause that functions as a noun within a sentence. 

Subsequent are some examples of noun clauses:

Subject:

 What he said was very interesting. (In this sentence, "what he said" is the subject of the sentence and functions as a noun clause.)

Direct object: 

I know that she is coming. ("That she is coming" is the direct object of the verb "know" and functions as a noun clause.)

Indirect object:

 He gave whoever asked for it a copy of the book. ("Whoever asked for it" is the indirect object of the verb "gave" and functions as a noun clause.)

An object of a preposition: 

She is interested in whatever he is selling. ("Whatever he is selling" is the object of the preposition "in" and functions as a noun clause.)

Predicate nominative:

 My goal is to learn as much as I can. ("To learn as much as I can" is the predicate nominative and functions as a noun clause.)

Noun clauses are often introduced by words like that, if, whether, why, who, what, and how. They can be used to add complexity to a sentence and express more complex ideas.