Here's why:
* Clause: A group of words containing a subject and a verb.
* Noun Clause: A clause that functions as a noun in a sentence.
* Subject: The person, place, thing, or idea that performs the action of the verb.
Example:
* "What you said" is very important.
In this sentence:
* "What you said" is the noun clause.
* "What" is the subject of the clause.
* "said" is the verb of the clause.
* "is" is the verb of the main sentence.
* The entire noun clause "What you said" acts as the subject of the verb "is".