Here's why:
* Noun Clauses: These are groups of words that function as nouns. They have a subject and verb and can act like a single noun in a sentence. They often start with words like "that," "what," "who," "where," "when," "why," or "how."
* Subjects: Subjects are the people, places, things, or ideas that perform the action of the verb.
Example:
* What you said surprised me.
In this sentence:
* "What you said" is the noun clause. It acts as the subject of the verb "surprised."
More examples:
* Whoever wins the contest will get a prize.
* That the team lost was a disappointment.
* How to solve this problem is a mystery.
Therefore, noun clauses can be subjects, objects, complements, or even appositives within a sentence.