Here's a breakdown:
* Simple Subject: The noun or pronoun that performs the action of the verb in a sentence.
* Example: The cat sat on the mat. ("Cat" is the simple subject.)
* Verb: The word that describes the action or state of being of the subject.
* Example: The cat sat on the mat. ("Sat" is the verb.)
Think of it this way: the subject is *who* or *what* is doing something, and the verb is *what* they are doing.