Here's a breakdown:
* Noun: A word that names a person, place, thing, or idea.
* Pronoun: A word that replaces a noun (e.g., he, she, it, they).
* Action: What the subject does.
* Description: What is said about the subject.
Examples:
* The cat sat on the mat. (The simple subject is "cat".)
* She went to the store. (The simple subject is "she".)
* The red car was parked in the driveway. (The simple subject is "car".)
* John is a good student. (The simple subject is "John".)
Important Note: The simple subject might include modifiers (words that describe the noun or pronoun), but the core of the simple subject is the noun or pronoun itself.