* Subjects perform the action: The subject of a sentence is the person, place, or thing that performs the action of the verb.
* Verbs describe the action: Verbs express the action or state of being of the subject.
Example:
* "The dog barked."
* Subject: "The dog" (performs the action)
* Verb: "barked" (describes the action)
Why it doesn't work:
If we try to make the verb "barked" the subject of another verb, it doesn't make sense:
* *"Barked the cat."* This sentence is grammatically incorrect because "barked" is an action, not a thing that can perform an action.
Instead, we need to use a noun or pronoun as the subject:
* "The cat barked."
Key point: A verb needs a noun or pronoun as its subject to function properly.