Here's why:
* Subject: This is the person, place, or thing that performs the action of the verb.
* Verb: This describes the action or state of being of the subject.
Example:
* The dog barked. (Subject: The dog, Verb: barked)
Without a subject and a verb, a group of words is not considered a clause. For example, "Running quickly" is not a clause because it lacks a subject.
Note: There are different types of clauses (independent and dependent), but both must contain a subject and a verb.