Here's why:
* Subject: The subject of a sentence is the noun or pronoun that performs the action of the verb.
* Complete Subject: This includes the subject and any words that modify or describe it.
Example:
* The playful puppy chased the ball.
* Complete Subject: The playful puppy
* Subject: puppy
In this example, the "puppy" is the subject, and "the playful" modifies it, making "The playful puppy" the complete subject. There's only one complete subject in this sentence.
Note: You can have multiple simple subjects connected by conjunctions, forming a compound subject.
Example:
* The puppy and the cat played together.
* Compound Subject: The puppy and the cat
* Simple Subjects: puppy, cat
While there are two simple subjects, they are joined to form one complete subject, which performs the action of the verb "played."