Answer :

A simple subject is what the sentence is mainly talking about, the noun or the main word or words on what the sentence is about. There is also a simple predicate which is what the person or people in the sentence are doing. For example: Bob walked down the street. Bob is the simple subject and walked is the simple predicate.

Answer:

A simple subject is a subject that has just one noun as the focus of the sentence.

Explanation:

a subject is a noun, which is a person, place, thing, or idea. Every sentence has to have two parts: a subject and a verb (or predicate). ... When we have a simple subject, there is only one noun that completes the action in the sentence