What is an simple subject?
i mean language arts
http://www.chompchomp.com/terms/subject.htm
A simple subject is the main noun or pronoun that a sentence is about. It is the person, thing, or idea that performs the action or is being described in the sentence. To identify the simple subject in a sentence, you need to locate the verb first. Then, ask yourself who or what is directly performing the action of that verb. That will be the simple subject. Let's take a look at an example:
Example sentence: "The cat is sleeping."
In this sentence, the verb is "is sleeping." To find the simple subject, ask yourself who is sleeping? The answer is "the cat." Therefore, "the cat" is the simple subject of the sentence.
Remember, the simple subject is the essential part of the sentence that the sentence is mainly about.