An object, location, or person doing an action is referred to as a simple subject. A complete subject includes all of the subject's modifiers and adjectives, whereas a simple subject is a single word that describes the topic without any of them. Without any further qualifiers, the simple subject is just who or what is "doing" the verb. Simple Subject Illustrations The light bulb was created by Thomas Edison. The verb "invented" is being "done" in this sentence by "Thomas Edison." You must cut out superfluous words to get to the "who" or "what" of the statement in order to identify the simple subject.