The subject of a sentence names who or what the sentence is about. The simple subject is always a noun or a pronoun; the complete subject consists of the simple subject and any words or word groups modifying the simple subject.
Complete subject
To find the complete subject, ask Who? or What?, insert the verb, and finish the question. The answer is the complete subject.
Who or what lasts for many years? The devastating effects of famine.
Who or what are made into movies? Adventure novels that contain multiple subplots.
Who or what can vary greatly? Income levels. Sentences frequently open with modifiers such as Within one city neighborhood; it is not safe to assume that the subject must always appear first in a sentence.
Simple subject
To find the simple subject, strip away all modifiers in the complete subject. This includes single-word modifiers such as the and devastating, phrases such as of famine and Within one city neighborhood, and subordinate clauses such as that contain multiple subplots.
A sentence may have a compound subject containing two or more simple subjects joined with a coordinating conjunction such as and or or.
Understood subject
In imperative sentences, which give advice or issue commands, the subject is an understood you.
Subject after verb
Although the subject ordinarily comes before the verb, occasionally it does not. When a sentence begins with There is or There are (or There was or There were), the subject follows the verb. The word There is an expletive in such constructions, an empty word serving merely to get the sentence started.
Sometimes a writer will invert a sentence for effect.
In questions, the subject may appear before the verb, after the verb, or between the helping verb (HV) and main verb (MV).
NOTE:The ability to recognize the subject of a sentence will help you edit for a variety of sentence issues: fragments, subject-verb agreement, choice of pronouns such as I or me, missing subjects, and repeated subjects.
Exercises:
Subjects 1
Subjects 2
Related topics:
Sentence fragments
Subject-verb agreement
Pronoun case (I vs. me)
Not omitting subject
Not repeating nouns or pronouns