This document discusses identifying the subject of a sentence. It explains that a sentence has two elements: a subject and a predicate. The subject is who or what the sentence is about. There are two steps to determine the subject: 1) identify the verb, and 2) ask "who?" or "what?" before the verb. The answer to that question is the subject. It provides examples of identifying subjects and notes that sentences can have compound subjects or multiple subjects if there are multiple verbs. Verbs must agree with their subjects.