The document discusses different types of subjects in sentences: agentive subjects are animate actors performing actions; instrumental subjects are inanimate tools causing events; affected subjects experience actions denoted by intransitive or "be" verbs. It also discusses agentive and instrumental subjects with verbs like "have" and "own" denoting possession, and perceptual verbs like "see" and "hear". Recipient subjects receive actions and can be associated with perceptual verbs like "taste", as in "John tasted the soup".