The document discusses the key components of a simple sentence in English: subject, verb, and optionally object or additional information. A simple sentence must have at least a subject and a verb. The subject is who or what the sentence is about, and can be found by asking "who" or "what" the sentence is about. The verb is what the sentence says about the subject, and can be found by asking what the sentence says about the subject. An object receives the action of the verb and can also be included. Additional information, usually an adverb, provides details like place, time, or manner.