The L component words of this sentence are the content words "John, eat, and pizza". Each word only contains lexical information that directly contributes to the meaning of the sentence. The L component is often referred to as the base or inner component, due to the inwards positioning of this constituent in a phrase structure tree. It is evident that the string of words ‘John eat pizza’ does not form a grammatically well-formed sentence in English, which suggests that E component words are necessary to syntactically shape and structure this string of words. The E component is typically referred to as the outer component that shapes the inner L component as these elements originate in a position that orbits around the L component in a phrase structure tree. In this example, the E component function word that is implemented is "did". By inserting this word, two types of structures are added to the expression: tense and clause typing. The word "did" is a word that is used to inquire about something that happened in the past, meaning that it adds the structure of the past tense to this expression. In this example, this does not explicitly change the form of the verb, as the verb "eat" in the past tense still surfaces as "eat" without any additional tense markers in this particular environment. Instead the tense slot can be thought of as being filled by a null symbol (∅) as this past tense form does not have any phonological content. Although covert, this null tense marker is an important contribution from the E component word "did". Tense aside, clause typing is also conveyed through the E component. It is interesting that this function word "did" surfaces in the sentence initial position because in English, this indicates that the string of words will manifest as a question. The word "did" determines that the structure of the clause type for this sentence will be in the form of an interrogative question, specifically a yes-no question. Overall, the integration of the E component with the L component forms the well-formed sentence, "Did John eat pizza?", and accounts for all other utterances found in human languages.