Use etiquette as the subject of a sentence. Because etiquette is a noun, place it in the subject portion of a sentence as the thing or the idea referred to by the verb. For example, write, "Elevator etiquette confuses many people." "Elevator etiquette" is the subject of the sentence.
Place etiquette in the predicate of a sentence as the direct object. A direct object is a direct result of the verb. For example, write, "The professor considers etiquette to be a waste of time." In this sentence, "etiquette" is the result of consider. The phrase "waste of time" is an "objective complement," which renames the direct object.
Use "etiquette" in the predicate of a sentence as the object of a preposition. For example, write, "The grandmother lectured the children about etiquette." In this sentence, "etiquette" is the object of the word "about" (the preposition) because it is the noun that follows the preposition. The words "about etiquette" make up a prepositional phrase.