494 Thus far ([451-493](file:///x:/Departments/Classics_Texts/schoolgrammarofa00goodrich_porson/HTML%20Files/Chapter-451.html)) sentences have been treated rather as wholes, the treatment centering in the verb as the backbone of the sentence. In the following sections ([495-599](file:///x:/Departments/Classics_Texts/schoolgrammarofa00goodrich_porson/HTML%20Files/Chapter-495.html)) the separate parts of the simple sentence will be treated in this order: Verbs, Nouns (the Cases), Adjectives, Special Forms of Predication, The Article, Pronouns, Infinitives, Participles, Verbals, Prepositions. Of the verb, since the modes and tenses in simple sentences have already been explained, only Agreement and Voice remain to be described.