have disappeared, wholly, or in part, and the Prepositions do the work which they once did. For example we say of a man where the Greeks said ἀνθρώπου and to a man where the Greeks said ἀνθρώπῳ. In the Greek of the New Testament we can see this process going on. Prepositions are used with the case of a noun, where the case alone sufficed in Classical Greek. For example the simple Dative was used in Classical Greek to express the Instrument; but in later Greek ἐν with the Dative was so used.