2. by the number of the definitive in connexion with the noun. See [§§ 14], [15].
§ 6. Nominal prefix a. Use the nominal prefix a with names of persons
1. when they stand as subject in a sentence;
2. when they follow any of the prepositions ki, i, hei, or kei.
Use it with personal pronouns (except ahau) only when they follow the prepositions ki, i, hei, or kei; or when they are repeated by way of explanation: not ordinarily when they stand as subject in a sentence.
Use it with names of places and nouns of locality ([§ 10]) only when they stand as subject in a sentence, or are repeated by way of explanation.
Examples.
Ka ora a Hoani, Hoani is well.
Kei a Tamati to hoiho, Your horse is in the possession of Tamati.
Ma Pita tenei, This is for Pita.