1. The subject of a verb is in the nominative case ([p. 41]).
2. A substantive standing in the predicate, but describing or defining the subject, agrees with the subject in case and is called a predicate nominative ([p. 41]).
3. A substantive used for the purpose of addressing a person directly, and not connected with any verb, is called a vocative.
A vocative is in the nominative case, and is often called a nominative by direct address or a vocative nominative ([p. 42]).
4. A substantive used as an exclamation is called an exclamatory nominative or a nominative of exclamation ([p. 42]).
5. A substantive, with a participle, may express the cause, time, or circumstances of an action.
This is called the absolute construction.
The substantive is in the nominative case and is called a nominative absolute ([p. 144]).
6. The possessive case denotes ownership or possession ([p. 43]).
7. The object of a verb or preposition is in the objective case ([p. 47]).