same case (Nom. or Obj.) as the word to which it relates.

III. A noun or pronoun used as possessive modifier is in the possessive
case.

IV. A noun or pronoun used as object or objective complement, or as the
principal word of a prepositional phrase, is in the objective case.

V. A noun or pronoun used as explanatory modifier is in the same case as
the word explained.

VI. A pronoun agrees with its antecedent in person, number, and gender.

With two or more antecedents connected by _and_, the pronoun is plural.

With two or more singular antecedents connected by _or_ or _nor_, the
pronoun is singular.

VII. A verb agrees with its subject in person and number.

With two or more subjects connected by _and_, the verb is plural.

With two or more singular subjects connected by _or_ or _nor_, the verb is
singular.

VIII. A participle assumes the action or being, and is used like an
adjective or a noun.

IX. An infinitive is generally introduced by _to_, and with it forms a
phrase used as a noun, an adjective, or an adverb.