+227.+ +A pronoun must agree with its antecedent.+
+Use the subject form of the pronoun if the pronoun is the subject of
the sentence.+
+Use the object form when the pronoun is the object of a verb or a
preposition.+
+Use the compound personal pronouns only in their reflexive or emphatic
use.+
+With all forms of the verb _be_, use the subject form of the
pronouns.+