15. A pronoun must agree with its antecedent in gender, number, and person ([p. 55]).
16. Relative pronouns connect dependent clauses with main clauses by referring directly to a substantive in the main clause.
This substantive is the antecedent of the relative ([p. 66]).
A relative pronoun must agree with its antecedent in gender, number, and person.
The case of a relative pronoun has nothing to do with its antecedent, but depends on the construction of its own clause ([p. 68]).
17. A relative pronoun in the objective case is often omitted ([p. 69]).
18. The relative pronoun what is equivalent to that which, and has a double construction:—(1) the construction of the omitted or implied antecedent that; (2) the construction of the relative which ([p. 71]).
19. The compound relative pronouns may include or imply their own antecedents and hence may have a double construction ([p. 72]).
The compound relatives are sometimes used without an antecedent expressed or implied ([p. 72]).
20. An adjective is said to belong to the substantive which it describes or limits (pp. 5, 75).