2.7.24 Working with verbs, adjectives, relative pronoun, infinitives, and present active participles.

Rules to remember:
Relative pronouns agree in gender, number, with their antecedent. They get their case from their function in the relative pronoun clause.
Adjectives agree in gender, number, and case with the noun they modify.
Present active participles agree in gender, number, and case with the noun they modify.