The document discusses the subjunctive mood in Spanish. It defines the subjunctive as not being a tense but a mood that expresses possibility or subjectivity. The subjunctive is used when reporting something that may or may not be real or true, or that depends on something else. It provides examples of the subjunctive being used after verbs expressing will, influence, emotion, doubt, or denial when there is a change in subject between clauses. It also explains how to form the present subjunctive of regular and irregular verbs in Spanish.