Chapter 1: Present Tense Chapter 2: Stem-changing Verbs and Verbs with Spelling Changes. Chapter 3: Ser and estar Chapter 4: Preterit Tense Chapter 5: Imperfect Tense Chapter 6: Future and Conditional Tenses Chapter 7: Reflexive Verbs Chapter 8: Past Participles and Perfect Tenses Chapter 9: Passive Constructions Chapter 10: Gerund and Progressive Tenses Chapter 11: Subjunctive: Present and Present Perfect Chapter 12: Subjunctive: Imperfect and Past Perfect Chapter 13: Subjunctive in Adverb and Adjective Clauses Chapter 14: Commands Chapter 15: Infinitives Chapter 16: Nouns and Articles Chapter 17: Adjectives Chapter 18: Demonstratives and Possessives Chapter 19: Pronouns: Subject, Object, Prepositional Chapter 20: Relative Pronouns Chapter 21: Adverbs Chapter 22: Prepositions Chapter 23: Interrogative Words and Question Formation Chapter 24: Negative and Indefinite Words.