English/Inglés para todos los niveles
Beginner
Chapter 1—Using Be [4.4MB]
Chapter 2—Using Be and Have [3.1MB]
Chapter 3—Using the Simple Present [3.2MB]
Chapter 4—Using the Present Progressive [2.4MB]
Chapter 5—Talking About the Present [4.2MB]
Chapter 6—Nouns and Pronouns [3.0MB]
Chapter 7—Count and Noncount Nouns [2.1MB]
Chapter 8—Expressing Past Time, Part 1 [3.4MB]
Chapter 9—Expressing Past Time, Part 2 [2.0MB]
Chapter 10—Expressing Future Time, Part 1 [2.0MB]
Chapter 11—Expressing Future Time, Part 2 [1.8MB]
Chapter 12—Modals, Part 1: Expressing Ability [2.2MB]
Chapter 13—Modals, Part 2: Advice, Necessity, Requests, Suggestions [1.9MB]
Chapter 14—Nouns and Modifiers [2.2MB]
Chapter 15—Making Comparisons [2.3MB]
Intermediate
Chapter 1—Present Time [1.9MB]
Chapter 2—Past Time [2.1MB]
Chapter 3—Future Time [2.2MB]
Chapter 4—The Present Perfect and The Past Perfect [1.8MB]
Chapter 5—Asking Questions [3.8MB]
Chapter 6—Nouns and Pronouns [3.5MB]
Chapter 7—Modal Auxiliaries [3.7MB]
Chapter 8—Connecting Ideas [1.9MB]
Chapter 9—Comparisons [2.2MB]
Chapter 10—The Passive [1.6MB]
Chapter 11—Count / Noncount Nouns and Articles [3.4MB]
Chapter 12—Adjective Clauses [1.2MB]
Chapter 13—Gerunds and Infinitives [1.9MB]
Chapter 14—Noun Clauses [2.1MB]
Advanced
Chapter 1—Overview of Verb Tenses [274KB]
Chapter 3—Perfect and Perfect Progressive Tenses [636KB]
Chapter 8—Pronouns [856KB]
Chapters 9 & 10—Modals [926KB]
Chapter 11—The Passive [578KB]
Chapter 12—Noun Clauses [505KB]
Chapter 13—Adjective Clauses [437KB]
Chapter 14 & 15—Gerunds and Infinitives [297KB]
Chapter 17—Adverb Clauses [249KB]
Chapter 19—Connectives that Express Cause and Effect, Contrast, and Condition [448KB]
esquema_ingles3 cities.pdf