Book 1: Present and Past Tenses. ISBN: 0194327418 / 9780194327411.
Book 2: Future and Conditional Tenses. ISBN: 0194327426 / 9780194327428.
Book 3: Gerund, Infinitive, and Participles. ISBN: 0194327434 / 9780194327435
Book 4: Verb + Preposition / Adverb Combinations. ISBN: 0194327442 / 9780194327442.
Book 5: Auxiliary Verbs. ISBN: 0194327450 / 9780194327459.
Book 6: Indirect Speevh and Passive Voice. ISBN: 0194327469 / 9780194327466.
Book 7: Articles, Prepositions, Relative Pronouns etc. ISBN: 0194327477 / 9780194327473.
Book 8: Present, Past & Past Perfect Tenses. ISBN: 0194327485 / 9780194327480.
Book 9: Future Forms & Reported Speech. ISBN: 0194327493 / 9780194327497
Book 10. Conditionals & Unreal Pasts, Gerund, Infinitive & Passive. ISBN: 0194327507 / 9780194327503
Oxford University Press OUP. Rústica. Buen estado.
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