A Practical English Grammar Exercises 1 Present and Past Tenses. Exercises 2 Future and Conditional Tenses. Exercises 3 Gerund, Infinitive and Participles. A.J.Thomnson and A.V. Martinet. Oxford University Press. ISBN: 0-19-432741-8. 12x0,4x18,5 cm. 44 páginas. 5€ cada uno.