Book excerpt: This book has been written to help students prepare for the Key Word Transformation part of the Use of English paper (grammar) of the Cambridge English: C2 Proficiency. It will give you a good understanding of the different grammatical structures commonly used in this part of the Use of English test, e.g. passive - active voice , impersonal passive, conditional sentences , inverted conditionals, inversions, set phrases, comparative-superlative, causative verbs, phrasal verbs, linking words, etc. If you want to learn how to do Key word transformation exercises effectively, this book is for you. D.Méndez