Book excerpt: 230 Key Word Transformations is a collection of tasks designed to provide thorough training for Use of English Part 4 of the Cambridge C1 Advanced (CAE) exam. The tasks follow 25 units to ensure that candidates preparing for the exam have covered all the necessary language to pass. Key Features A step-by-step guide on how to do key word transformations. 17 tasks based on C1 level grammar. 6 tasks based on C1 level vocabulary. Answer key. This comprehensive collection of tasks provides extensive and practical training for Use of English Part 4 of the Cambridge C1 Advanced (CAE) exam. It is suitable for teachers in the classroom or learners of English as a self-study guide. Breakout English has been providing high-quality exam preparation materials to teachers and learners of English since 2018.