This ebook contains 50 Key Word Transformation exercises.These exercises test many of the different grammatical structures that students need to know in order to pass part 4 of the Use of English paper of the Cambridge English: Advanced (CAE) examination. In order to pass this task , students must be able to recognize what they are being tested on. For example, they need to know when they have to use the passive voice, a causative verb, modals of speculation, a conditional tense,etc. The exercises in this ebook test many of the different grammatical structures that students need to know in order to pass part 4 of the Use of English paper of the Cambridge English: Advanced (CAE) examination.