What is the primary purpose of key word transformations in the C1 Advanced exam?

The primary purpose of key word transformations in the C1 Advanced exam is to evaluate a candidate's ability to express the same idea using different words or structures. This focuses on a deeper understanding of language, as successful transformation requires not just vocabulary knowledge but also an understanding of meaning and context. Candidates must be able to convey the original thought accurately, demonstrating their proficiency in paraphrasing and their flexibility with language. This skill is crucial for effective communication, allowing speakers and writers to adapt their expression according to different contexts or to avoid repetition. It tests both comprehension and production of language, which are vital skills at the advanced level.