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This book is aimed at students of English as a foreign language at the B2 - C1 level. It provides explanations and exercises in all the essential grammar aspects at this level. There are several exercises on each grammatical point. Answers are given at the end of each unit, not only in the form of individual words or phrases but always in the original sentences, thereby providing valuable contextual clues. This book is ideal for students wishing to improve their grammar skills and for those who need additional practice before a test or an exam.