This book has been written for students who have studied English intensively for up to six years. Its first aim is to correct the mistakes which even advanced students make, by demonstrating how native English writers use certain tricky structures, and giving the students practice in their correct usage. The second aim of the book is to improve the students' powers of self expression by expanding their vocabulary and repertoire of structures. The third aim is to stimulate the students to think about and criticise both the form and content of the passages chosen to illustrate the structures practised. [ From the blurb of the book, 1979 reprint ]