This book has been designed to enable students to learn English by using English. In every chapter of this book you will find practical examples of English in use. Part one consists of twelve complementary chapters, each one dealing with a specific point in grammar designed to give the reader practice and confidence in twelve grammatical structures. At the end of each chapter there is a crossword to help you master new vocabulary by using the cross-referenced page numbers which enable you to look for the desired word with its definition, thus translating English to English. Every clue in the crosswords gives an indication to the number of letters in the word being searched for; (7) means, of course, seven letters. Also, at the conclusion of each chapter, there is a context-related exercise. In addition to the crosswords and exercises, each chapter has its own tip; learning these tips will help you to improve the language skills necessary to be fluent in English.
The key section includes not only answers to the gaps but also details the words' grammatical functions, other suggested possibilities, comments, examples, tips and reasons why such a form was chosen instead of a different one.
It is clear that the book may be used in many ways according to the circumstances of each case, the important point being that however you work it you will find, within the key section at the back of the book, all you need to test your work.
If, however, any doubt arises as to a particular word or structure, be sure that you write something before you consult the key, for while you must depend ultimately on the key for help, you must see to it that that help is legitimately worked for. You ought to make it an absolute rule never to consult the key until some version of a whole exercise has been attempted. However difficult the exercise, you can always at least write something. The mere experience of facing a problem prepares the mind to understand and enjoy the solution, whereas if every difficulty is dealt with by at once turning to the key to see how the exercise is done or which word is missing, little impression is made on the mind, and there is little real progress.