GRAMMAR WORLD - BOOK- Ideal as a comprehensive grammar course, for reference, for self-study, for supplementary material, homework and revision. It includes: 112 units each of which focus on one area of grammar; one-page illustrated explanations written in simple English with clear explanations; abundant and varied exercises including illustrations to provide cues, storylines, recurring characters, and open exercises; review sections with a short summary and Cambridge PET-style questions; a grammar check with key to be used as an entrance or exit test; appendices for quick and easyreference.an answer key to the exercises is available separately.