The main purpose of English Grammar Exercises by Difficulty Series is to provide you a valuable and enlightening collection of English Grammar multiple-choice grammar exercises with answer key. This book contains different items sorted by difficulty and takes you on a beautiful journey towards improving your English language skills. Within this book you can find exercises regarding a multitude of topics like: word order, articles, verb tenses, active and passive voice, phrasal verbs, pronouns, adjectives, adverbs, relative clauses, prepositions, nouns, conditionals, reported speech, confusing words, word formation and many more&hellip;<br />There are three levels of difficulty in this book: Elementary, Intermediate, Advanced. Choose the best that suits you and enhance your English by solving the exercises.<br />This book is the first book of &ldquo;English Grammar Exercises by Difficulty&rdquo; series. It contains 2100 exercises with answers for all English levels: 700 for Elementary level, 700 for Intermediate level and 700 for Advanced level.