This book has been created specially to deal in detail with the common errors committed by the students and laymen in their writing and speech. It, being so comprehensive, may be used very profitably as a reference book both by the students and the teachers. It is primarily meant for the students to help them learn principles of everyday usage which often pose problems. It aims at giving the readers a proper and in-depth understanding of correct and good English which consists of spellings, usage, idioms, phrases, construction, punctuation, etc. The various chapters on common mistakes in this book are not presented in any graded order. Therefore, it is not necessary to study them in their given order. A careful and thorough study of these chapters is bound to help you considerably in avoiding common errors committed in everyday life. Students commit mistakes repeatedly, for they are not familiar with the norms of writing correct and good English. Correct writing is not an end in itself, but a means to better self-expression and social communication. Correct writing is not synonymous with writing, but the former certainly helps in the achievement of the latter. It is hoped that this Practical Guide to Common mistakes, with so much basic and functional solutions, will aid you in possessing better skills and improve language abilities without the help of the teacher.