This book classifies errors of the Elf and ESL students learning English as a second and foreign language and suggests remedial measures to overcome the committing of errors. This study provides the teachers with some insight into sources of errors. In addition, Knowledge of the types of students' errors in this study actually can help the teachers concentrate on the grammatical and composition rules necessary to understand and handle these errors. One of the major features of the book is to reveal the student of the problems in supplying the correct grammatical rules of sentences and composition in English and enable them to improve their language and use the target language flawlessly.