CCDMD.qc.ca : OTSEW (Online Tutoring System for Essay Writing) This site aims to help you to identify and use the components of English sentences and to improve writing skills. Each unit presents a theme with written explanations and colourful animations. Pre-tests, practice activities and quizzes help learners to evaluate their abilities and progress through interactive media. With reference tools including a basic grammar, glossary and printable PDFs.