Perfect Grammar: How to recognise, avoid, and correct grammar errors. Who else wants to make their writing sparkle? How often have you written something and not been sure if it is correct? Should you write ‘its’ ‘it’s’ or ‘it is’? Armed with this book, you will never make those errors again. This is an essential guide for students and teachers in post-16 education and for people in business. Communication is essential in any organisation and good grammar is the ‘oil’ that lubricates the flow of communication