Really Simple English Grammar (ESSENTIALS)

If you’ve ever tried to use a grammar book to look up something straightforward - such as when to use ‘that’ or ‘which’, or where to put the apostrophe when a word already ends in ‘s’ - you’ll know it’s virtually impossible to find what you want. Even the books supposedly designed for people with
no knowledge of grammar seem to use complicated jargon, and you need a natural ability for the subject and a desire to plough through endless paragraphs of complicated text just to pinpoint your problem.