If the best advice you can glean from some grammar books is 'Be sure that a pronoun, a participial phrase or an appositive refers clearly to the proper subject', would it help you to improve your written English? I don't think so! When you just need to know whether to use 'practice' or 'practise', you don't want to be enmeshed in past participles, pluperfects or prepositional phrases – only to find that you don't understand the definition anyway. You need an easy-to-find, straightforward explanation and a clear example so that you can get the job done. This is not a book about theory; it's about learning how to use English correctly. It will show you what to do, when and why – so you can avoid the pitfalls, improve your English and never make the same mistakes twice. You'll find everything you really need to know – and nothing you don't! This is a totally indispensable book.