As a non native English speaker and a former student in languages, I consider myself a pretty good speller. But I know that some people find English spelling really frightening. Unfortunately this is not a book for them.It is for people who master well enough the language and can make distinctions between various forms and spellings of English. Even those who think they are excellent at spelling, can still take a look at some of the exercises. You might find out that there are still words you don't know how to write them correctly.And for those of you who still have a long way to go to master the English language, get a good grammar book and don't worry too much: Virginia Woolf, Hemingway, Emily Dickinson had similar problems, just to name a few personalities.