Sometimes you're too busy with life - school, social life, jobs - to do this. That's where I come in - excellent at both UK and US English. I'm an English Language and Literature major in university and I do well in these subjects.
And articles - you have something written, but you're not sure of the grammar and syntax?
E-books - afraid it is all too jumbled? Too many or too little commas? Need paragraph structures and a proper layout?