Do you often waste time looking up those confusing pairs of words like "affect"and "effect"? Or what about "ensure," "insure," or "assure"? Or maybe the sentence calls for "irritate," or should it be "aggravate"? This book includes 258 pairs of troublesome words, their definitions, and sentences that makes proper usage crystal clear. It's not a matter of misspelling with these word choices. As humorist Mark Twain once remarked, "The difference between the right word and the almost right word is the difference between lightning and the lightning bug." So don't look foolish in front of your colleagues! Get the grammar right, be clear, and save yourself some time.