Nearly everyone has trouble remembering the difference between 'affect' and 'effect', whether it's 'supposedly' or 'supposably', or which form of 'hear' you use in 'Hear, hear!' (Or is it 'Here, here!'?). Each word pair entry contains a straightforward explanation - complete with examples - to ensure (or is it 'insure'?) readers will be confidently choosing 'who' over 'whom' or 'uninterested' over 'disinterested' with ease. Alongside these usage notes will be fun tidbits including famous quotes, sample crossword entries, and the memory tricks "Grammar Girl" is known for.