I was at a school yesterday waiting to see a teacher and watching another teacher edit a brochure that I assume is going out to parents. The phrase 'road show's' was used several times and each time she did not see the glaring mistake.
However, on telling my dh and dd2 about this it appears that neither of them are clear about the use of apostraphes. To make matters worse my dd is supposed to be a top set English student and says she has never been taught this (don't believe that). So I need a good, clear grammar book - can anyone recommend one?