MaizieD
It's not serious, though. Ending a sentence with a preposition isn't a crime against the English language. It was just a 'rule' invented by claassicists because Latin doesn't contain separate prepositions.
My English teacher, may she rest in peace!, told us when we were 13 or so, that Winston Churchill shared this point of view and on one occasion wrote in the margin of some convoluted piece of Civil Service English;
"this is the kind of language, up with which I will not put!"
I doubt it made any effect on the Civil Service, though.