In another thread the question, What is worth living for? was asked. If you were to take the position that for was a prepostion in that question, how would you phrase it to avoid the dread violation of the rule up with which Winnie would not put? Note that I am not concerned with the question of whether for *is a prepostion in the question or the differences between prepostions and phrasal verb particles. Usually a sentence with a phrasal verb can be recast, however awkwardly, into a sentence that makes it look as though it were a prepostion, but I can't easily imagine one in this case. Any ideas?