On the cover, the word “Shall” in the title has been crossed out and replaced with “Will”. That little device usefully gets the casual reader hot and ­bothered at the outset: when should you use “shall” and when “will”?Oliver Kamm’s advice is not to worry; use whichever you like, which means nowadays invariably using “will”. Yet I’m not sure that this doesn’t lose us a useful shade of meaning. When Cinderella’s godmother promises, “You shall go to the ball!” it wouldn’t sound quite so emphatic, so much of a promise, if it were a simple statement of fact: “You will go to the ball”. Not the end of the world, of course. Kamm’s targets are those “pedants” or