问：how much is、how much are、how many are三者的区别?

问：how much is、how much are、how many are三者的区别? How much is it和How much are these都是问价,有什么区别? How many,how ofen,how much,how long的区别 how.much和how.many的区别 how many和how much的区别 how many yuan are they?how much yuan are they how many和how much有什么区别?how are the stamps?空内应填什么? How much are they? how much are they how much ( ) are they how much are how much are these