English is a language spoken all around the world.
=English is a language which/that is spoken all around the world.
which/that除了可以引导定语从句,代替所修饰的名词langage,还在定语从句中担任主语,is spoken是定语从句中的被动语态.所以,过去分词在原句中作定语,修饰担任表语的a language.