不定代词是不指明代替任何特定名词或形容词的代词,英语中不定代词有:some(something,somebody,someone),any(anything,anybody,anyone),no(nothing,nobody,no one),every(everything,everybody,everyone),all,each,both,much,many,(a)little,(a)few,other(s),another,none,one,either,neither等.