凡不是用来指明代替任何特定名词的代词叫做不定代词.不定代词包括：
all ,both,every,each,either,neither,more,little,few,much,many,another,other,some,any ,one,no 以及some,something,anything,everything,somebody,someone,anybody,anyone,nothing ,nobody,no one,none,everybody,everyone.等.
所也它们是不定代词