不定代词:凡不是用来指明代替任何特定名词的代词叫做不定代词。不定代词代替名词或形容词.在句中可用作主语,宾语，表语和定语。不定代词包括：

　　some, any, no, every

　　-thing: something, anything, nothing, everything

　　-one: someone, anyone, anything, everyone

　　-where: somewhere, anywhere, anywhere, everywhere

　　-body: somebody, anybody, nobody, everybody

　　例子：

　　1)Help! Somebody? Anybody?

　　2)Where did you go? I went nowhere.

　　3)Nobody is at home.

　　4)You are really something.

　　5)I looked for my book everywhere, but I cant find it anywhere.

　　6)If you want to go somewhere, if you want to be someone, you must wake up.

　　7)Since everybody is here, lets begin our class.